Memorable rides (and some big rain) at the 2026 Australian Historic Road Racing Championship
CAPTION: Yes, it rained some. Photographer Graeme j Howie from Sport Pixx Sport Photography captured this great shot of Nichola Caddy and David Gardiner battling the wet conditions on their Honda CB750 outfit.
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DOMINANT performances by individual riders aboard some of history’s most memorable machines – mixed with some heavy rain to keep things interesting – were among the highlights of the 2026 Historic Road Racing Championship held at Collie, Western Australia.
Fresh from the Isle of Man, the Pete Lodge Norton ES2 lived up to its pre-championship hype, with New Zealander Scott Moir setting a lap record on the bike’s second lap of the Collie circuit. Moir and the remarkable Norton went on to win the Period 4 (1962-72) Senior class with a perfect four wins from four starts.
But Moir and the ES2 were not alone in their four-from-four clean-sweep result.
Eighteen-year-old West Australian Jayden Martin (Yamaha YZF-R6), fellow West Aussies Scott Topping (Triumph Trident), Adam Senior (Yamaha TZ750) and Paul Smith (Honda CB350), New South Welshman Keo Watson (Honda RS250), and Victorian Adam Donovan (Norton Manx 500) all pulled maximum points on their way to the top step on the podium in their respective classes. In addition to his championship crown, Martin posted a stunning 1:11.999 lap, lowering the previous Supersport lap record by almost three seconds.
The event provided a great showcase for historic road racing, with close racing aboard beautifully presented classic race bikes the order of the day.
Host club – the Historic Competition Racing Club of WA – provided the following comprehensive report.
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Group 1 – Period 4 & Period 5 Formula 750 Australian Historic Road Racing Championship (AHRRC)
Group 1, featuring the highly competitive Period 4 Formula 750 and Period 5 Formula 750 categories, produced close racing and championship battles throughout the meeting.
In the Period 4 Formula 750 class, Western Australia’s Scott Topping secured the Championship title with an impressive performance aboard Noddy’s Rob North Triumph 750, recording three race wins and a second-place finish across the weekend.
The fight for the remaining podium positions was intense, with just three points separating second through to fifth overall. Victorian rider Wayne Wilksch claimed second overall on his Honda CB750, while New Zealander Scott Moir completed the podium in third aboard the Pete Lodge Norton ES2. Western Australia’s John Slehofer, riding a Triumph T120, and New Zealand’s David Hamlin on a Honda CB500 remained firmly in the mix throughout the championship ensuring the battle for the minor placings went down to the final races.
In Period 5 Formula 750, Western Australia’s Glen Ottley emerged as Australian Champion after a dominant campaign on his Ducati TT 750, taking three race victories and a second-place finish. South Australia’s Tim Rutherford secured second overall aboard his Ducati Pantah 750, while fellow South Australian Danny Ahern rounded out the championship podium on his Ducati Pantah 500.
Victorian rider Darren McDonald was an early title contender and made an immediate statement by winning the opening race. However, mechanical issues struck at the worst possible time, preventing him from starting the final two races and ending his championship challenge prematurely.
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Group 2 – Period 7 Superbike (AHRRC)
The Period 7 Superbike class fielded a strong and competitive grid featuring a variety of machinery. All 13 riders were from Western Australia highlighting the State’s strong embrace of the newest era of historic motorcycle racing.
Jayden Martin (Yamaha YZF-R6) dominated the weekend, claiming all four race victories and securing the Australian title. His performance was particularly impressive given he arrived on Saturday morning fresh from Australian Superbike testing at Phillip Island.
Leigh Boujos (Yamaha YZF750) finished second overall with four consistent podium finishes, while Mark Ackermans (Aprilia RSV1000) took third after steadily improving throughout the weekend and becoming more competitive with each race.
The Kawasaki contingent of Callum O’Brien, Steve Martin, Dan Barson, Neil Howard and James Kelleher all showed strong pace. However each rider, for various reasons, dropped points in at least one race which ultimately proved costly in the fight for the overall placings.
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Group 3 – Period 2 Senior & Unlimited, Period 3 & 4 Lightweight (AHRRC)
The Period 2 Senior class, widely regarded as the most prestigious category of historic road racing delivered a fiercely contested championship battle across the four races.
Gary Ternardi (WA) and his Ariel VF 500 secured the National Championship with an impressive campaign of three race victories and one second-place finish. Consistency was key, allowing Ternardi to finish ahead of John Mattaboni (WA) aboard the Norton ES2, with Annie Hargrave (WA) and her Triumph 350 completing the championship podium in third.
Steven McQueen (WA), riding Rob Dillon’s Velocette MAC 350, showcased front-running pace with a race win and a second-place finish. However, two non-scoring races proved costly, leaving him fourth overall despite his strong performances.
Philip Briggs (WA) rounded out the top five on his BMW R51, finishing the meeting strongly with excellent results in the final two races to secure fifth place overall.
The Period 2 Unlimited category featured a Harley-Davidson contingent from the eastern states. Eddy Garner (VIC) dominated the class, claiming three victories and a second-place finish to take overall honours.
David Lomman (SA) finished second overall, while Bianca Bonner (VIC) completed the podium in third after a consistent series performance.
Period 3 & 4 Lightweight – Shaun Oliver (WA) and his Ducati Monza 250 proved unbeatable in the Period 3 & 4 Lightweight category, topping all four races with a combination of speed, reliability, and racecraft.
Fellow Western Australians Suellyn Luckett on the Ducati Narrowcase and David King aboard the Kawasaki Samurai enjoyed a competitive weekend, regularly mixing it with the front-runners and contributing to one of the meeting’s most entertaining fields.
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Group 4 – Period 6 & 7 Senior (AHRRC)
Period 6 Senior – A strong field of 14 riders lined up for the Period 6 Senior championship with Keo Watson (NSW) on Neil Robinson’s Honda RS250 proving an unbeatable combination throughout the weekend. Watson dominated proceedings, claiming victory in all four races and continuing a partnership that has enjoyed success for many years.
The battle for the remaining podium positions was fiercely contested. Youngster Leo Darling (WA) delivered an outstanding performance aboard the Tony Logan Honda CBR250RR, riding superbly to secure second place overall. Darling finished just two points clear of Justin Hindmarsh (WA), who piloted his Honda CBR400RR to third place in the championship standings.
Further down the order, Stephen Blount (WA), Glen Johnson (WA), Adam Donovan (VIC), Melanie Crockford (WA), Paul Jones (WA), Noel Heenan (VIC) and Damon Owen (WA) were locked in close battles throughout the weekend, providing plenty of entertaining racing.
Joshua Mathers (WA) showed impressive speed early, taking second place in Race 1, but an unfortunate crash brought an early end to what had looked like a very promising campaign.
The Period 7 Senior championship was claimed by HCMC legend Glen Ottley (WA) aboard his Honda RVF400. While Aaron Linham (WA) on the Kawasaki ZXR400 and Andrew McDonnell (SA) both enjoyed moments of success during the weekend, it was Ottley’s consistency across the races that ultimately proved decisive. By maintaining a strong points haul in every outing, Ottley secured the championship and added another impressive achievement to his distinguished racing career.
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Group 6 – Period 6 Formula 1300 (AHRRC)
Group 6 featured a strong field of 14 Period 6 Formula 1300 machines producing a hard-fought battle for championship honours.
Western Australia’s Marc Ackermans #105 opened the meeting in impressive fashion winning Race 1 aboard his Suzuki GSX-R1100. He finished ahead of Andrew Baker #333 on another GSX-R1100, with fellow West Australian Dan Barson #26 – GSX-R1100 completing the podium in third.
In Race 2, Barson reversed the Race 1 result getting the better of Baker, while Ackermans crossed the line in third place. The same order was repeated in Race 3, setting up a dramatic championship showdown in the final race.
With everything to play for in Race 4, Andrew Baker #333 delivered when it mattered most, taking the race win and securing the Australian Historic Road Racing Championship. Barson claimed second overall in the championship, while David Duffy #100 of South Australia secured third place overall aboard his Moto Guzzi Dr John Replica. Duffy’s consistency proved crucial as he finished just one point ahead of West Australian Will Croft #57 on his Ducati 900SS in the final race. Duffy, Croft and Ackermans ultimately ending the series on 61 points.
The championship concluded with an exceptionally close points battle, highlighting the depth of competition and the quality of racing throughout the Group 6 field.
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Group 7 – Period 6 250cc Production and Period 5 & 6 Ultra Lightweight 125cc
The Period 6 250cc Production class delivered close racing across four races. Race 1 was won by Neal Grey #78 (WA) aboard his Honda NSR250, ahead of Doug Harris #112 (WA) on a Suzuki RGV250, with Richard Langdon#117 (WA) finishing third on another RGV250.
Langdon fought back strongly in Race 2 taking victory ahead of Grey and Harris. He continued his winning form in Race 3, finishing ahead of Harris and rising youngster Leo Darling #32 (WA) on a Honda CBR250RR.
Race 4 saw a repeat of the Race 3 podium, with Langdon again claiming victory from Harris and Darling. The result secured Richard Langdon the Australian title, while Harris finished second overall. Darling’s consistent performances earned him third place in the championship. Adam Donovan #20 (Vic), riding a Honda CBR250RR kept the front-runners honest throughout the meeting and finished fourth overall.
Grey’s championship challenge faded when he failed to score points in the final race, dropping to fifth overall in the standings.
The Period 6 Ultra Lightweight category featured one of the closest championship battles of the event between Keo Watson #43 (NSW) and Scott Topping #171 (WA), both riding Honda RS125’s.
Watson ultimately claimed the Australian title by just two points from Topping. The decisive difference came in Race 1, where Lachie Williams #153 (WA) finished second ahead of Topping, providing Watson with the crucial advantage.
Williams’ strong performances throughout the meeting earned him third overall in the championship, ahead of Richard Reynolds #44 (WA), also aboard a Honda RS125.
The Period 5 Ultra Lightweight class was won by Brian Donovan #177 (Qld) on his Honda MT125R. Donovan was the only rider to complete all four races, securing overall honours in what marks the final chapter of a racing career spanning many decades. His consistency and determination were rewarded with a well-deserved championship victory.
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Group 8 – Period 5 Unlimited
The thundering machines of Group 8 Period 5 Unlimited delivered an unforgettable showdown with a mix of speed and consistency shaping the championship battle.
Leading from the front all weekend was Adam Senior #77 (WA) aboard the iconic Yamaha TZ750. In a dominant display, Senior claimed victory in all four races, leaving no doubt as to who would stand atop the championship podium.
Behind him the battle for the minor podium places was fierce. Andrew Baker #333 (WA) and his Suzuki GSX1100 put together a superbly consistent campaign recording two second-place finishes and two thirds. His ability to keep banking points across every race earned him a well-deserved second place overall in the championship standings.
Taking third overall was Neil Howard #24 (WA) Kawasaki Z1R whose steady performances paid dividends. Howard’s tally of two third-place finishes and two fourths demonstrated the value of consistency, allowing him to secure the final podium position after a hard-fought weekend.
Dan Barson #26 (WA) riding a Suzuki GSX1100 looked every bit a championship contender after claiming second place in the opening two races. Unfortunately racing can be cruel and a crash brought his challenge to an abrupt end just as the pressure was building on the front runners.
Tim Rutherford #18 (SA) impressed many aboard his Ducati Pantah 750. Improving with every outing, Rutherford steadily lowered his lap times and became increasingly competitive as the weekend progressed. Another few sessions of track time and he may well have been in the fight for the front positions.
Likewise, Will Croft #57 (WA) and his Ducati SS900 showed strong progression throughout the meeting. Each race saw increased confidence and pace.
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Group 9 – Sidecars (AHRRC)
What a weekend of racing for the sidecars with an outstanding field of seven Period 4 Unlimited outfits taking to the grid, joined by the local Hardwick brothers Steven and Mark aboard their Period 5 GSX1100 Suzuki.
Race 1 saw Nicola Caddy and David Gardiner (#14 Honda CB750) take the opening victory. John Mattaboni and Hamish Taylor (#62 Suzuki GT750) secured second, while third came down to a dramatic final-corner battle as Sarah Dillon and Steve McQueen (#242 Kawasaki H2 750) held off the charging father-and-son pairing of Dwayne and Damon Owen (#39 Honda CB750).
Race 2 belonged to Dillon/McQueen, crossing the line just one second ahead of the Owen outfit, with Mattaboni/Taylor again claiming third.
In the wet conditions of Race 3, Mattaboni/Taylor mastered the slippery track to take a convincing win. South Australian Geoff Grant and Victorian Andrew Lewis (#30 Kawasaki H2 750) finished second, ahead of Owen/Owen in third.
The final race on a drying circuit delivered the championship decider. Mattaboni/Taylor took yet another win to secure the Australian Championship. Caddy/Gardiner finished second, but a race two non-score proved costly in their overall campaign. Grant/Lewis claimed third in the race and enough points to land on the championship podium.
A fourth-place finish in the final race was enough for Dwayne and Damon Owen to secure second overall in the Australian Championship, just one point ahead of Grant/Lewis, who finished third.
Congratulations to all competitors for delivering an outstanding sidecar championship filled with close racing and a title fight that went right down to the wire.
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Group 10 – Period 7 Production Superbike (AHRRC)
The big, powerful machines of Period 7 Production Superbike were out in force at the AHRRC. Thirteen motorcycles representing five manufacturers and nine different models ridden by some of Western Australia’s most experienced road racers delivered one of the most memorable contests of the meeting.
Race 1 set the tone for the weekend. Leigh Boujos (#8 Yamaha YZF750) claimed victory by just 0.333 seconds over Callum O’Brien (#10 Kawasaki ZXR750R). The fight for the final podium position was equally intense, with Hayden Treversh (#18 Yamaha YZF-R1) holding off Steve Martin (#17 Kawasaki ZX-7R) by one and a half seconds. Martin Calley (#80 Yamaha YZF-R1) and Mark Ackermans (#105 Aprilia RSV1000) also launched their campaigns strongly with solid fifth and sixth-place finishes.
Race 2 saw O’Brien raise the pace and take victory ahead of Treversh and Boujos, who continued their close battle from the opening race. Martin, Calley, and Ackermans again finished fourth, fifth, and sixth respectively. Further back, Glen Johnson (#95 Honda CBR900RR) and Alistair Outen (#53 Suzuki TL1000S) crossed the line just one second apart in seventh and eighth positions.
Race 3 will long be remembered for the outstanding performances of every rider in treacherous conditions. Heavy rain turned the circuit into what looked more like a flowing stream than a racetrack. Watching the riders wrestle the meeting’s most powerful motorcycles through such conditions was a spectacular sight taking spectators back to the 500cc Grand Prix era where even the slightest mistake carried serious consequences.
Boujos demonstrated all of his experience to take a memorable victory ahead of the ever consistent Treversh. Calley edged out O’Brien for third place, while Ackermans somehow guided his Aprilia home despite running on slick tyres. Rumours circulated that he may have pushed the bike around parts of the circuit as he has reportedly done in the past. Regardless, the points he earned would prove crucial in the championship standings.
The final race on Monday, run in dry conditions saw Treversh find another level of speed to take an impressive victory. It must have been sweet after a lengthy period away from competition. Boujos finished second, while Martin secured third to cap off a strong weekend. Ackermans claimed fourth place, while unfortunate DNFs for Calley, Outen, and O’Brien would have a significant impact on the final championship positions.
Ultimately, the weekend belonged to Boujos, whose consistency and pace earned him a well deserved Australian Championship. Treversh finished just five points behind in second and with one race dropped due to conditions and time constraints the title fight could have gone right down to the wire. Ackermans secured third overall by a single point over O’Brien, with his remarkable wet-weather performance and O’Brien’s unfortunate final-race DNF proving decisive in the final standings.
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Group 11 – Period 3 Senior & Period 4 Junior (AHRRC)
Victorian rider Adam Donovan was simply untouchable aboard his stunning Norton Manx 500 in Period 3 Senior, claiming a flawless four wins from four starts to comfortably secure the Australian Championship crown.
While Donovan controlled the front of the field, the fight for the remaining podium positions was intense. Martin Baldwin (WA) aboard the Norton ESO 500, Alex Kennedy (WA) on the BSA Goldstar, Greg Kennedy (SA) with the Matchless G80, and Glenn Baldwin (WA) on the Matchless G50 all featured strongly throughout the weekend each recording a second-place finish.
A number of riders were hampered by non-scoring races which proved costly in the championship standings. Only three competitors managed to complete all four races and finish on the overall podium.
Consistency ultimately paid dividends for Alex Kennedy, who secured second place in the championship, finishing 28 points behind newly crowned Australian Champion Donovan. Benjamin Versteegh (SA) rode his Velocette MSS500 with impressive reliability and consistency to claim third overall.
Period 4 Junior
The Period 4 Junior class belonged to Paul Smith (WA) and his highly capable Honda CB350. Smith completed a clean sweep of the weekend with rider and machine appearing perfectly in sync throughout the meeting.
Lauchy Williams (WA) adapted quickly to a new motorcycle and delivered a superb performance aboard the Yamaha TR3, securing second overall. Finishing third was Mark Ackermans (WA), who impressed by jumping straight from a superbike onto a Honda CB350 and immediately finding competitive pace.
Strong individual race performances from fellow CB350 riders Shaun Oliver (WA) and Dan Barson (WA) highlighted the depth of the class, while an unfortunate weekend for club front-runner Tony Logan aboard his Honda Drixton 350 prevented him from challenging for the higher championship positions after a second place in race 1.
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Group 12 – Period 4 Unlimited (AHRRC)
Scott Topping #171 (WA) aboard Noddy’s Rob North Triumph Trident delivered a dominant performance completing a clean sweep of all four races to secure another Australian title.
In Race 1, Clive Hughes #196 (VIC) on a Honda CB750 claimed second place ahead of Simon Cook #40 (SA), also riding a Honda CB750. Nick Miller #61 (WA) enjoyed a strong opening outing on his Rob North Rocket 3, finishing fourth, while Wayne Wilksch (VIC) brought his Honda CR750 home in fifth. Unfortunately, Steve Martin #17 (WA), riding Roger Middlebrook’s Rob North Norton, recorded a DNF.
Race 2 again went the way of Topping who won by a comfortable margin. Hughes was disqualified allowing Cook to move into second place, with Miller finishing third.
By Race 3 Topping had firmly established himself as the rider to beat. Martin had the Rob North Norton performing strongly and finished second ahead of Cook, Miller and Wilksch. Hughes was a non-starter and after the promise shown with his second-place finish in Race 1 his championship challenge was effectively over.
The final race finished in the same order. Martin continued to find more speed and was left wondering what might have been after his earlier misfortune. Behind him Cook and Miller staged a close battle, with Cook crossing the line just one second ahead to round out an entertaining championship contest featuring some spectacular machinery.
Topping’s flawless weekend added yet another Australian title to his growing collection. The ever consistent Cook secured second overall finishing five points clear of Miller in third.
Also featured was the sole Period 3 Unlimited entry of Benjamin Versteegh #179 (SA) on a Velocette MSS500. Versteegh relished the opportunity to dice with the Period 4 machinery throughout the meeting.
Unfortunately, Frank Ashman (QLD) was unable to take the start on his Period 3 700cc pushrod BSA A65 Star.
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Group 13 – Period 4 and Period 5 Senior (AHRRC)
The senior races produced some spectacular action.
Race 1, Period 4 Senior: New Zealand’s Scott Moir took victory aboard the Pete Lodge Norton ES2 fresh from a podium finish at the Isle of Man Classic TT. Remarkably, Moir set a new lap record on just the machine’s second full lap of the Collie circuit. Western Australia’s Paul Smith delivered an outstanding performance to finish second on his beautifully tuned Honda CB350, circulating at the previous lap record pace despite giving away capacity to some of his rivals. Fellow WA rider Shaun Oliver completed the podium on another Honda CB350, while David Hamlin (NZ) brought his newly restored Honda CB500 home in fourth during its first competitive outing.
In Period 5, Adam Senior (WA) dominated aboard his spectacular Suzuki RG500, comfortably winning the class. However, the on-track battle between Senior, Moir and Smith provided one of the highlights of the meeting. Queensland’s Ronald Funk secured second place on his trusty Honda CB500, narrowly ahead of Stephen Lloyd-Cox (WA) on a Yamaha SR500. Martin Baldwin (WA) was fourth on another SR500, while Danny Ahern (SA) rounded out the top five on his Ducati Pantah 500.
The rain arrived for Race 2 compressing the field and producing some exceptionally close racing. In Period 4 the finishing order remained unchanged, with Moir defeating Smith, Oliver and Hamlin once again. The margin between Moir and Smith was an incredibly tight 0.162 seconds, highlighting just how hard Smith pushed throughout the wet conditions.
In Period 5, the podium positions again remained unchanged, with Senior taking the win ahead of Funk, Lloyd-Cox and Baldwin. Emerging young talent Rossi McAdam (WA) impressed aboard a Honda CB400, finishing fifth.
Race 3 – With the track damp but improving, Moir continued his winning form in Period 4, establishing a comfortable advantage and controlling the race to the finish ahead of Smith, Oliver and Hamlin.
In Period 5, the familiar trio of Senior, Funk and Lloyd-Cox once again filled the podium positions. Ahern improved to fourth, ahead of Baldwin, while Jordan Sceresini (WA) brought his Yamaha SR500 home in sixth.
Race 4 was now dry conditions returned for the final race of the weekend. In Period 4, Moir completed a perfect meeting taking his fourth consecutive victory ahead of Smith, Oliver and Hamlin.
In Period 5, Senior also maintained his unbeaten record, claiming a fourth straight win. Funk was again second, with Lloyd-Cox completing the podium.
Championship Results
Period 4 Championship: Scott Moir secured the Period 4 championship after winning every race. While the results suggest dominance, Paul Smith’s challenge throughout the weekend was exceptional and earned him a well deserved second place overall. Shaun Oliver completed the championship podium in third and can be justifiably proud of his performance, beaten only by the legendary Norton ES2 and local racing stalwart Paul Smith.
Period 5 Championship: Adam Senior claimed the Period 5 title aboard the magnificent Suzuki RG500, ahead of Ronald Funk in second and Stephen Lloyd-Cox in third.
The consistency shown by Martin Baldwin (4th), Danny Ahern (5th), Maya Schonberger (WA) (6th) and Philip Young (WA) (7th) rounded out the championship standings.
It was an unfortunate meeting for Rob Marriner (NSW) on his Honda CB500 and Colin Meredith (QLD) on his Ducati Pantah, with both riders struck by mechanical problems that prevented them from showing their full potential over the weekend.
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Group 14 – Period 6 Formula 750 & Period 7 Supersport (AHRRC)
Despite a heavily depleted field due to mechanical issues and crashes in the lead-up to racing, Group 14 competitors produced some outstanding performances across the weekend.
Race 1: With nine non-starters and two non-finishers the opening race saw a reduced field take to the track. At the front of Supersport, Jayden Martin (#85 Yamaha R6) wasted no time finding his pace, taking victory by almost 17 seconds.
Dan Barson (#26 Kawasaki ZX-6R) finished second, while Stephen Blount (#132 Honda CBR600), who stepped in at late notice for Barry Hickey, completed the podium. Glen Johnson (#95 Honda CBR600) claimed fourth ahead of South Australian Andrew McDonnell (Ducati 400SS).
In Formula 750, Colin Reynolds (#18 Suzuki GSX-R750) and Rod Baker (#13 Suzuki GSX-R750) enjoyed largely unchallenged rides, with six non-starters recorded in the class.
Race 2: A wet track greeted competitors for Race 2 but Martin again proved untouchable in Supersport, taking another convincing victory. Blount finished second ahead of Barson, Johnson and McDonnell. Formula 750 delivered a much closer contest, with Reynolds and Baker battling throughout the race before Baker emerged victorious.
Race 3: On a drying circuit, Martin continued his dominance leading from the front to secure another win. Blount held onto second after withstanding pressure from the ever-improving Johnson, who claimed third place. Unfortunately the fast challenger Dan Barson was unable to start after suffering a crash in another race.
Race 4: Dry conditions for Monday’s final race allowed Martin to showcase his full potential. On lap two, he recorded a stunning 1:11.999, lowering the previous Supersport lap record held by Blount by almost three seconds and finishing only fractions away from the outright Historic Motorcycle lap record held by Josh Mathers. Blount again secured second place, while Johnson completed the podium. James Kelleher (#218 Kawasaki ZX-6R) finished fourth.
In Formula 750, Reynolds returned to the top step of the podium, defeating Baker to secure the class victory.
Final standings, Period 7 Supersport
Jayden Martin 
Stephen Blount
Glen Johnson
Andrew McDonnell
Period 6 Formula 750
Colin Reynolds
Rod Baker
Martin’s clean sweep of the Supersport races highlighted by his record-breaking lap was one of the many standout performances of the meeting.
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UNDERSTANDING THE CLASSES
In Australian historic road racing championships, motorcycles are divided into chronological “Periods” based on their year of manufacture, alongside specific engine capacity and sidecar classes.
| Period / Category | Year Range | Description |
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| Period 1 (Veteran) | Up to 1919 | Earliest pioneer and veteran motorcycling machines. |
| Period 2 (Vintage) | 1920–1945 | Pre-war and vintage era machines. |
| Period 3 (Classic) | 1946–1962 (or 1963) | Classic solo and sidecar machines like Norton, Triumph, and BSA. |
| Period 4 (Post Classic) | 1963–1972 | Post-classic transition and early lightweight/heavyweight racing. |
| Period 5 (Forgotten Era) | 1973–1982 | Dominated by early Superbikes and Japanese/European multi-cylinder engines. |
| Period 6 (New Era) | 1983–1990 | 750–1000cc Superbikes, 250cc production 2-strokes, and GP bikes. |
| Period 7 (Pre-Modern) | 1991–1999 | Later 1990s sports bikes introduced to expand historic grids. |
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