Which machines you can ride in each Manx Grand Prix race, summarised from the technical regulations so you do not have to hunt through the full document.
The regulations are the authority
Summarised from the 2026 Classic TT / Manx Grand Prix Technical Regulations, checked on 31 July 2026. They may be amended by Bulletin during the season — always check the full document before building or entering a machine.
Regulations & documents
Senior MGP & Supersport MGP
Supersport specification
Both races run to the MGP Supersport technical regulations. A model stays eligible for ten years from FIM homologation.
Engine configurations and capacities
| Engine | Capacity |
|---|
| 4 cylinder, 4-stroke | over 400cc up to 600cc |
| 4 cylinder, 4-stroke | over 600cc up to 636cc |
| 3 cylinder, 4-stroke | over 500cc up to 675cc |
| 2 cylinder, 4-stroke | over 600cc up to 750cc |
- Capacity must stay at the homologated size — changing bore or stroke to reach a class limit is not allowed.
- A machine outside these classifications may be considered on application, and if approved is a Supersport Next Generation machine. It must have a ride-by-wire throttle, and the VIN, ECU number and firmware must be declared on the entry.
- A full rolling chassis from a Kawasaki ZX-6R 600 may use the engine, throttle bodies and air box from the 636, homologated from the 2019 Ninja ZX-6R (636cc) or later. A lower rev limit applies.
- Machines that fall outside the ten-year homologation window may apply for special dispensation.
Number platesBlue numbers on white plates
Junior MGP & Sportbike MGP
Sportbike or Supertwin specification
For 2026, Supertwin machines may compete in the Sportbike class. You may enter to either specification — but whichever you choose, all of that specification applies.
Sportbike — minimum weights
| Machine | Minimum weight |
|---|
| Aprilia RS 660 | 158 kg |
| CF Moto 675SR-R | 160 kg |
| Kawasaki Ninja 650 | 156 kg |
| Kawasaki ZX4R (&RR) | tbc |
| Kove 450RR Pro | 141 kg |
| Suzuki GSX-8R | 169 kg |
| Triumph Daytona 660 | 165 kg |
| Yamaha YZF-R7 | 158 kg |
Eligible Supertwin machines
| Make and model | Capacity | Bore & stroke |
|---|
| Kawasaki Ninja 650 | 649cc | 83.0 × 60.0 mm |
| Kawasaki Z650 | 649cc | 83.0 × 60.0 mm |
| Kawasaki ER-6F | 649cc | 83.0 × 60.0 mm |
| Yamaha MT-07 | 689cc | 80.0 × 68.6 mm |
| Yamaha R-7 | 689cc | 80.0 × 68.6 mm |
| Patton S1-R 650 | 649cc | 83.0 × 60.0 mm |
| Suzuki SV650 | 645cc | 81.0 × 62.6 mm |
| Aprilia RS660 | 659cc | 81.0 × 63.9 mm |
- Sportbike machines need the relevant FIM or MCRCB homologation, must be normally aspirated, and must make approximately 70kW (95PS) with a ride-by-wire throttle.
- Supertwin: any four-stroke, water-cooled twin up to 700cc, sold to the public for road use and type-approved from 2012 or later. Serial production only — no one-offs or prototypes — with at least 30 units built.
- The Aprilia RS 660 and Yamaha YZF-R7 may be run as either Sportbike or Supertwin. Declare which, and that specification then applies in full.
- All Supertwins have a minimum weight of 150 kg.
Number platesWhite numbers on red plates
