Sidecar racing will return to the Isle of Man TT in 2027 after organizers suspended the entire class following terrifying crashes during qualifying at this year’s event.
The TT confirmed a three-year commitment to the category through 2029, but only with a complete overhaul of the technical regulations that have governed the sport for decades.
The biggest shift is the end of the 600cc four-cylinder engine formula. Production-derived middleweight engines from bikes like the Yamaha R7, Aprilia RS660, and Kawasaki Ninja 650 will take its place, aligning the class with British Sportbike regulations.
Controlled Performance
A Mectronik control ECU gives the TT Technical Director the ability to manage the performance envelope of the field. A Balance of Performance approach aims to close the gap between well-funded teams and privateers.
Under the old formula, heavy engine development spending created substantial performance advantages. The new rules are designed to reduce that gap and put more emphasis on chassis setup, preparation, and the skill of the driver and passenger.
Existing chassis designs remain eligible, so teams don’t need to start from scratch. But separate wings, aerofoils, fins, and spoilers are now banned. Bodywork rules get tighter limits on floors, undertrays, and wheel arches to reduce aero development and improve access for medical personnel.
Each of the two sidecar races in 2027 will cover just two laps of the Mountain Course. Race distances for 2028 and 2029 will be reviewed after the first year of the new formula.
Competitor eligibility also tightens. Riders must show recent competitive activity, medical fitness, and demonstrated readiness for the demands of the Mountain Course.
Paul Phillips, the TT’s Head of Motorsport, said that “simply returning to the previous formula was never going to be the right answer.”
A Smarter Engine Formula
The 600cc supersport platform has been fading from production lineups for years. Basing the new regulations on modern middleweight engines that manufacturers actually build and sell gives the class a more sustainable foundation. I think that is a smarter bet than clinging to a dying formula.
Sidecar racing has been part of the TT since 1923, as anyone who has followed sidecar competition knows. It nearly disappeared from the Mountain Course this year. These changes give it a genuine path forward.
