Le Mans 24H Moto: Rules and Regs

Posted: 18th April 2018

Making sense of the rules - Formula EWC: Endurance specials modified for quick pitstops and more speed – Superstock: Close to standard bikes with no endurance mods or engine tuning – Experimental: Funny front ends, hybrid or electric power, what have you got? ...

A few days back the Le Mans circuit issued a guide to the difference between the classes of bike that will be racing at Le Mans and how to spot them. They missed the big difference, though, so we've tried to set the record straight.

Formula EWC bikes can have some mild engine tuning, but crucially can have their wheels and brakes modified to facilitate quick pitstops. Superstock bikes run standard engines, and more significantly standard wheel and brake mounting systems. The difference in pit stop times between these two classes is enormous and is the reason why the Formula EWC bikes always bubble up to the top of the leaderboard as the race goes on.

LMS72: Superstock pitstops are slowed down by barke caliper removal

In researching this article, we also notices that the Experimental class – normall the home of the Funny Front End tinkerers - can now run either hybrid electric / internal combustion engines, or fully electric power systems. Who will be the first to enter a KERS bike at a 24 hour race?

Black number-board, modified brakes and wheel fixings; Formula EWC Rac41

Formula EWC

  • Black number-boards, white headlights
  • 175kg minimum weight
  • Three or four cylinder engines up to 1000cc, twin cylinder engines up to 1200cc
  • Frame can be strengthened, suspension must be the same type as homologated.
  • Wheels fitting systems and brakes can be modified or changed for faster pitstops.
  • Fuel system can be re-programmed but must use homolgated parts.
  • Cylinder head can be ported, compression ratio can be increased, valves must be as homologated
  • Cams and the cam drive system can be changed.
  • Internal gear ratios can all be changed
  • Can use 45 tyres per 24 hour event, plus full wets.


  • Red number-boards, yellow headlights
  • 168kg minimum weight
  • Three or four cylinder engines up to 1000cc, twin cylinder engines up to 1200cc
  • No changes to fuel system.
  • No changes to frame, other than rear subframe.
  • No changes to the wheel axles or mounting system, or brake caliper fixing method
  • Fuel system must remain standard
  • No modifications to the cylinder head or cams
  • No modifications to the gearbox.
  • The ECU may be changed
  • Can use 27 tyres per 24 hour event, plus full wets.

    Red number-board is the SuperstockLMS72, green number-board is the Experimental class Metisse


  • Green number-boards, yellow headlights.
  • 165kg minimum weight
  • Four cylinder engines up to 1000cc, twin cylinder engines up to 1200cc
  • Engines can be naturally aspirated internal combustion motors, or hybrid systems with an alternative energy source in combination with an internal combustion engine of up to 400cc, or "Other: i.e. electric”.
  • The Experimental class is an event specific class, and there will only be a podium ceremony if at least three machines are entered in this class.

    Download the Rule Book here: fim-ewc-rules-1718.pdf
    Access the latest, up to date FIM EWC Regulations here: www.fim-live.com/en/sport/regulations-and-documents/endurance/

    Words, Photos: Martin Gelder