FIM releases details on new class to replace 250 GP
To be introduced in 2011December 12, 2008
Technical details on the replacement class for 250 GP in the Road Racing World Championship have finally been announced by the FIM.
Due to be introduced in 2011, the class will allow four-stroke engines to a maximum of 600cc, with a rev limit of 16,000rpm for four-cylinders, dropping to 15,500 for triples and 15,000 for twins.
Throttle body size will also be limited, up to a maximum of 59mm for twins, and a there will be a clause on the number of gear ratios permitted -- which will have to be declared at the start of the season.
Components such as valve springs, connecting rods, camshafts and brake discs must be made from iron-based alloys (ie no "non-conventional" materials), while pistons will be aluminium-alloy.
In concert with the premier MotoGP class, chassis will be prototype, and the frame, swingarm, fuel tank, seat and cowling cannot be sourced from a production, road-going motorcycle. Total minimum weight will be 125kg for twins, 130kg for triples and 135kg for fours.
The new class doesn't have a name, as yet.
For a copy of the regulations, click here.
The two-stroke 250 GP class has been held continuously since 1949, and was won this year by Italian Marco Simoncelli on an Aprilia.
As it stands, Aprilia will be the only manufacturer maintaining a factory presence in 250 GP next year, as KTM has already withdrawn its team to concentrate on the only two-stroke class which will remain the world championship after 2010 - 125 GP.
Pic: the KTm 250 GP machine. Credit: Kirn F
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