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never really looked into it much, just what i could figure out on my own, was wondering if someone could explain the differences/guidelines of the different racing classes. ie. supersport, supersport, xtreme formula, etc.
 

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check out: http://www.ama-cycle.org/rulebooks/

basically:

Supersport - 600cc minimal engine mods, suspension work (but original forks required, moded internals)

superstock - same as supersport, more or less, but on a 1000cc

formula extreme & superbike - more engine mods allowed, full replacement of suspension components (including forks), aftermarket brakes, wheels, etc.
 
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