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Seeing as I did the research for a different discussion, might as well share. This is what other racing orgs are doing that I'm aware of:
WERA - E Superstock - 250 Twins, 250 Singles, slightly more restrictive than LRRS SuperSport. Wheels may be swapped to 17s but they have to weigh as much or MORE than the OEM wheels.
CMRA - E Superstock - EX250, VTR250, CBR250R, Buell Blast. Basically WERA Superstock rules, plus open airbox mods, absolutely no engine mods.
CCS - Ultralight Thunderbike - Singles up to 300cc with no restrictions on frame or engine, Twin cylinder air cooled up to 350cc, liquid cooled twins up to 300cc. RS125 and MD250 excluded as complete units, use of their engines however is legal in another chassis. Note, none of the regions with active racers in the class are going by this rule structure, they're all operating under a gentlemen's agreement to go by CCS SuperStock rules. Last year's ROC winner in ULTB was on a SuperStock legal Ninja 250. http://specclassracing.com/ https://www.facebook.com/specclassracing
CSBK - Honda CBR250R Cup - CBR250Rs only, SuperStock plus mandated DynoJet PowerCommander, bikes are randomly weighed and dyno'd to enforce compliance.
WMRC - 250 Gold Cup - 2008 and up Ninja 250, 2011 and up CBR250R only, SuperStock rules with Dyno verification.
WMRC - 250 Supersport - 250cc fourstrokes only, slightly more restrictive than CCS SuperSport rules.