A front pair saved a whole 1KG over stock and the rear saved another 700 grams off the top of my head. Also remember it is rotating mass so the saving has even more benefit at high speed.

I sold a pair to a club racer and he said he was running over the inside curbs until he got used to the new turn in speed.

I'll have a look around.
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http://www.rgv250.co.uk
http://www.thetuningworks.com