21mm yellow mini spikes will work the best and be the quickest, use them with foam inserts. They will wear out the quickest as well, at our hall you get 2-3 weeks from one set with a stock motor, if your silly and have a very heavy thumb some people go through a set a night almost. Wear rate really depends on the venue, other clubs get 6+ weeks from a set.
25mm wide yellow mini spikes work really well and last alot longer, 7-8 weeks at our club but are about one lap slower than the 21mm. The 21mm are a little bit more nimble and have more grip but with the 25mm you enter the corners too quickly, scrub the speed of and still make it round. Rebelrc's setup advice is a good starting point.
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