I found a 24 w\7 ( yes I only run 21 speed ) and i'm gonna try the little wheel adj- I put a smaller tire on my rear for something- oh ya -it seems to give me a bit more launch-power to the tire.? like 2.10 front 1.95 rear- it does make it feel dif? 20-26 is crazy- cool if it's a street cruiser.