are you shure the wheel is slipping? maybe its the chain stretching. I though
my wheel was slipping until I tried a new chain. I was using a miche track chain
but when I changed gearing I had to get a new one. the guy in the bike shop
shopwed me the miche and one of the cheaper Izumi chains. without knowing
about my chain slacking problem he mentioned that the miche tends to stretch
faster so I tried the Izumi. I have had it for weeks now and havent readjusted the
wheel since.