For racing I ride a set of Zipp 404s. The problem is that my gearing gets screwed up when I switch from my training wheels to my race wheels. When my race wheels are on I can't hit the smallest gear on the rear cog and the chain will almost get thrown into the spokes if I shift down to the largest. So I usually get my bike tuned with my race wheels so I have no problem at the races, but then I always have to ride my race wheels because when I put my training wheels back on I throw the chain off the small ring into the frame. Is there a spacer or something I can buy that will fix this problem? Or quick adjustment (free, instead of having to go to the shop) to make when swapping the wheels out?

Any recommendations would be helpful...hopefully I haven't confused you to much about the situation, but it's crazy annoying.

Thanks for your help.