Originally Posted by
DaveSSS
Trainers that clamp against a skewer can misalign the RD, such that it does not shift the same as normal. If you understand how to adjust the RD, increasing or decreasing the cable tension may help, but of course you need to put the tnesion back where it was when you hit the road.
Ah, that makes sense. I do know how to adjust my RD, so that's what I'll try. Thanks. I can see how having a dedicated trainer bike would be a good thing.