Regarding using 2 different bikes on rollers, they would need to have close to the same wheelbase to use the rollers without adjustment. Your front axle must sit over the front roller, which is adjustable in length. It doesn't have to be exact but maybe within an inch. If you plan to use rollers, you have to commit to some learning time and keep at it enough to feel comfortable. I have a set that I rarely use (the trainer is just easier and less scary) and even when I used them fairly regularly, was never super comfortable on them. Someone on this board recently got some e-motion rollers (search for thread) which have side bumpers and other stabilizing features.



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