Originally Posted by
Iride01
Check the geometries between the two bikes. Seat tube angle changes between some sizes depending on brand and model. So your butt might be in a different position over the BB when your reach from saddle to bars/hoods and everything else is the same.
Though it might not be significant enough to even be an issue for you depending on how fussy you are about your fit.
Yes. But I wouldn't settle for a class B fit. I'd go out and buy the seatpost with offset that allows the proper seat location. That and the stem to get the proper BB to bars reach and height and this bike will serve you very well. (Until your wife scares you with "Dinner's ready", you slip off the pedals and seat, nail that high top tube (higher now that you've got a block under the front wheel), you receive irreversible damage and your marriage is never the same. Might be wise to orient the trainer so you can see her walk in.
)