If your short and using a 165 crankarm on your bike the longer crankarms on the spinning bikes could be the problem. My knees would bother me unless I warmed up for a good 1/2 hr. I finally decided that the longer crankarms were the cause of the problems so I bought a trainer for my bike and do my indoor riding on my own bike which is a lot safer for me. I also have PFS so my knees are very sensitive to change.



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