Hello. My wife and I got a user Keiser M3 some time ago. We're quite happy with it, find it a great way to train in the off-season etc. I've wondered for some time, and have recently confirmed, that the cranks are shorter on the Keiser than on both my wife's and my own mountain bikes. For reasons I won't get into, we spend far more time on mountain bikes than road bikes.

My question is this: is it possible to get longer crankshafts for the Keiser M3? A relatively cursory search indicates that it might now be. But perhaps there's some type of aftermarket workaround. Any and all help would be much appreciated. If it is helpful to measure actual lengths of what I have vs. what I would like in a perfect world I can do that.

Thanks in advance,