Originally Posted by FarHorizon

So I've got a 60cm Klein Navigator that is just a bit too big. There's a 56cm one available on e-Bay. Too big a difference? The "best fit" bike I've owned measured exactly 58cm from center of cranks to center of top-tube.

The question is, how consistent is the sizing of frames? I know different manufacturers measure differently, so my "best fit" bike measurements may not match Klein's sizing even if I could get a 58cm Klein.

I think that I may just have to give up and insist on a test ride before buying, but if I can exchange my "just a bit too big" Klein 60cm frame for a smaller Klein via e-Bay, is the chance of a better fit worth gambling the postage amount?