Senior Member
Join Date: Feb 2006
Location: Sin City, Nevada
Posts: 2,885
Bikes: Catrike 700, Greenspeed GTO trike, , Linear LWB recumbent, Haluzak Horizon SWB recumbent, Balance 450 MTB, Cannondale SM800 Beast of the East
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+1 to being a masher. That's a great way to get sore knees. Try getting your friend to get back on the GTO and using lower gears. I own a 2001 GS GTO and never got sore knees in many thousands of miles over 9 years of riding it. I'm careful to use the right gear range to keep from stressing my knees. It may also be more the fact that it is hard to ride even a fine trike like this one when you start out until you develop the muscles it take to ride one. It could also be that he would rather be a couch potato.