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Old 2002-11-09, 06:53 AM   #3
ONE for the...Off Road
teachndad's Avatar
Join Date: Jul 2001
Location: West San Fernando Valley, Southern California
Posts: 1,086

I recently reinjured my knees from an overuse injury that I had over 20 years ago. I don't know what the knee injury is called, so I don't know how relevant it would be for your situation.

But anyway, I was riding 170mm cranks on my MUni with a 24 x 3.0 gazz. The length of those cranks bent my knee too much at the top of the pedal rotation, so I put on some MOnty 158mm cranks. This lessoned the angle of the knee at the top of the rotation and allowed me to raise the seat. All of which reduced that angle.

With 150's, they are still pretty short, so I don't think the range of motion at the top of the pedal rotation will be an issue for you as long as your seat is high enough.

However, you will run into a bit of a conundrum if you start riding steeper hills. The 150's will be too short for adequate torque, which then puts more stress on the knee. If you get longer cranks, you can have the problem of the knee bending too much at the top of the rotation. damned if you do damned if you don't.

My advice would be to go with the 150's, make sure you're seat height is correct and maybe go a little higher. Ride around on gradual hills for a while and then see how it goes. Then gradually go to steeper stuff. Take it slow and do it over a period of time, so you can tell when to keep going or pull back.

150mm cranks are pretty cheap. I had the Bicycle Euro 150's on my Sem XLW for a while and they held up well. They run @25 bucks. So you won't loose out financially on experimenting with them.

Hope that helps.
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