I never used to get knee pain, and I was running a heavy, heavy old bike at 108GI. Then I bought a not-light Charge running at 69GI, still no knee pain. I flipped the rear wheel so I could be one of those trendy fixie skidder types about 4 months ago - suddenly, knee pain for the first time.
Tim's Totally Unscientific* Opinion:
My knees** don't seem to like the rapid cycling during descents that I used to avoid by running single-speed.
*This is based purely upon coincidence.
**I am only suggesting this applies to my own knees, not everyone else's.
I never used to get knee pain, and I was running a heavy, heavy old bike at 108GI. Then I bought a not-light Charge running at 69GI, still no knee pain. I flipped the rear wheel so I could be one of those trendy fixie skidder types about 4 months ago - suddenly, knee pain for the first time.
Tim's Totally Unscientific* Opinion:
My knees** don't seem to like the rapid cycling during descents that I used to avoid by running single-speed.
*This is based purely upon coincidence.
**I am only suggesting this applies to my own knees, not everyone else's.