Originally Posted by dikman

I'm 39. Riding fixed (77.6 gear inches, brakes) daily about 100km per week. My commute involve 3 climbing hills with 5% and 7% grades. Have knee problems, quit running about 2y ago. Still, after serious hike or ski tour trip I barely can walk, but never have problem riding. I have a road bike as well and do not see any difference between geared and fixed in terms of knee problems.