Hi,
Why do people constantly say that riding a fixed-gear bicycle without brakes (fixed-gear riding with brakes can be very benificial for knee health) is bad for your knees.
The majority of people who ride fixies do it for fun - countless skids and bunny-hops, most of the time without proper foot retention - not to mention alot of those riders are running gear ratios over 75 GI without brakes. Riding like that will cause problems, but if you run a low gear ratio, have a correctly fitted bike with proper foot retention, and avoid excessive skidding and hard backpedalling - then surely you wouldn't run into the knee trouble unless knee problems are common in your family.
Riding fixed does put more strain on your knees, but running also puts strain on your knees and many people have been running for decades, so why do so many people write fixed-gear off as being bad for your joint health?
Cheers