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@jonaent_(Jon)
Wayne, have you thought about blood flow to your feet?
no-one's commented on my above coment! do you believe its possible to ride fixed, a lot, with a single or no brake, and still come away with happy knees?[/quote]
Yes, if u are fit and healthy and not overweight, and are doing similar amounts of miles over long periods of time then you'll be fine. It's like saying if load boxes onto a truck all day will my arms be fucked forever?... No. Purely repetative acts are not a catalyst for physical problems.... you must have a underlying weakness in the first place.... i.e. your knee/arm/back etc. muscles are weaker, or prone to damage when stressed.... hence why you can damage them after short powerful sprints. At the end of the day muscles are designed to tear and re-build as one repeats acts.
That's why some peoples knees hurt and other peoples knees don't.