these might be helpful ( previous threads on knee problems )
http://www.londonfgss.com/discussion/1214/is-fixed-bad-for-your-knees-if-you-dont-skid-ride-high-gear/#Item_0 http://www.londonfgss.com/discussion/1476/2/knees/#Item_16 http://www.londonfgss.com/discussion/3947/a-right-pain-in-the-knee/#Item_4
@sol started
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these might be helpful ( previous threads on knee problems )
http://www.londonfgss.com/discussion/1214/is-fixed-bad-for-your-knees-if-you-dont-skid-ride-high-gear/#Item_0
http://www.londonfgss.com/discussion/1476/2/knees/#Item_16
http://www.londonfgss.com/discussion/3947/a-right-pain-in-the-knee/#Item_4