Ever since I built up my new XC rig, I've been having knee problems. We've looked at all kinds of things to get the positioning correct, and for while it seemed okay, but since the problems have returned.
Everything in terms of seat height and saddle fore/aft position we've already tweaked and spend a lot of time on. However, things now point to cleat position. On the XC rigs I'm ditching XPedo pedals to go back to Shimano pedals, as I never had problems before I went to XPedos. Float on the XPedos is a measly 4 degrees, whereas on the Shimanos (various models) its in the 12 to 15 degree range.
I've just done some measurements between my road and mountain bikes, and noticed something which could be a concern.
On the road bike (Giant TCR A2), I don't really have any knee problems, though my hips do start to hurt a bit.
My two XC bikes are an Giant XTC and a Giant Talon.
The Talon has never really caused me too much trouble, and geometry there we think is pretty right, except that I've barely ridden it since putting XPedo pedals on, so it's hard to tell.
Basically, the one measurement I just paid attention to was the distance between the inside ball of my foot to the center of the frame. The measurements were frighteningly different, and what I want to know is if this is any cause for concern. I can see how it would affect how your knee twists and works under load:
Talon: 103mm - Keep in mind I've not ridden this enough since putting XPedo pedals on though. Position on the Shimano M505s seems to be about 3mm further outwards (which would make this figure 106mm in a position which never gave me problems).
That kinda throws the theory is that the Talon is further out yet might be okay.
Toe-in on both the road and XC bikes is similar, though I have not actually measured this angle.
I'm after any input here which might help resolve this. It's a problem I desperately want solved before State round 1 and the 24 hour in 3 weeks time (State won't give me a problem, as the knee doesn't give problems on <3 hour rides, but the 24 hour the week before will destroy it).
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