Join Date: Sep 2006
Location: Topanga, but I'm not a hippy
Bikes: IF Club Racer, Bike Friday Pocket Rocket
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You should shop around to see if you can find a better fit from another manufacturer. Improper fit will cause cause discomfort and injuries. You shouldn't buy a bike that you'll 'grow into'. It might not happen the way you anticipate. Sounds like your longer legged, and shorter torso'd, try the treks. I have short legs and longer torso. I've never fit well on a trek because of that.
Having said that. I don't think there's much coorelation between weight loss and fit geometry. However, increased flexibility in the torso will allow you to reach further.
When I had my bike fit, they set it up so I was comfortable on the tops of the bars, and had to extend to ride the hoods or drops while maintaining proper posture. As my flexibility has increased, I can now ride on the hoods for a time in proper position. However, the basic geometry has remained the same.
ps. Improving flexibility requires stretching, and saddletime, both of which aid in weight loss, so of course there is that indirect relationship.