Join Date: Jun 2004
Location: Northern Nevada
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Originally Posted by xfimpg
I thought i'd ask in here because I'm not convinced of what I heard.
A local bike fitter (Specialized dealer) informed me that a mountain bike geometry promotes leaning forward more than a road bike, which is one of the reasons why mountain biking is harder on the lower back.
?? Well, this is the first I've heard of this.
Regardless of the back pain comment, has anyone heard this leaning geometry comment before? Or something to that effect?
I don't MB much anymore (I'm 65; the hills are steeper now), but I was sort of a pioneer around here in the early '80s. That was before suspension, before downhill became the headliner at every event, even before fat tires, and you had to work hard on technique. Climbing was particularly tricky, because the tires didn't grip very well--it was a constant balancing act between keeping enough weight on the front wheel so you didn't pick it up and enough weight on the back that you didn't break traction. In those circumstances, even moving your head forward and back would make a difference. The bikes in those days were designed to be ridden everywhere, not just to blast downhill, and so you'd often be stretched out to keep the front wheel down.
Having said that, though, the FRAME geometry--head and seat tube angles etc.--doesn't vary much from one bike to another. Most of the change in seating position comes from the stem length and height, with some probably from the saddle fore-and-aft. If you're having back problems, try a stem change.