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Help please- Why setback seatposts?(3 posts)

Help please- Why setback seatposts?djkellycx
Oct 12, 2003 5:24 PM
Is it for guys and gals with longer than average legs? to make up for a bike with a short top tube? Why,why why! I race cross and have a 54cm bike, 2 shorter than my road bike. Its common in cross to race a smaller bike than what you would ride on the road, its more manuverable. I felt today though that I was a little cramped, could be my belly, but what the hell, I need a new seatpost soon anyway.
to maintain the desired knee to bb relatioshipirregardless
Oct 12, 2003 5:51 PM
if you're a size 54 like me, you'll notice some frames typically come with a 73.5 degree head tube angle and others typically come with a 74 degree head tube angle. To keep my same knee position over the bb, I use a setback seatpost on the frames with a 74 degree hta and a seatpost without setback on frames a 73.5 hta. Doing this tends to keep the seat centered on the seatpost while maintaining the desired knee position wrt the bb.
replace head tube angle with seat tube angle in prior post! nmirregardless
Oct 12, 2003 5:53 PM
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