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bike fit(3 posts)

bike fitjpmode
Aug 5, 2001 6:50 AM
I am relative newbie (riding about 20 miles/day 5 days a week) considering buying a 53 cm Bianchi roadbike over the net. I am now riding an older 57 cm Specialized that I think is too big for me. I am about 5'8" tall with a 31 inch inseam. Based on a formula I got on the net, I think I should be riding about a 53 cm frame. My question: Does 53 cm sound like it's in the ballpark for someone my size? Thanks a lot.
re: bike fitbianchi
Aug 5, 2001 9:40 AM
According to Greg Lemonds book and formula a person with a 31 inch inseam should be riding a 51.2 cm frame.I think the 53 would be alot better than the 57 cm.I would go for it if you like the bike.I ride a Celeste Bianchi.Love it!
fit info...C-40
Aug 5, 2001 9:42 AM
Go to coloradocyclist.com and read up on bike fit. Your current bike can be used to help measure you true inseam. Block up the wheels, (equally) until you get very firm pressure when straddling the bike in bare feet (shouldn't take much!). Measure from the floor to the top of the top tube to get your inseam. Subtract 27 to 28cm to get your frame size. The idea is to get 2-4cm of standover clearance. I'll bet you find your inseam to be closer to 32 inches which would put you on a 54 to 55cm. At 5'-8", a 53 will have a pretty short top tube, which might require a 120 or 130mm stem.