Road Cycling - how do you measure your bike?

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mikemets5
09-11-03, 07:42 PM
Hello all,

I hope this isn't a silly question, but I must admit to being confused. I have a 56 cm bike that measures 56 from the center of the bottom bracket (BB) to the top of the seat tube (ST) 57 including the clamp. I was on eBay, and saw a 56 that was said to be measured from the center of the bottom bracket to the center of the top tube (TT). My "56" only measures 54 from the center of the BB to the center of the TT.

What am I missing?

Thanks,
Mike

RdRunner
09-11-03, 07:48 PM
Some people use the center to center measurement and some use the center to top measurement. You have to know which is being used to really know which size frame they have.
Rich Clark
09-11-03, 08:20 PM
It's not how *you* measure it. It's how the manufacturer does. There's no standard.

RichC

roadfix
09-11-03, 08:57 PM
For example....Cannondale & Trek measure their frames center to top of seat tube. Litespeed measures their frames center to top of top tube. Cinelli measures their frames center to center of top tube.

George!
ockey53
09-11-03, 09:39 PM
Email the guy at eBay and ask him to measure the seat tube from center to center. That is from the top of the seat tube to the center of the bottom bracket circle.

-Dan the Man-
roadfix
09-11-03, 10:27 PM
Originally posted by ockey53
Email the guy at eBay and ask him to measure the seat tube from center to center. That is from the top of the seat tube to the center of the bottom bracket circle.

-Dan the Man- Center to Center= center of bottom bracket bolt to center of top tube where it crosses the seat tube.

George!.....;)
roadfix
09-11-03, 10:30 PM
Originally posted by mikemets5
Hello all,

My "56" only measures 54 from the center of the BB to the center of the TT.

What am I missing?

Thanks,
Mike You're not missing anything. They're both correct measurements.