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seat tube angle(3 posts)

seat tube anglecrystal11
Jul 29, 2001 9:11 PM
I have noticed that some stock sizes of 48cm frames have s/t angles of 73 to 75. What is the difference in the bike handling of these angles? If a person wants a shorter top tube is changing the angle something that could be done to accomplish that without harming the way the bike is designed to handle?
re: seat tube angleJohnG
Jul 29, 2001 10:07 PM
You have to look at the total geometry to make any kind of semi-informed guess as to how a bike will handle. The STA by itself is relatively meaningless.
JohnG
YepSpoke Wrench
Jul 30, 2001 5:43 AM
There are four things a bike designer can do to design a bike with a short top tube:
1. Live with toe clip overlap with the front wheel.
2. Use a steeper seat tube.
3. Use a slacker head tube.
4. Use a smaller front wheel.
My advice is to test ride the bike or at least talk to short women about how they like their bikes. I don't think that the typical 5'10" male sales person has a very good feel regarding the handling of small frame bikes.