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Seat stay/chain stay?

Old 09-03-09, 02:31 PM
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meech151 
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Seat stay/chain stay?

Being a new frame builder I am constantly running into situations that are new to me but some of you have already encountered. My question is, I have an old pair of S-bend seat stays, I believe 17mm, that i cut too short a while back and I saving them for that frame that eventually comes along so that I can use them. Today I was looking at them thinking they could make a sweet pair of chain stays, is this a good or bad idea? They seem fairly beefy, I don't think any lighter than the OX Platinum chain stays I have been using. Give me some opinions.

thanks

Dimitri
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Old 09-03-09, 08:09 PM
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17mm is way too small for chain stays. Old school std diameter tube frames used 22.2 mm chain stays and newer frames use ovalized 24mm stays.
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Old 09-03-09, 08:57 PM
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Also depends who is going to ride the frame. If it is for a 100 lb lady to ride to church once a week it is probably not a problem.
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Old 09-03-09, 11:35 PM
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There are a lot of bikes that do use pretty thin chainstays. Examples are the straight 4130 stays or bontrager type deals that use 5/8" joined to 1/2" tubing, but the wall is about 1/16". Normally the fatter tubing in STs is pretty thin wall. It could be interesting as an experimental you want to try out on yourself, when you just have to know.
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Old 09-04-09, 07:12 AM
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meech151 
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That was more or less my thinking, mainly experimental. I can't think of any frame in particular but I know I have seen some really small chain stays, maybe on old bikes or something and I don't know how thick they were. If I were to use them and put a large fillet around the base of the BB shell and then equally strong seat stays I don't see why it wouldn't work. Where would the problem be mainly, in side to side flex from torque on the crank. Also, are S-bend style stays stronger than straight or is it just for looks? Thanks for the feedback.
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Old 09-04-09, 09:44 AM
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Stronger in what aspect. The longer a stay is for a given stay length, the more flexible it will be, all else equal. The bends are to blend spacing for the hub and the brakes, or tire clearance.
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