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Eccentric Chain Stays on Schwinn Moab.3

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Eccentric Chain Stays on Schwinn Moab.3

Old 10-19-16, 08:34 PM
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Eccentric Chain Stays on Schwinn Moab.3

Eccentric Chain Stays on Schwinn Moab.3. This is a new one on me.

The title says it all: I just picked up a really cute little 1996 Schwinn Moab.3 and noticed that the frame looks peculiar where the chain stays approach the rear axle from different angles.

It looks like the right chain stay is distorted but a search on the internet yielded a picture of a much bigger 1996 Moab.3 suggests that all of the 1996 Moab.3 bikes have the same peculiarity.

Can anyone suggest a reason why the frame would have been built like this ??
Clearance does not seem to be a problem.

I've never seen anything so obviously like it before.





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Old 10-19-16, 09:02 PM
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It puts the chainstay further from the chain so the frame takes less of a beating from the chain over rough terrain.
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Old 10-19-16, 09:33 PM
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And "eccentric" is usually a term to describe a rotating circular fitting with a detail that's off center. So as the fitting is rotated this detail changes it's position WRT the housing the circular fitting is held within. On bikes this is typically a BB. So as the fitting/eccentric which contains the detail/BB is rotated within the frame shell the chain can be tightened or loosened. Tandems and some single speed bike use this design.


The bike referenced has a curved stay to allow for greater chain clearance. An attempt to reduce chain slap with the stay's top surface. Andy.
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Old 10-19-16, 09:35 PM
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Originally Posted by well biked View Post
It puts the chainstay further from the chain so the frame takes less of a beating from the chain over rough terrain.
Thats it ??

Makes sense I guess.... but why aren't ALL bikes built like this ?

Schwinn did it for just one model and for just one year.

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Old 10-19-16, 09:53 PM
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Originally Posted by Binky View Post
Thats it ??

Makes sense I guess.... but why aren't ALL bikes built like this ?

Schwinn did it for just one model and for just one year.

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Schwinn was a quirky company during the '90's, to say the least. FWIW, the Moab wasn't the only model to have this feature. As to why some mtb models had the feature and others didn't (among Schwinns), probably had more to do with the frame material of the particular model than anything else. And honestly, it wasn't exactly a world-changing feature anyway.
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Old 10-20-16, 06:37 AM
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Originally Posted by Binky View Post
.... why aren't ALL bikes built like this ?

B/c it's not particularly important.


With the possible exception of CF frames and maybe severely rust-inducing climates, it's an aesthetic question only.
Usually, it's entirely safe to ignore.
If it worries you, fit a chain stay protector.
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Old 10-20-16, 09:38 AM
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+1, its intentionally bent not eccentric . un usual maybe.
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Old 10-20-16, 01:07 PM
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Wouldn't a slap guard have been just as effective and less costly (and replaceable)?
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Old 10-20-16, 02:47 PM
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Originally Posted by dweenk View Post
Wouldn't a slap guard have been just as effective and less costly (and replaceable)?
Sure, but a lot less attractive feature to write something about in the marketing material...
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Old 10-20-16, 03:53 PM
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Originally Posted by dabac View Post
Sure, but a lot less attractive feature to write something about in the marketing material...
I can find no mention or explanation of this unique feature in the marketing material (such as is is) which is why I decided to ask the highest authorities... youse guys.

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Old 10-20-16, 04:00 PM
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Originally Posted by Binky View Post
I can find no mention or explanation of this unique feature in the marketing material (such as is is) which is why I decided to ask the highest authorities... youse guys.

Bink
From your photo, I'm thinking now that maybe you know some guys who may come visit me to talk about dissing your chainstay.
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Old 10-20-16, 04:02 PM
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Originally Posted by dabac View Post
Sure, but a lot less attractive feature to write something about in the marketing material...
Bike companies are desperate to come up with anything that will make their products stand out...
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Old 10-20-16, 05:09 PM
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Originally Posted by Binky View Post
I can find no mention or explanation of this unique feature in the marketing material (such as is is) which is why I decided to ask the highest authorities... youse guys.

Bink
Schwinn catalogs, 1991 - 2000 (92 of 577)
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Old 10-20-16, 05:20 PM
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Originally Posted by well biked View Post
Ah-Hah !!!!

Now I see it. I did not notice that the Paramount frames had a similar asymmetrical feature.

Thanks for pointing this out. You guys are the best.

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Old 10-20-16, 08:55 PM
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Univega did dropped chainstays for a little while also. Schwinn and Univega probably figured that it wasn't worth the trouble to have custom chainstays bent for them.

Reducing chain slap IS awfully nice, though.

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Old 10-21-16, 03:39 AM
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Lube your chain...
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Old 10-21-16, 06:52 AM
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Originally Posted by rmfnla View Post
Bike companies are desperate to come up with anything that will make their products stand out...
This one sentence describes the bicycle industry in the best terms I've ever heard.
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Old 10-21-16, 09:57 PM
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Originally Posted by dweenk View Post
From your photo, I'm thinking now that maybe you know some guys who may come visit me to talk about dissing your chainstay.
If I could find out where in the Bike Forum preferences to change my avatar picture, I would change it.
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