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What is this doohickey on my trek 750

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What is this doohickey on my trek 750

Old 09-07-14, 06:11 PM
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ksryder
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What is this doohickey on my trek 750

I removed this. Cleaning up my 1994 Trek 750. What is this and what is its purpose?

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Old 09-07-14, 06:14 PM
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arex
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Anti-chainsuck device, I think.
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Old 09-07-14, 06:24 PM
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It's a doohickey.










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Old 09-07-14, 07:01 PM
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Originally Posted by arex View Post
Anti-chainsuck device, I think.
Shouldn't anti-suck be called blow?
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Old 09-07-14, 07:31 PM
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Originally Posted by wineslob View Post
It's a doohickey.

No... it's definitely a thing-a-ma-jig.
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Old 09-07-14, 07:36 PM
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Originally Posted by wineslob View Post
It's a doohickey.
Nope. Doohickey is a pump peg made by Zefal.
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Old 09-07-14, 07:37 PM
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I've seen those on older Trek mountain bikes, but never on one of their hybrids.
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Old 09-07-14, 07:37 PM
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Originally Posted by Kactus View Post
No... it's definitely a thing-a-ma-jig.
Avid had a Rollamajig dunno about a thingamajig.
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Old 09-07-14, 07:56 PM
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At first I thought it was a whatchamacallit but then I remembered the great widget crisis of 84 (who could forget?) so I knew that couldn't be it
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Old 09-07-14, 09:44 PM
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That's a gizmolic. I've got a bunch of em.
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Old 09-07-14, 11:13 PM
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Originally Posted by noglider View Post
Shouldn't anti-suck be called blow?
My physics teacher always enjoyed correcting us, "Now remember, the universe doesn't suck."
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Old 09-08-14, 08:45 AM
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Yes, it is evidently there to catch the chain if it gets pulled upward while exiting the chainring. I have never seen one before -- the closest thing I have is a Sharkfin, a plastic thingie on the top of the chainstay, designed to keep the chain from falling between the tire and the frame.
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Old 09-08-14, 08:50 AM
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Chronosynclastic Infundibulum
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Old 09-08-14, 09:14 AM
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I have two 1995 Trek 730's and neither has that device on it.
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Old 09-08-14, 09:16 AM
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Veeblefetzer.
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Old 09-08-14, 09:24 AM
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Keith Bontrager made them .. Trek Owns Him Now too..
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Old 09-08-14, 10:20 AM
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Anti chain suck device.

If too much crud gets cacked onto the rings of if the teeth deform from use the chain fails to dis-engage from the teeth and gets sucked up into the space between the frame and rings. It can be a pain to get it un-done.

If you get chain suck from defromed teeth identify the offending teeth and smooth the deformation with a file/grinder.
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Old 09-08-14, 11:40 AM
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Originally Posted by fietsbob View Post
Keith Bontrager made them .. Trek Owns Him Now too..
I have several Bonty mtb and both have this device. One time I blew through a mud puddle and the chain sucked the anyway and tacoed the chain ring and crankspider so I took them off; never had chain suck again (but I tend to keep the drivetrain clean anyway).

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Old 09-08-14, 12:18 PM
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Thanks everyone. Doubt I'll ever need it but it's sitting in my parts bin now. I plan to change the gearing on this thing so it won't fit regardless.

This was my commuter during grad school, it's going to be my gravel/winter bike now. It was 100 degrees here last week but I'm trying to stay ahead of the curve on winter this year. I'm sick of gaining weight every winter.
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