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compatibility question: threading for crank bolt caps/self-extractors on Shimano 7700

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compatibility question: threading for crank bolt caps/self-extractors on Shimano 7700

Old 07-06-13, 05:33 AM
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mikemowbz 
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compatibility question: threading for crank bolt caps/self-extractors on Shimano 7700

So, quick question is in essence this:

Will these Truvativ caps/self-extractors work as a substitute for these OEM Shimano crank bolt caps/self-extractors?

The bolts seem likely to play nice - M15 bolts intended for ISIS/Howitzer are still M15 bolts, right? However...

I don't know about the threading/dimension on the caps. Is there a standard here, or does any know if they happen to be the same?

The Truvativ caps/self-extractors are apparently M22...but I can't find the spec on the OEM Shimano units (Y-16P 98020, 'Crank Arm Cap').

If I had these on hand, I'd just try 'em, but I don't.

These Truvativ bolts+caps for $11 would sure beat paying out the nose for OEM if they'll work.

I have an NOS 7703 crankset missing bolts/caps, and wish to achieve the look of the OEM shiny silver caps without the expense.

Last edited by mikemowbz; 07-06-13 at 05:38 AM. Reason: spelling, detail
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Old 07-06-13, 05:42 AM
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Hmm, I have a pair of these cranks minus bolts too...

Colour me interested.
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Old 07-06-13, 06:24 AM
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AFAIK, almost all current "conventional" crank arms (i.e. w/o a built in spindle) use the same M22 threads for the crank puller and dust caps so the Truvative autoextractor ring and bolt should fit any Shimano Octalink crank.
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Old 07-06-13, 05:50 PM
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Originally Posted by HillRider View Post
AFAIK, almost all current "conventional" crank arms (i.e. w/o a built in spindle) use the same M22 threads for the crank puller and dust caps so the Truvative autoextractor ring and bolt should fit any Shimano Octalink crank.
I kind of figured...otherwise you'd need a unique extractor tool, a la vintage TA/Stronglight, right?

In retrospect, this may have been kind of a dumb question.

Obviously the threading has got to be right, and I have to suspect the dimensions are otherwise going to be kosher, too...

Thanks for the response!
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Old 07-06-13, 06:26 PM
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I'm in the market for replacement self-extracting bolts too. For now, I just put a crank back on with the bolt, minus the self-extracting bits. How do these work, coming in pieces like that? Also are these truvativ ones solid?
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Old 07-07-13, 12:27 AM
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Originally Posted by RubeRad View Post
How do these work, coming in pieces like that?
The collar threads into the crank over the bolt, with the washer in between. Unscrew the bolt, and it presses the crank off the spindle via the washer and collar.
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