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C&V crankbolt washer options

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C&V crankbolt washer options

Old 06-30-20, 02:18 PM
  #1  
LeicaLad 
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C&V crankbolt washer options

Friends,
So, I seem to be short of crank bolt washers, and haven't found a source for them. In my search, I begin to wonder why the
crank bolts that I do have seem to be oddly under-sized for the task.

Photo #1 has a "proper" washer and a possible nylon substitute, although I find them both too small. The nylon one is slightly smaller of the two, as well.
Photo #2 shows the fit. The standard bolt rattles around in that space, and the washer rattles around in the crank arm, too.

Photo #3 is a rubber washer that fits in quite snugly. Would there be reasons NOT to use something like this? I'm mostly just curious.
Photo #4 is the fit.

Thank you for the advice.



"official" crank bolt washer and nylon option

Loose fit of the "official" washer

A rubber washer

that fits very snugly
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1982 Tom Ritchey Everest
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Old 06-30-20, 03:14 PM
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You don't want to use anything other than metal for this. Nylon and rubber squish and can eventually cause the crank bolt to back out and ruin the crank.
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Old 06-30-20, 03:28 PM
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Use the correct steel washer, the fit of the OD is irrelevant and the washer will not move anyway when the bolt is torqued against it.
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Old 06-30-20, 05:00 PM
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LeicaLad,
I ran into similar issues with some of my cranks. I went to Fastenal and ordered the correct washers for fit but the bolts for the cranks were only 13 mm size and the fit was a bit sloppy. I added an additional 8 mm washer to the set and it works quite well. I can sell the kit for $4 plus postage for shipping (two bolts and four washers). Pics are here:




Let me know if you want a set of these. Best fix I have managed to come up with. Smiles, MH

Last edited by Mad Honk; 06-30-20 at 05:03 PM.
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Old 06-30-20, 08:07 PM
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Thanks for the suggestions. I do have a Fastenall shop quite close by. I don't really want to stack washers, as that reduces the thread bite into the axle more than I would prefer.

I'm also curious about the comment of nylon or rubber "squishing" and causing the crank bolts to back out. I'd think the rubber quite thin, and if the crank bolt is reasonably tight, all the possible squishing is already done. Plus it appears that it would provide a rather tight seal. I find crank bolts need re-tightening on a regular basis, anyway.

Still hoping for further explanations.

Thank you all.
__________________
1959 Hilton Wrigley Connoisseur (my favorite!)
1963 Hetchins Mountain King
1971 Gitane Tour de France (original owner)
* 1971 Gitane Super Corsa (crashed)
* rebuilt as upright cruiser
1971 Gitane Super Corsa #2 (sweet replacement)
1980 Ritchey Road Touring (The Grail Bike)
1982 Tom Ritchey Everest
(replacing stolen 1981 TR Everest custom)
1982 Tom Ritchey McKinley (touring pickup truck)
1985 ALAN Record (Glued & Screwed. A gift.)
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Old 06-30-20, 08:51 PM
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If you use a nylon washer you will not pull the crank arm into the tapered BB shaft with the full force required.
This will cause the steel taper of the shaft to damage the tapered hole in the softer aluminum crank arm.


All the best

Barry
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Old 06-30-20, 10:00 PM
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Originally Posted by LeicaLad View Post

Still hoping for further explanations.

Thank you all.
,,,if you look at some of the more modern crank bolt designs (the product of innovations in machining technology and metal fabrication), you'll notice a gradual evolution in these bolts.

Thus were born the washerless designs:




Mostly, those washers are present in the older design to distribute the pressure forces of the bolt head over a larger surface in the softer aluminum alloy crank. They also help to prevent galling of the aluminum every time you tighten or loosen the bolts, and when lightly lubricated with a thin film of grease, help you to judge torque more accurately. Nylon/rubber are not really a good substitute for distribution of this load.

I've taken to using the socket head bolts lately, to keep from having to fiddle with the crank caps.
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Old 07-01-20, 03:50 AM
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Thank you. This makes perfectly good sense.

Best to you all!
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1959 Hilton Wrigley Connoisseur (my favorite!)
1963 Hetchins Mountain King
1971 Gitane Tour de France (original owner)
* 1971 Gitane Super Corsa (crashed)
* rebuilt as upright cruiser
1971 Gitane Super Corsa #2 (sweet replacement)
1980 Ritchey Road Touring (The Grail Bike)
1982 Tom Ritchey Everest
(replacing stolen 1981 TR Everest custom)
1982 Tom Ritchey McKinley (touring pickup truck)
1985 ALAN Record (Glued & Screwed. A gift.)
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