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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: wtf chain ring bolts
Date: Thu, 6 Mar 2025 08:51:07 -0600
Organization: Yellow Jersey, Ltd.
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On 3/6/2025 5:11 AM, zen cycle wrote:
> On 3/5/2025 5:06 PM, AMuzi wrote:
>> On 3/5/2025 3:08 PM, Catrike Ryder wrote:
>>> The chain ring guard came so I set about mounting the 
>>> chain rings and
>>> the guard. I ordered new chain ring bolts because I 
>>> didn't want to
>>> disassemble the old crank. The new inner bolts had hex 
>>> deep down
>>> inside and I figure that was fine until I could not find 
>>> a allen
>>> wrench that fit them. I tried both metric and standard 
>>> and nothing
>>> fits. The bolts on my old crank take a #5 allen.
>>>
>>> Does anyone know what's going on?
>>>
>>> I ordered another set of 16mm bolts and they look like 
>>> they have a
>>> larger hex that's not set deep inside it.
>>>
>>> -- 
>>> C'est bon
>>> Soloman
>>
>> News to me; 5-arm 110mm chainring bolts are a universal 
>> commodity AFAIK.
>>
>> With a magnifier, see if they are just broached poorly or 
>> maybe if they are Torx.  If you succumbed to the bad idea 
>> of an aluminum chainring bolt that's very possible.
> 
> I have a set that are torx, and it's a known "problem"
> 
> https://www.reddit.com/r/cycling/comments/6drndl/ 
> shimano_chainring_bolts_t30_torx_why/?rdt=44490
> 
> If the bolts have crud built up and the light isn't really 
> good, they can look like Allen,
> 
> Just make sure whether they're Imperial or Metric :)

Imperial are a distinct rarity here in USA ( I went all over 
hell to find a WW allen for my custom Hetchins long ago).

More common are SAE, which outnumber, in fasteners and 
tools, metric to some great degree.

That said, chainring bolts are a minuscule subset of 
fasteners and, as a standard consumer product, not-metric 
are virtually unknown (or at least I have never seen one. 
Not one.)

It did actually turn out to be defective broaching which 
makes more sense than any other variant.

-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971