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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: wtf chain ring bolts
Date: Thu, 6 Mar 2025 09:39:29 -0600
Organization: Yellow Jersey, Ltd.
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On 3/6/2025 8:58 AM, Zen Cycle wrote:
> On 3/6/2025 9:51 AM, AMuzi wrote:
>> 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.
>>
> 
> um....It was a joke about metric vs imperial torx, Andrew
> 

Sorry, that went over my head. D'oh.

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