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From: Roger Merriman <roger@sarlet.com>
Newsgroups: rec.bicycles.tech
Subject: Re: wtf chain ring bolts
Date: 6 Mar 2025 12:59:35 GMT
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zen cycle <funkmasterxx@hotmail.com> 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 :)
> 

Talking of standards, my dad had loads of fun, at Halfords which is car and
bike chain stores, getting some new tyres for the New Hudson bike which is
old much abused bike and has 26inch tyres but not the “normal” ones which
resulted in lots of head scratching by Halfords, I think there are 3
separate similar sized but different sizes with out checking the bible aka
Sheldon Browns site!

Roger Merriman