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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: wtf chain ring bolts
Date: Thu, 6 Mar 2025 15:34:55 -0600
Organization: Yellow Jersey, Ltd.
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On 3/6/2025 2:26 PM, Jeff Liebermann wrote:
> On Thu, 06 Mar 2025 12:46:42 -0500, Catrike Ryder
> <Soloman@old.bikers.org> wrote:
> 
>> On Thu, 06 Mar 2025 17:04:06 GMT, cyclintom <cyclintom@yahoo.com>
>> wrote:
>>
>>> On Wed Mar 5 16:08:18 2025 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.
>>>
>>>
>>>
>>>
>>> Modern crank bolts can be made out of aluminum and instead of allen bolt may be Torx. Usually you can use the camera option on your smart phone to see close enough to identify this.
>>
>> Aluminum crank bolts are for weight weenies, and I did try a torx
>> driver on them. The bolts were mismanufactured. I tossed them. Not
>> worth trying to return them.
> 
> They also may have been misordered.  There are Torx and Torx Plus
> heads.  Common Torx heads have a 15 degree drive angle, while Torx
> Plus has a zero degree drive angle.
> <https://i.imgur.com/dvIdABh.jpeg>
> 
> "The Evolution of Torx: From Torx to Torx Plus and Beyond"
> <https://www.youtube.com/watch?v=EhRcWaEkHtE>  (7:52)
> 

Standards are wonderful. We ought to have lots of them.

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