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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: wtf chain ring bolts
Date: Fri, 7 Mar 2025 07:40:46 -0600
Organization: Yellow Jersey, Ltd.
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On 3/7/2025 5:20 AM, zen cycle wrote:
> On 3/6/2025 12:37 PM, AMuzi wrote:
>> On 3/6/2025 10:54 AM, bp@www.zefox.net wrote:
>>> AMuzi <am@yellowjersey.org> wrote:
>>>>
>>>> As an aside, tubulars, the oldest standard which size has
>>>> not changed since the 1890s, are variously labeled "700C"
>>>> (they are not; the 700 type C was developed later to
>>>> exchange wheels with the same brake height as a tubular) or
>>>> "27 inch" (they are not; 27 inch systems are larger) or "28
>>>> inch" (again, 28s are all much larger) even down to 
>>>> today by
>>>> various tubular makers in some weird vestigial rite.  The
>>>> net effect is confusion to riders and is not at all 
>>>> helpful.
>>>
>>> As a matter of curiosity, what is that standard size called,
>>> and how is it measured?
>>>
>>> Thanks for writing,
>>>
>>> bob prohaska
>>
>> "tubulars".*
>>
>> They predate numerical designations but originally were 
>> called 28 inch as they were a lot fatter then. Actual rim 
>> diameter is 630mm.
>>
>> And now, we return to fat tubulars for 'gravel' and cyclo 
>> cross. The ever popular 23mm tubulars are about 26-1/2 
>> inches edge to edge. Newer fat tubulars are about 27-1/2 
>> inches on that rim.
>>
>>
>> *there are/were 26" tubulars for TT and track, 24" for 
>> children's bikes and 22", 20" for wheelchairs. All are and 
>> were specialties/oddities with no significant volume.
>>
>> https://howirollsports.com/shop/panaracer-rapide-20-inch/
>>
> 
> One of my best friends (still) has an old Takara "funny 
> bike" from the 1980's with a 24" front wheel, he had 
> tubulars on it. Even then, a 24" tubular was special order.

Right. That had its popular moment both in professional 
level machines:

http://www.yellowjersey.org/xrr.html

and in 'econo' versions:

https://www.yellowjersey.org/axr.html

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