Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: Past discussions
Date: Sun, 6 Apr 2025 19:51:34 -0500
Organization: Yellow Jersey, Ltd.
Lines: 73
Message-ID: <vsv7im$27j0o$18@dont-email.me>
References: <4zxIP.1543101$OrR5.46859@fx18.iad> <vsu8md$1ctvq$1@dont-email.me>
 <vsucgu$1f3fu$4@dont-email.me> <l2BIP.93838$W1a6.57594@fx04.iad>
 <vsupnm$1qeh4$3@dont-email.me>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Injection-Date: Mon, 07 Apr 2025 02:51:35 +0200 (CEST)
Injection-Info: dont-email.me; posting-host="9d96e79eec08a44cee51feb07580ebad";
	logging-data="2346008"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1/5EJI304zupEWUQ2KNXt0g"
User-Agent: Mozilla Thunderbird
Cancel-Lock: sha1:dIwLdqIu2d5/YLTLFEd6DaVbRx0=
Content-Language: en-US
In-Reply-To: <vsupnm$1qeh4$3@dont-email.me>

On 4/6/2025 3:55 PM, Frank Krygowski wrote:
> On 4/6/2025 3:59 PM, cyclintom wrote:
>> On Sun Apr 6 13:09:50 2025 Frank Krygowski  wrote:
>>> On 4/6/2025 12:04 PM, AMuzi wrote:
>>>> On 4/6/2025 11:01 AM, cyclintom wrote:
>>>>> Remember when I said that my bike had 4 mm screws for 
>>>>> the water bottle
>>>>> mount? Flunky told you all that I was lying because 5 
>>>>> mm was the
>>>>> standard for all water bottle mounts. Funny thing is 
>>>>> that my new Time
>>>>> ULTeam uses 3 mm with a wide head. Perhaps Flunky can 
>>>>> suggest why the
>>>>> country of the Tour de France doesn't stick to his 
>>>>> "standard"?
>>>>
>>>> My $5 says it's not a 3mm screw.
>>>> Remove that screw and measure it.
>>>>
>>>> More probably a ULS or a 7991 screw, m5x0.8 with a 3mm 
>>>> hex broach on the
>>>> head.
>>>
>>> Agreed, although I'd bet more than $5.
>>>
>>> It seems Tom doesn't know how to measure or specify a 
>>> screw size.
>>
>> Apparently the professor of mechanical engineering doesn't 
>> know what a digital caliper is or how to use it. 
> 
> :-)  Says the only guy here who thinks those screws are 4mm! 
> Note that the professional bike mechanic disagrees with you!
> 
> I just measured one, but I'm a retrogrouch, Tom. I didn't 
> use a digital caliper. I used a Vernier caliper. (Do you 
> know how to read a Vernier scale? I'm betting on "no.")
> 
> I got 4.80 mm for the major diameter of the thread, or 
> 0.192". Yes, threads are almost always a tiny fraction 
> smaller than their nominal diameter. Those screws are 
> absolutely not 4mm on any frame I've seen.
> 
>> Again Frank cannot keep himself from speaking about what 
>> he knowsz not.
> 
> Have you figured out how to post a link to a photo? Show us 
> a screw partially inserted in that mysterious threaded boss, 
> and show us how you're measuring its diameter.
> 
> BTW, besides working with various inductive proximity 
> sensors and other industrial sensors, besides working with 
> Labview data acquisition techniques, our students had to 
> learn to use various machinist's measuring tools - from gage 
> blocks to vernier calipers - in the Physical Measurements 
> course. As I've said before, Tom, you couldn't have made it 
> through the program.
> 

I have had a great many bicycles and frames in my hands over 
more than half a century (huh.  that sounds impressive when 
I write it that way).

0I know of one exception in all those. One. It was a bright 
yellow Galmozzi owned by Andy Hampsten when he was  a 
promising teenage amatuer.  Galmozzi had brazed 5mm screws 
sticking up off the downtube (frames had one mount or none 
in those days).  The bottle secured with nuts.  But not 4mm.

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