Re: [CR]Re:Ishiwata trivia


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From: Steve Leitgen <sleitgen@charter.net>
Subject: Re: [CR]Re:Ishiwata trivia
Date: Sat, 15 Oct 2005 21:09:40 -0500
To: worthy2@earthlink.net
cc: classicrendezvous@bikelist.org

I have a box of 015 in the basement. I see that wasn't mentioned. I assume it was the lightest.

Steve Leitgen La Crosse, WI

On Oct 15, 2005, at 12:48 PM, worthy2@earthlink.net wrote:
>
>
>>
>> What exactly is Magny Ishiwata? Manganese molybdenum
>> alloy by a tube maker named Ishiwata?
>
> Yes.
>
>> If yes, then how does Ishiwata compare with Tange (a maker whose
>> counter intuitive numbering system I am familiar with)
>> as a Japanese tube maker? Better, same, or worse than
>> Tange?
>
> Ishiwata is well respected and comparable to Tange, Reynolds, Columbus,
> etc. They made a full range of tubing, from seamed, high-tensile
> gaspipe
> to seamless butted alloy Manganese or Cro-Mo:
>
> http://www.equusbicycle.com/bike/ishiwata/ishiwata.htm
>
> Their "Alpha" tubing was the lightest steel tubing available for
> bicycles. The Mangalloy sets were considered mid-level. The "022" set
> was quite popular and essentially identical to Columbus SL.
>
>
>
> Yes and to that I would add (from memory, so watch out!) that I always
> heard it that Ishiwata was essentially a metallurgic copy of the 531
> Reynolds formula (that is a Manganese-molybdenum-steel alloy) where
> Tange opted to copy the Columbus formula (Chromium-molybdenum-steel).
> But that's just a crude analogy, I reckon. I believe that Magny was
> their cheaper straight-guage Mang-moly tube, and might not have been
> seamless cold-drawn, but don't know for sure. it shows up on lower
> cost frames, compared to their venerable 022 tubeset, that was also
> very popular with USA builders, and their lighter gauge 019 and
> super-light 017 tubesets, I understand that they are no longer in
> business, too bad!. I can attest that my 3Rensho built with 019
> Ishiwata rides like the best of them.(Again this info was from memory
> and hearsay, so take with salt.)
> Alan Goldsworthy
> SF, CA