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, email@example.com wrote:
>> What exactly is Magny Ishiwata? Manganese molybdenum
>> alloy by a tube maker named Ishiwata?
>> 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
> Ishiwata is well respected and comparable to Tange, Reynolds, Columbus,
> etc. They made a full range of tubing, from seamed, high-tensile
> to seamless butted alloy Manganese or Cro-Mo:
> 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