Re: [CR]531P vs 753 - How to Tell the Difference?


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Date: Sun, 13 May 2007 22:25:49 -0500
To: classicrendezvous@bikelist.org
Subject: Re: [CR]531P vs 753 - How to Tell the Difference?
References: <317650.21786.qm@web50212.mail.re2.yahoo.com>
In-Reply-To: <317650.21786.qm@web50212.mail.re2.yahoo.com>
From: "John Thompson" <johndthompson@gmail.com>


John Barry wrote:
> Presuming that you had a frame that you knew was
> either made of 531P, or 753 (spec'd with the same tube
> wall thicknesses), would there be a way to tell which
> it was?

753 was heat treated and considerably harder than 531. Hardness testing in mid-tube (away from heat-affected areas) would probably answer your question.

--
John Thompson (john@os2.dhs.org)
Appleton WI USA