Re: [CR] Was Unusual FR Peugeot PX-10, now Wood plug

(Example: Framebuilding:Technology)

In-Reply-To: <4BD212F6.2050509@aol.com>
References: <674B61C3DB034BB493732E1E7D2CEFD8@GREER>
From: "Kurt Sperry" <haxixe@gmail.com>
Date: Fri, 23 Apr 2010 15:54:04 -0700
To: verktyg <verktyg@aol.com>
Cc: Classicrendezvous@bikelist.org
Subject: Re: [CR] Was Unusual FR Peugeot PX-10, now Wood plug


On Fri, Apr 23, 2010 at 2:36 PM, verktyg <verktyg@aol.com> wrote:
> One other thing, many "all Reynolds" or "all Columbus" production frames
> were not "ALL"! As shown above, many French makers used cheap sleeved pipe
> for steerers plus a lot of builders including some of the top names used
> cheap seamed tubing for the head tubes!
>

Cheap seamed headtube = not likely to ever be a problem I'd expect. The primary load path at the bikes head is from the bottom HS race onto the down tube with the head tube mostly just locating the top HS race and steerer relative to the lower and providing a small degree of lateral location bracing for the top tube. How many head tube problems has this list seen? Steerer tubes OTOH are a whole hell of a lot more potential concern. That (and the fork) are maybe the worst parts on a bike to cut corners. Use a cheap seamed head tube, top tube or perhaps seat tube or seat stays and it'll probably never be an issue- or at least a safety issue. If one has to go off tubeset spec, those I reckon are the logical places to save.

Kurt Sperry
Bellingham, Washington
USA