Re: [CR] modifying old bike parts

Example: History

Date: Fri, 3 Jul 2009 13:06:37 -0500
From: Eric Burns <>
To: Brian Van Baush <>
References: <>
In-Reply-To: <>
Subject: Re: [CR] modifying old bike parts

Brian Van Baush wrote:
> I'd like to caution against modifying old parts to fit your old bike frame.
> If you machine a seatpost, brakes, stems, etc your removing material and
> possibly putting yourself in an unsafe postion if the part fails in use. The
> same caution applies to any frame with a dimple at the down tube, a sign of
> the frame being in an accident.
> Just my two cents, have a safe weekend.
> Brian Anacortes, WA USA


I posted about turning down a 25.4mm post to 24.5mm.

.9mm equals .036 or .018 per side, a difference that could be handled with sandpaper if one was patient enough.

If 18 thousands of an inch makes any appreciable difference in the strength of a seatpost, then that seatpost is unsafe to begin with.

You don't really think that the manufacturers really use a different billet or casting for each size do you?

Your caution might have some value in a paranoid, legal sense, but even that should have little application to a 50+ year old bicycle.

I'll have a wonderful, fun-filled weekend, while you are being safe <g>

Rick Burns

Streator, IL usa