[CR]Re: measuring built bikes

(Example: Books)

Date: Thu, 27 Jan 2005 15:36:44 -0800
From: "John Jorgensen" <designzero@earthlink.net>
To: classicrendezvous@bikelist.org
References: <MONKEYFOODX3cf3ednH00002908@monkeyfood.nt.phred.org>
x-mac-creator="4D4F5353"
Subject: [CR]Re: measuring built bikes

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Chuck Schmidt responded (sniped)

I'm going with the assumption that the builder could build a level top tube and I measure the actual angle of the intersection of the tubes with protractor. I think the angle finders using fluid, floats, gravity and a level surface are not as accurate? No?

I do not make the assumption that the builder was accurate as to making the top tube level.

My set-up tosses out headset stack height and axle placement in the rear dropout.

It basically uses the axles to work away from, the top tube as a datum usually can work, but might not.

One can easily have a frame that measures 73° parallel but sits 72.5° (really 72 30') when built or the other way at 73.5°.

my reason to measure was for a handling comparative.

John Jorgensen Palos Verdes Ca

I always likes the Sun Instruments poster I saw in the early 70's: Test, Don't Guess.