Re: Re[2]: [CR]Loose pedal threads

(Example: Production Builders:Pogliaghi)

Date: Thu, 13 Nov 2008 18:32:28 -0500
To: Classic Rendezvous <classicrendezvous@bikelist.org>
From: "John Betmanis" <johnb@oxford.net>
Subject: Re: Re[2]: [CR]Loose pedal threads
In-Reply-To: <184429288.20081113170553@rogers.com>
References: <3.0.6.32.20081113165727.017158a8@mailhost.oxford.net> <52207863.20081113161339@rogers.com>


At 05:05 PM 13/11/2008 -0500, Dmitry Yaitskov wrote:
>Sorry, I should have made this clear(er): I have two pairs of Chater
>Lea pedals, they both (or rather, all four of them) fit those cranks
>(also Chater Lea) similarly. Both those pedals fit another English
>threaded crank normally. And I have a TA French-threaded crank that
>these pedals do NOT fit. Also, I don't know but I assume that French
>threading has a different TPI, doesn't it? (If it does then
>French-threaded pedals probably won't go all the way into
>English-threaded cranks even if they have smaller diameter, no?)

Both French and English threads are close in diameter and pitch, which makes it possible to easily tap out French cranks to 9/16 x 20, but Sutherland's doesn't say anything about doing the opposite, which is why I thought a French tap (or pedal) would be sloppy in an English crank.

In your case I suspect it's just a tolerance problem. Even if the pedals were tightened to where they felt solid, they might still rock under load, loosening or causing damage. I think a weak grade of Loctite, like 222, would prevent this from happening.

John Betmanis
Woodstock, Ontario
Canada