Re: [CR]E.A.3 or 650B mystery Mavic Module 4 rims

(Example: Racing:Jean Robic)

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Date: Mon, 18 Sep 2006 23:49:47 -0400
To: Steve Demchak <>,
From: "Sheldon Brown" <>
Subject: Re: [CR]E.A.3 or 650B mystery Mavic Module 4 rims

At 6:56 PM -0700 9/18/06, Steve Demchak wrote:
>I stumbled across what appears to be NOS MAVIC Module 4 rims of
>unknown size. The previous owner couldn't remember what size the
>are and had an English accent. The gentleman's accent may be a red
>Four outer diameters measured with a fiberglass tape. (1.962-,
>1.970-, and 1.963-feet)
>Averages to 1.965-feet and converts to 599-mm.
>Typical depth from outer edge to bead seat is 5.5-mm.
>Calculated bead seat diameter is 588. I have not estimated my
>measurement errors, or calculated my absolute errors.
>E.A.3 should be 590-mm. 650B should be 584-mm.

Better yet, see:

Sheldon "Measure The Circumference" Brown

Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
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