Re: [CR]650B? Rims

(Example: Production Builders:Pogliaghi)

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Date: Sat, 10 Mar 2001 13:19:55 -0500
To: Jerry & Liz Moos <>, Classic Rendezvous <>
From: "Sheldon Brown" <>
Subject: Re: [CR]650B? Rims

Jerry & Liz Moos wrote:
>My recently purchased early 70's Lejeune tandem came with original Campy
>Tipo hubs laced to what I thought were Araya 650B rims, but with the
>oddball 650D (xx-587) tires made only by/for GT.

Jerry, there's no sucha thing as "650D". The GT oddball 587 mm size was designated (by GT) "700D"
> As 650D wheels could
>not possibly have been original, I figured someone had substituted
>incorrect 650D tires for the proper 650B (xx-584), but got away with it
>because the difference is only 3mm. I purchased some 650B Michelin
>World Tour tires and installed one today. It went on, but only with
>great effort. The rim is marked Araya RM-20, but has no size markings.
>I measure it about 570mm inside diameter and about 597mm OD to the tops
>of the flanges, but I don't think I can measure a built-up rim closely
>enough to tell the 3mm difference between 650B and 650D.

Sure sounds like a 700D to me.
>I see no point trying to find spare
>650D tires, and if I conclude the rims are 650D, will rebuild with 650B,
>both because that is original and because 650D tires are essentially
>impossible to find. Anyone have some different advise?

>anyone see any reason other than difficult tire changes that I shouldn't
>use the 650B Michelins on the possible 650D rims?


Sheldon "Not A GT Fan" Brown Newtonville, Massachusetts +------------------------------------------------------+ | Idiot, n.: A member of a large and powerful tribe | | whose influence in human affairs has always been | | dominant and controlling. | | --Ambrose Bierce, "The Devil's Dictionary" | +------------------------------------------------------+
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