[CR] Questions about Original Shimano Deore

(Example: Events:Cirque du Cyclisme)

Date: Fri, 20 Nov 2009 22:32:48 -0800
From: Jerome & Elizabeth Moos <jerrymoos@sbcglobal.net>
To: <classicrendezvous@bikelist.org>
In-Reply-To: <009a01ca6a43$45df36d0$0202a8c0@alpooter>
Subject: [CR] Questions about Original Shimano Deore


I'm considering the original Deore for an upcoming build. Here are the Deore cranks in a 1982 catalog:

http://www.sheldonbrown.com/shimano1982/pages/27.html

The crankarms are compatible with TA Cyclotourist outer rings, but the Deore rings were 5-hole, not 6-hole like Cyclotourist. Outer ring could be drilled for only one inner ring (double) or two (triple). But there were also LD and MD outer rings. The catalog does not give the BCD of any of the rings, only the range of teeth for each. From this it looks like the LD double probably had a 130 BCD inner, compatible with DuraAce rings. Sutherland's in two Editions I have says the triple inner was 85 mm, only 1 mm different from Stronglight model 99. Did they really make it 1 mm different from one of the most widely available touring cranks?

But the MD version is a mystery. The inner ring on the MD double and the middle ring on the MD triple had a range of 34-37 and 34-35T respectively. One thinks these must have been the same BCD, but what? Did they use the common 110 BCD or the Campy triple inner 100 BCD or the Avocet/Ofmega triple inner 102 BCD? Anyone have any original Deore MD rings for trade or sale? Or any original Deore rings for that matter?

Regards,

Jerry Moos
Bog Spring, Texas, USA