re: [CR]65mm BB with Double Chainring ???


Example: Racing:Beryl Burton

Date: Sat, 24 Nov 2007 10:43:29 -0500
From: Harvey Sachs <hmsachs@verizon.net>
Subject: re: [CR]65mm BB with Double Chainring ???
To: classicrendezvous@bikelist.org, avitzur@013.net


Amir - In my experience, the simplist way to handle this is with a 1 or 1.5 mm. spacer on each side. These are widely available here, at least, for spacing FW out, and as left-overs (steel) for offsetting Sturmey splined cogs. If you do this and plan to loan it to the local weight-lifting team, I'd use longer rather than shorter BB cups...

For 70 mm BBs, I've sometimes gotten away with a Campy "thick" cup on one side or the other, depending on chain line. Clones are available from the leading Japanese marques.

Good luck! harvey sachs mcLean va

Amir Avitzur wrote: My 50's Hobbs has a 65mm bottom bracket. I'd like to use a Stronglight 49D on the bike.

I found a Stronglight double axle that works with my 49D but it has 3 mm of adjustable cup threads showing.

A few questions about this?

Where were 65 mm bottom brackets common besides track bikes?

Was 65 mm common for cottered crank, single chainring British bikes?

Is there a cottered crank with double chainring for this bike?

What were the work-arounds to make it a double? The Hobbs' chainstays are only crimped on the inside. I cannot fit a double chainring on a track axle.

Are there any square tapered axles for 65 mm bottom brackets running double chainrings?

Amir Avitzur
Ramat-Gan, Israel