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Path: utzoo!watmath!clyde!burl!hou3c!hocda!houxm!houxz!vax135!cornell!uw-beaver!tektronix!hplabs!hp-pcd!craig
From: craig@hp-pcd.UUCP
Newsgroups: net.bicycle
Subject: Re: hub spaces
Message-ID: <9300001@hp-pcd.UUCP>
Date: Wed, 9-May-84 13:39:00 EDT
Article-I.D.: hp-pcd.9300001
Posted: Wed May  9 13:39:00 1984
Date-Received: Tue, 5-Jun-84 08:50:10 EDT
References: <283@wxlvax.UUCP>
Organization: Hewlett-Packard Portable Computer Division - Corvallis, OR
Lines: 18
Nf-ID: #R:wxlvax:-28300:hpcvre:9300001:000:1029
Nf-From: hpcvre!craig    May 31 09:39:00 1984

5 speed spacing is 120 millimeters inside dropout to dropout
6 speed is 125mm.
If you want to convert to 6 speeds in 5 speed spacing, you'll need
a narrow ("ultra 6") freewheel and a narrow chain (Sedisport works well).
If you want 6 speeds and don't want to get a new chain (or want
seven speeds and a new chain) you have to spread the rear dropouts.
No big deal but you may want to have a shop do it so they can make
sure the dropouts are aligned and the rear triangle straight after spreading.
According to something I read somewhere (you might check The Bicycle
Wheel by Brant) wheels built to 5 speed spacing are 40% stronger than
6 spacing (because of the increased dish).  This appears to be academic
(immensilly powerful racers ride 6 speeds with no problam) through
loaded tourers may want to think about it.
If you race, most of the spares in the follow car are 6 speed spacing.
Shimano makes some hubs which fit 6 speeds into 5 spacing by doing
some juggling of the hub spacing.
				Craig Durland
				...!hp-pcd!craig