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Old 04-12-20, 11:02 PM
verktyg's Avatar
Join Date: Jul 2006
Location: SF Bay Area
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Bikes: Current favorites: 1988 Peugeot Birraritz, 1984 Gitane Super Corsa, 1981 Bianchi Campione Del Mondo, 1992 Paramount OS, 1990 Bianchi Mondiale, 1988 Colnago Technos, 1985 RalieghUSA Team Pro, 1973 Holdsworth

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Chain Widths

Published dimensions from several reliable sources (YMMV):

Multi speed chains, from 5 to 8 speeds have inner width of 3/32? (2.38 mm).
Multi speed chains from 9 to 12 speeds have inner width of 11/128? (2.18 mm).

Outside width of the links:

5 & 6 speed – 7.8 mm (5/16 in) (all brands)
7 speed – 7.3 mm (9/32 in) (Shimano HG), 7.1 mm (9/32 in) (SRAM, Shimano IG)
8 speed – 7.3 mm (9/32 in) (Shimano HG), 7.1 mm (9/32 in) (SRAM, Shimano IG)
9 speed – 6.6 to 6.8 mm (1/4 to 9/32 in) (all brands)
10 speed - 6.2 mm (1/4 in) (Shimano, Campy), 5.88 mm (7/32 in) (Campy, KMC)

When I put a 14-28 5 Speed FW on my 1967 Peugeot PX-10 I put on a NOS first generation late 70's SedisSport chain. They worked great BITD but didn't shift well with this setup. I went back to an original Sedis chain an all was good.

I attributed the difference to the pins in the old chains, they were wider and caught on the sprockets when shifting up to larger sprockets.

In general, most of the newer 6-7-8 speed chains work well on older chainrings and FW sprockets. I've been using mostly SRAM PC48-58-68 chains and the newer SRAM PC850-870-890 chains for years.

I have encountered problems with some freewheel pulleys with only a little wear on them. I've had to file the widths of the tops of the cogs down on several of them to work smoothly with the slightly narrower newer chains.

So, the specs I posted above may not be completely accurate.

Things aren't always what they seem... Don't believe everything you think!

Chas. ;-)

Last edited by verktyg; 04-12-20 at 11:08 PM.
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