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Campy cog spacing(2 posts)

Campy cog spacingbeamrider
Sep 27, 2001 5:35 AM
Good morning:

I just picked up a used 1998 Bianchi Eros with a Campagnolo 8 speed drivetrain, Avanti shifters, Mirage rear der., with Campy cogs and freehub.

The rear cassette does not synchronize with the shifter cable pull. The spacing between the cogs is less than the amount of cable pulled at each shift position making it impossible to index the rear derrailer for proper shifting.

The cog spacing center to center is 5.2 mm and the spacers between the cogs, which are plastic, measure 3.3 mm. The chain is a Sram pc48.

I'm not all that familiar with Campy products and do not know if the cog spacing is wrong or the shifter is incompatable with this cassette, but as you shift up the cogs it's obvious that the derailler is moving progressively farther past each cog with every shift until it jumps the chain past a cog at about the middle of the cassette and continues to move farther out of alignment with each shift.

I had same problem with another bike that had Campy shifters with a Shimano cassette. I had to buy a Wheels Manufacturing cassette consisting of Shimano cogs with Campy spacing that I know several of you are familiar with.

What is the cog spacing supposed to be on a Campy 8 speed cassette and are there different spacings available? I wouldn't think so. I also assume that the cable pull on any Campy shifter would be the same within a given model: 6, 7, 8, 9, or 10 speed. Any enlightenment would be appreciated.

This ones got me stumped.
re: Campy cog spacingRusty Coggs
Sep 27, 2001 4:50 PM
Campy 8 speed spacing is 5.0mm c-c of cogs. Cog thickness is 1.9mm and spacer thickness is 3.1mm. My reference does not show any index cog spacing or spacer thickness as you describe.They are all narrower.Got me stumped too.......