Campag 9 Speed Cassette Types

[allenh]

This has been very interesting and informative gents and has lead me to another question. is the sprocket thickness and spacing the same for both the old and new 9 speed cassettes?

Going through my parts box yesterday I found a pair of early pre 99 brifters that I had assumed were 8 speed but are in fact 9 speed so am wondering if I can use them with the current 9 speed cassettes?

 

[BigFoz]

They're different. Fractionally. IIRC, using them mismatched means it skips a sprocket going up and a different one coming down - ergo you can get all the gears, you just sometimes have to goup then down, or down then up. IIRC it's the 3rd from biggest going up and 2nd/3rd from smallest coming back down that can be problematic. I could dial it in perfectly on the stand, but soon as I was in the real world, the misses came back. I think one or the other has a single different sized spacer - can't recall which, I just make very sure I line them all up in the exact order, even when swapping sprockets to make custom cassettes. I think there are some cut away diagrams that explain the differences in the tech manuals if they're still online.

 

[allenh]

They're different. Fractionally. IIRC, using them mismatched means it skips a sprocket going up and a different one coming down - ergo you can get all the gears, you just sometimes have to goup then down, or down then up. IIRC it's the 3rd from biggest going up and 2nd/3rd from smallest coming back down that can be problematic. I could dial it in perfectly on the stand, but soon as I was in the real world, the misses came back. I think one or the other has a single different sized spacer - can't recall which, I just make very sure I line them all up in the exact order, even when swapping sprockets to make custom cassettes. I think there are some cut away diagrams that explain the differences in the tech manuals if they're still online.

Thanks for that. I'll have to have a look through the manuals I have and can find online to see if I can work out how to space them.
I've done it mixing Shimano cogs and Campag spacers using the info on Sheldons browns site about cog and spacer thickness to get 8 speed Campag brifters to work on Shimano hubs, but I don't remember seeing the earlier Campag info there but I'm sure I'll get there with these.