Originally Posted by Dave Mayer

This is classic & vintage? Makes me feel old..

Anyway, this Campagnolo trick is one I've used successfully consistently on many drivetrains, including one I was riding yesterday:

• 10 speed Ergopower shifters (any)
• Older Campagnolo rear derailleur (1991-2000 vintage)
• Shimano 10-speed cassette (cheaper and more easily accessible).

Works perfectly every time. The Campy 10-speed shifters (best ever) pull on average 2.8mm of cable per 'click'. The old Campagnolo derailleurs have an actuation ration of 1.43:1. This is lower than the newer Campy actuation ratio of 1.50:1.

2.8 x 1.43 = 3.95mm, which matches Shimano 10-speed cog spacing. Campagnolo 10-speed cog spacing is 4.15mm - on average.

I know - there are small spacing differences across the Campagnolo cassette, and the shifter cable pull. But this hacks provides perfect shifting on every cog every time.