Campagnolo

Can I use a 10-speed rear derailleur with a 9-speed drivetrain?

VeloNews technical writer Lennard Zinn is a frame builder, a formerU.S. national team rider and author of several books on bikes and bikemaintenance. This is Zinn's weekly VeloNews.com column devoted to addressingreaders' technical questions about bikes, their care and feeding and howwe as riders can use them as comfortably and efficiently as possible. Readerscan send brief technical questions directlyto Zinn. We'll try to print a representative sample of questions ineach column.Follow-up from previous discussions:There was plenty of input from readers on the subject of mixing

Can anyone else use Campy shifters with Shimano cassettes?

Why can't I get my drivetrain to shift well?

What's an alternative to Rohloff chains on Campy drivetrains?