Can I swap 10 sp / 9 sp cassettes?

Triathlon Forum
1

I’ve got a 5-year-old wheel (Bontrager) with a 9-speed cassette. Can I put a 10-speed cassette on it? Anything special I need to do?

2

Probably. You may need a 1mm spacer behind the 10-speed cassette - I know you do with most Shimano hubs anyway.