Originally Posted by
Bontrager
The rim is a 2006 Mavic Ksyrium SL SCC.
I believe heirin lies your answer.
IIRC, most Mavic wheels need a spacer, even with a 9 speed cassette. Then if you use a9/10 speed wheel with a 10 speed cassette, you need another spacer for the 10speed cassette.
I stand to be corrected, but that is my recollection of how Mavic 9 speed wheels work with 10 speed cassettes.