Which cassette spacer?

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uclown2002

Guru
Location
Harrogate
The first link if you're fitting a 10 sp shimano cassette.
 

uclown2002

Guru
Location
Harrogate
Shimano 8, 9 & 10 Speed Cassette Compatibility With 11 Speed Freehub

The Dura-Ace CS-9000 & Ultegra CS-6800 HG-EV 11 Speed Cassette is 1.85mm wider than a 10 speed HG cassette, therefore the freehub dimensions have been adjusted accordingly. In order to mount a CS-9000 or CS-6800 HG-EV 11 speed cassette, an 11- speed wheel must be used.

When mounting a 10 speed cassette on the new 11 speed freehub design 2 spacers are required. Firstly a 1.85mm spacer which is supplied with the wheel, secondly a 1mm spacer which is supplied with the cassette.

To run a 8 or 9 speed cassette, only the 1.85 spacer is required.
 
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