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Should I use spacer on CS-7800 who is being installed on WH-7900 ? Or just install the cassete without 0.5mm spacer ?

Cheers and thank you..

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up vote 1 down vote accepted

Shimano Dura Ace wheels do not require the extra spacer behind the cassette that every other wheel requires. So, no the 7900 wheel should not require a spacer with the 7800 cassette.

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Ok I will try, where did you get the info ?...thanks – Rick Ant Jan 25 '12 at 6:21

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