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I want to install a CS-HG800-11 cassette on my Zipp 303s wheelset. The cassette comes with a low spacer (Y4T724000) and I am not sure whether I need it and if so which way should I put it on the freehub body? On side of the spacer is flat the other one is not. Help would be nice!

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You don’t say what size the cassette is but presumably it is a wide range model.

11 speed compatible freehub bodies are 1.8mm longer than 8-10 speed ones. Some wide range 11 speed cassettes can fit on a 10 speed freehub because the the large diameter inner sprockets can overhang the inner end of the freehub body a little and clear the drive side flange and spokes. Such cassettes come with a 1.8mm spacer for installation on a 11 speed freehub.

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  • Thanks for your answer! Sorry. it is a 11-34 cassette. – ruedi Nov 4 '20 at 12:11
  • Yep, 11-34 will need the spacer. – MaplePanda Nov 4 '20 at 16:19
  • ...unless it's a pre-11-speed 303.. – Nathan Knutson Nov 5 '20 at 2:02

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