Can I use an XD cassette on an XDR body (and vice versa)?
One way only. An XD cassette (MTB) can fit on an XDR body by adding a 1.85 mm spacer. The other way around, an XDR cassette (road) will NOT fit on an XD body because it is 1.85 mm wider.
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Search on AmazonRelated questions
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- Yes Can I fit an old Campagnolo 11-speed cassette on an N3W body?
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Source: SRAM. Indicative data — always check the manufacturer's official specs.