What is the difference between XD and XDR driver bodies? November 12, 2018 20:44 Updated XDR is 1.85mm longer than the XD. If you have an XDR driver body, you can make it XD compatible by adding a 1.85mm spacer. Related articles Do I need an XD or XDR driver to use an XD compatible cassette? Why did SRAM create the XDR driver body interface? What are the main benefits of the XD and XDR interfaces? Where do I get an XD or XDR driver for my wheel? Are XD and XDR open standards?