Whats the difference between the shimano SRAM and SRAM XDR options?
Hi Katie, The difference is the freehub driver. The Shimano/SRAM option takes Shimano and SRAM HG cassettes (11 and 12-speed). The SRAM XDR option takes SRAM's XD-R road cassettes, such as 10-33 and 10-36 that start on a 10t sprocket. Pick the one that matches your groupset's cassette. Many thanks Joe W





