FLASH™️ Road Bicycle Disc Brake 4 Pawls Silent Hub 21/24Holes

1. Shimano Road (HG) 11S works with 11/12-speed cassette directly or 8/9/10-speed mountain cassette with a spacer(s) .
2. Shimano MTB (HG) 10/11S works with 8/9-speed directly or 10-speed with a spacer or 11-speed road cassette if one of the inner cogs removed.
3. Campagnolo (Campy) 11S works with 9/10/11/12-speed Campy cassette with no spacers required.
4. Sram XDR could run XDR (road) cassette inherently and is compatible to run mountain bike XD cassette with a 1.85mm spacer.
5. Shimano Micro Spline (MS) works with 12-speed MS cassette only.