XD: Suits most SRAM 11/12 speed (not NX 11)

9mm diameter

The downside is they have less tolerance for heat

This includes the new SRAM CODE R

offer a lot of protection against impacts and come in Women specific sizing and last

Race Face Ambush Knee Guard - L - Stealth PDP|PLP|Brake Rotor Type XD: Suits most SRAM 11/12Be prepared for unexpected dirt excursions with the Ambush Knee Guard from RaceFace. Featuring D30 high performance shock absorbing foam these pads will feel nice and compliant during normal use, but then the magical foam stiffens up under impact to protect your bony bits if the trail tries to jump out at you. The pads are made from perforated neoprene and lined with a terry material for wicking and comfort. The pads feature an open back construction