The rear hub features a custom silicone lip seal for the endcaps to protect the drive mechanism and Teflon contact seals to protect the outboard bearings; Compatible only with torch hubs and wheelsets; Compatible only with torch MTB and fat bike hubs, not compatible with road or CX disc hubs; Includes two end caps; this end cap + adds 7 mm to the overall Old – 135 mm hubs become 12 x 142 mm, 170 hubs become 12 mm x 177 mm and 190 hubs become 12 mm x 197 mm