The Surly Ultra New Singlespeed Rear Disc Hub is a no-nonsense, ultra-reliable hub built for singlespeed setups with disc brakes. Featuring a 135mm rear spacing, 10mm solid axle, and compatibility with standard thread-on freewheels, it’s perfect for mountain bikes, commuters, or utility builds. The high-flange aluminum shell and sealed cartridge bearings ensure long-term durability and smooth rolling. With 6-bolt disc compatibility and 32-hole lacing, it's a versatile choice for tough, low-maintenance rides.