Surly Stainless Steel Lockring
CNC-machined from premium stainless steel...no flaking chrome or rusting. We've improved the design to increase thread contact. It's now a full 5mm thick, plus a lip (.65mm extra) to maximize thread contact on all compatible hubs. Fits English lockring threads (1.29x24tpi) to work on almost all track hubs available today except Campagnolo (1.32x24t LH) and French (33x1mm LH).