Zipp Centerlock Internal Threaded Lock Ring

SRAM and Zipp offer rotors and wheels, respectively that are compatible with the Center Lock disc rotor mounting system developed by Shimano. Center Lock offers a secure hold and perfect fit with fully compatible rotors that makes it simple to remove and install a rotor. Most road and gravel disc brake wheelsets feature the Center Lock spline system. These Zipp Center Lock Disc Lock Rings are what is referred as the external serration design, and meant to interface with a 16T/44-45mm (OD) external bottom bracket tool. Zipp is offering two versions, one for 140mm and 160mm rotors (common for road and gravel bikes), and a second for rotors from 170-203mm sizes (most common on mountain bikes). Both are machined from aluminum and feature a floating stainless steel washer on the hub interface side. Features - Center Lock disc rotor lock ring with external serration (tool interface) - Tool interface is a 16T/44-45mm (OD) type used on external bottom brackets - Compatible tools: Park BBT-9, Park BBT 69.4, Shimano TL-FC33, Chris King and many others - Machined aluminum body and threading - Floating stainless steel washer - Rotor size options: 140-160mm, 170-203mm (listed as 180mm in the selection menu) - Color: Anodized Black - Weight: 8.1 grams (140-160mm)