This lock ring is required to attach a center-lock brake disc to the corresponding hub with 15 or 20 mm thru axle. A tool is required for mounting, which is also used when mounting external bearing shells (Shimano, SRAM bottom bracket).
Product safety information
Manufacturer information:
BBB Cycling (Augusta Benelux B.V.)
Spaarneplein 2
Hague, Niederlande, 2515 VK
store@bbbcycling.com
https://www.bbbcycling.com