The Alter lockring is machined from 7mm thick 7075 T6 aluminum and installs using a Shimano/Sram 16-notch outboard bearing bottom bracket tool (like the Park BBT-9).

For use with cogs 14t and larger and fits any track hub with English lockring threading.

Not compatible with Campagnolo, Miche, Phil Wood, Mack or Mavic hubs.

Specifications

7075 AL construction

1.29 x 24tpi left-hand English-threaded

compatible with cogs 14t and larger

colors: black, silver, gold, pink, green, purple

weight: 12g