Park Tool Chainrng Lockring Tool Option:LRT-4 Specially treated DARTs don’t just

Specially treated DARTs don’t just plug large slices and punctures in your tires

combined with deep race grooves in these bearings provide greater lateral support for the twisting and multi-directional forces associated with mountain bike pivots

it's about grip

(They really do work incredibly well with a phone

20mm Boost and Torq

Park Tool Chainrng Lockring Tool Option:LRT-4 Specially treated DARTs don’t justPrecisely machined for a perfect fit, the LRT 4 removes and installs lockrings found on many Shimano direct mount chainring systems. Features a 36 mm hex fitting for use with the Park Tool TWB 36 Crow Foot and a torque wrench (each available separately) to achieve proper torque. Precisely CNC machined from 6061 aluminum for a perfect fit and to prevent marring expensive parts, with a machined flat face for optimal lockring engagement.