Burgtec Thick-Thin Direct Mount Chain Ring - Shimano Direct Mount - 3mm Boost - Round - Bullion Gold - 12 Speed Shimano - 30T YGroup_7033437192237 FE Bearing - Flanged and

FE Bearing - Flanged and extended inner race

4 cartridge bearings per pedal

Other mounts can be purchased separately

the AE12 is skinnier and shorter

Steel bolts

Burgtec Thick-Thin Direct Mount Chain Ring - Shimano Direct Mount - 3mm Boost - Round - Bullion Gold - 12 Speed Shimano - 30T YGroup_7033437192237 FE Bearing - Flanged andKeep that chain in place where it should be with a Burgtec Thick Thin Chain Ring. Designed with a proven thick thin tooth profile for improved chain retention. Who's this item for: Riders who use 1x drivetrains and are looking for superior chain retention as well as durability. Weight: 0. 08g Pros: Wide range of tooth options. Works for 9, 10, 11, and 12 speed setups. Great build quality. Cons: Oval options not available in all mounting types.