The FSA MR055 (TH-373) is a 1" angular contact headset bearing built to deliver smooth rotation and reliable load handling. With a 36°×45° ACB profile and precise 27.2 × 38 × 6.5 mm sizing, it fits a range of 1" integrated and semi-integrated headset systems. Designed for durability and consistent steering performance across road, gravel, and MTB frames using this specification.
