Headset bearing, 19x30x6.5 mm (45x45o) This size bearing is also known in the bike Industry by part number: HD408K

Headset bearing, 30.2x42x7 mm (45o ID) Primary application for this bearing size is as a direct replacement on some Pinarello bikes.

Headset bearing, 33.15×46.9×6.5 mm (36x45o) This size bearing is also known in the bike Industry by part number HD408K

Headset bearing, 30.5×41.8×6.5 mm (45x45o) This size bearing is also known in the bike Industry by these part numbers: MR042, 870E, MR121, MR070, MR084, MR116, TH-870E, MH-P08

Headset bearing, 14.2x25x6.5 mm (45x45o) This size bearing is also known in the bike Industry by these part numbers: 307481, W 276442

Headset bearing, 27.15x38x6.5 mm (36x45o) This size bearing is also known in the bike Industry by these part numbers: HD 1320K, 428420, TH-373, MR055, BAA1159, MH-P09K

Headset bearing, 40x42x7 mm (45x45o)

Headset bearing, 1-5/16×1-3/4×9/32″

Headset bearing, 30.5×41.8×6.3 mm (36x45o)

Headset bearing, 30.2x41x6.5 mm (36x45o) This size bearing is also known in the bike Industry by these part numbers: 27287-1046-004, HSS0130K, TH-873E, MR-122