25x37x7 mm The most common use for this bearing is as a direct replacement bearing for Shimano external cup BBs when using the plastic Shimano bearing insert. If you wish to avoid using the plastic insert MR 2437 is the correct bearing for the job.
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.
Headset bearing, 30.5x41.8x6.5 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, 40x52x7 mm (45x45o) This size bearing is also known in the bike Industry by these part numbers: HSS 6011, BAA0695K, TH-070, MR-128, MH-P16, TH MR082
ShimanoShimano 9
