Sealed Bearings

Inner x Outer x Depth (mm): 30.2 x 42 x 7
Inch Dia: 1-1/8”
Angle / Chamfer (Deg): 1 x 45 Deg Chamfer on Inner Race
Used on: Pinarello Headsets / Acor

ACB30418K Headset Bearing

Found in 'some' Acros Headsets

Inner x Outer x Depth (mm): 30.1 x 41.8 x 8
Inch Dia: 1-1/8”
Angle / Chamfer (Deg): 36 / 45

Inner x Outer x Depth (mm): 30.05 x 42 x 7
Inch Dia: 1-1/8”
Angle / Chamfer (Deg): 36 / 45
Material: Chromium Steel

TH Industries/FSA Part ref's: MR040, TH873/DJ, 160-0300000000 

Inner x Outer x Depth (mm): 30.2 x 41 x 7.1
Inch Dia: 1-1/8”
Angle / Chamfer (Deg): 36 / 45

ALSO KNOWN AS: MR049, 160-6475, TH-872, 160-0016000000
Search site for 'TH872' to find non FSA direct alernative

Inner x Outer x Depth (mm): 30.2 x 41.5 x 6.5
Inch Dia: 1-1/8”
Angle / Chamfer (Deg): 36 / 36
Made by FSA

Inner x Outer x Depth (mm): 27.2 x 38.5 x 6.5 
Inch Dia: 1”
Angle / Chamfer (Deg): 36 / 36
Made by FSA

Inner x Outer x Depth (mm): 30.15 x 41.7 x 7.8
Inch Dia: 1 - 1 / 8”
Angle / Chamfer (Deg): 36 / 45
Made by FSA

ALTERNATIVE PART NUMBERS: MH-P03K,  MR122, MR054
FSA PRODUCT CODE: 160-0014000000 (Was 160-1648)

In long description, scroll to bottom of page to see direct fit alternatives.

Inner x Outer x Depth (mm): 30.15 x 41 x 6.5
Inch Dia: 1 - 1 / 8”
Angle / Chamfer (Deg): 36 / 45
Made by FSA

UPPER BEARING FOR GIANT OD2 (OVERDRIVE 2) HEADSETS FOR BOTH ROAD AND MTB

Inner x Outer x Depth (mm): 32.8 x 41.8 x 6
Inch Dia: 1 - 1 / 4”
Angle / Chamfer (Deg): 45 / 45
Material: Chromium Steel

ALSO KNOWN AS: No.8/DJ, TH-870/DJ & 160-0031000000

If you have read part ref 'MR1551' from your bearing, then it is meant to read 'MR155 1-1/8' - see one of images attached. MR1551 doesn't exist

Inner x Outer x Depth (mm): 30.5 x 41.8 x 7.5
Inch Dia: 1 - 1 / 8"
Angle / Chamfer (Deg): 45 / 45
Single Seal
Made by FSA