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These boxes hold 700c wheels securely
Please not this kit does not come with the compression ring used on the modern version of the headset
*Model: 100/135mm
Complete replacement bearings for this bicycle / headset
Commonly used in Cannondale headsets
FSA Headset Bearing MR031 - (ACB IS-2-138, MR031S) Juliana These boxes hold 700c wheelsInner x Outer x Depth (mm): 37 x 49 (48. 9mm) x 6. 5 Inch Dia: 1 3 8 Angle Chamfer (Deg): 36 45 Bearing ID: 37mm Bearing OD: 49mm (sometimes listed as 48. 9mm) Bearing Thickness: 6. 5mm Internal Angle: 36 Degrees External Angle: 45 Degrees Fits Many Cervelo Road Bikes Lower Bearing also known as: 160 6753, IS 2 138, ACB6806CC and HD 1446 K. Stock may be FSA or BBB Branded. See ACB49H6. 5K as a direct alternative to this FSA product.