Buy from a store
Choose fulfilment, a variant and a store offer to checkout.
⌘K
BLACKBEARING · Headset bearings
The right-size bearing to bring a notchy headset back to life.
$34.99
PriceIn stock, ready to ship
A single BlackBearing C100 headset bearing, 37 x 48.9 x 6.5 mm with 36/45° angles. It's the MR031 size used in some 1-3/8 inch headsets, including those on certain Cervélo and Factor frames.
Sold by Ashburton Cycles
Verified store
Price
$34.99
Dimensions
37 x 48.9 x 6.5 mm
Contact angle
36° / 45°
Cross reference
MR031
The BlackBearing C100 is a replacement headset bearing measuring 37 x 48.9 x 6.5 mm with 36/45° angles. It's the size known internationally as MR031, found in some 1-3/8 inch headsets, including those fitted to certain Cervélo and Factor bikes.
It's an angular contact bearing built for steering loads, with SAE52100 chrome steel balls and races, headset-specific seals and quality grease. BlackBearing is a French company that specialises in bike bearings and makes more than 50 headset sizes.
A worn headset bearing shows up as notchy steering, a knock under braking or a creak when you stand up. Swapping the bearing alone is often all it takes to make the front end feel smooth and tight again.
Home mechanics and workshops replacing a worn MR031 (37 x 48.9 x 6.5 mm, 36/45) headset bearing.
MR031 size
37 x 48.9 x 6.5 mm with 36/45° angles.
Angular contact
Built for the loads a headset sees.
Chrome steel
SAE52100 balls and races.
Sealed and greased
Headset-specific seals, ready to fit.
Every detail as listed by the manufacturer.
BlackBearing is a French company that specialises in bearings and parts for cycling, supplying both bike brands and workshops. Its headset range covers more than 50 sizes for 1 inch, 1-1/8, 1-1/4, 1-1/2 inch and Cannondale steerers.
BLACKBEARING · Headset bearings
The right-size bearing to bring a notchy headset back to life.
$34.99
In stockDimensions
37 x 48.9 x 6.5 mm
Contact angle
36° / 45°
Cross reference
MR031
Material
SAE52100 chrome steel
A single BlackBearing C100 headset bearing, 37 x 48.9 x 6.5 mm with 36/45° angles. It's the MR031 size used in some 1-3/8 inch headsets, including those on certain Cervélo and Factor frames.
The BlackBearing C100 is a replacement headset bearing measuring 37 x 48.9 x 6.5 mm with 36/45° angles. It's the size known internationally as MR031, found in some 1-3/8 inch headsets, including those fitted to certain Cervélo and Factor bikes.
It's an angular contact bearing built for steering loads, with SAE52100 chrome steel balls and races, headset-specific seals and quality grease. BlackBearing is a French company that specialises in bike bearings and makes more than 50 headset sizes.
A worn headset bearing shows up as notchy steering, a knock under braking or a creak when you stand up. Swapping the bearing alone is often all it takes to make the front end feel smooth and tight again.
Home mechanics and workshops replacing a worn MR031 (37 x 48.9 x 6.5 mm, 36/45) headset bearing.
MR031 size
37 x 48.9 x 6.5 mm with 36/45° angles.
Angular contact
Built for the loads a headset sees.
Chrome steel
SAE52100 balls and races.
Sealed and greased
Headset-specific seals, ready to fit.