Riders and mechanics replacing a worn 1.5 inch headset bearing of this 40 x 52 x 8 mm, 45° x 45° size.
This is a sealed headset bearing for 1.5 inch headsets: 40 mm inner diameter, 52 mm outer diameter and 8 mm wide, with 45° x 45° angles on the races and a red dust seal.
The angles matter as much as the size. A headset bearing seats against angled faces in the cup and crown race, so match the 40 x 52 x 8 mm size and the 45° x 45° angles to your existing bearing before ordering. The red dust seal also makes it easy to identify.
40 x 52 x 8 mm size
Inner diameter, outer diameter and width.
45° x 45° angles
Angled races that seat against matching faces in the headset.
Sealed bearing
A sealed bearing keeps grease in and dirt out.
Red dust seal
Easy to identify at a glance.
Bearing
Great for
Maybe not for
Read the size and angles printed on your old bearing, or measure it. This one is 40 mm inside, 52 mm outside and 8 mm wide, with 45° x 45° angles.
Match the angles as well as the size
Two headset bearings can share the same 40 x 52 x 8 mm size but have different angles, and a bearing with the wrong angles will not seat properly. Check both numbers on your old bearing before you order.
