CEMA ACB Headset Bearing
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The CEMA ACB headset bearing is the replacement to fit when your bike's steering has play, feels notchy or turns with friction. This size, 41.8 x 30.5 x 7.7 mm with a 45°/45° angle, is for replacing a bearing with one of the same dimensions.
It is made from chrome-plated steel with a double seal, meaning two seals that help protect the bearing from dirt. The colour is silver-black. To choose, compare the outer diameter, inner diameter and height with those of your headset, then check the angle: 45°/45° indicates two cups with the same angle, so this must be checked against your frame. If you are unsure of the dimensions, measure before ordering.
| Type | Headset bearing |
|---|---|
| Material | Chrome-plated steel |
| Outer diameter | 41.8 mm |
| Inner diameter | 30.5 mm |
| Height | 7.7 mm |
| Angle | 45°/45° |
| Seal | Double |
| Colour | Silver-black |