Giant Defy Advanced Pro Headset Bearing Kit headset-bearing-kit-mondraker-prime-x-2021-esi3709567 5 Different Part ref's)

5 Different Part ref's)

For all Planet X Pro Carbon Bikes

4 Different Part ref's)

fits 2012-2021 model years only

Giant Defy Advanced Pro Headset Bearing Kit headset-bearing-kit-mondraker-prime-x-2021-esi3709567 5 Different Part ref's)This listing includes both the upper and lower headset bearings, two bearings included in sale. For Giant Defy Advanced Pro bikes, compatible with all model years. Upper Bearing MR136 Lower Bearing MR137 GCR15 High Carbon Chromium Bearings: Chromium offers a corrosion resistance to the bearing, allowing you to get more use out on the trails and less time in the workshop changing bearings again due to rust and seizing. Buna NitrileRust Resistance