Cane Creek AER II Series Headset Bearing - Blue - Steel-Aluminium - 1 1-8 Inch - 30.15x41x6.5mm - 36x45 - IS41 PDP|Colour This is not ideal for

This is not ideal for bikes with dropper posts

This option combines a smooth modulating pad compound with a cooling finned backplate to provide consistent powerful braking in all conditions

10s Cassette Compatibility:

Manufactured in the US of A out of top quality 7075-T6 Alloy and Type II anodised

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Cane Creek AER II Series Headset Bearing - Blue - Steel-Aluminium - 1 1-8 Inch - 30.15x41x6.5mm - 36x45 - IS41 PDP|Colour This is not ideal forGenuine Cane Creek AER II Bearing. Made from Steel and Aluminium for the lightest possible bearing. Even though it manages to shave a whopping 35% off the weight of a standard bearing, it still maintains the quality and durability that Cane Creek bearings have become known for. The best part is, these are cross compatible between all of Cane Creek's other headsets! So you can upgrade your Ten, Forty or 110 series headset to have AER II bearings.