Wolf Tooth Performance Headset

This refers to the industry standard for your headset interface. The 'IS' stands for Integrated Standard, '52' is the 52mm inner diameter of your frame's head tube, and '40' indicates it is designed for a tapered steerer tube with a 40mm crown race seat.

The black oxide coating acts as a protective barrier against moisture and environmental contaminants. It significantly improves corrosion resistance, which helps the bearings last longer and spin smoothly, even if you frequently ride in wet or muddy conditions.

No, this specific lower assembly is engineered exclusively for tapered steerer tubes with a 40mm crown race. It will not fit a standard 1 1/8-inch straight steerer fork.

While these are sealed cartridge bearings, it is always best practice to apply a light layer of waterproof bicycle grease to the bearing seat in your frame before pressing the assembly in. This prevents creaking and makes future removal much easier.

This lower assembly weighs 45 grams. It is designed to be a durable, high-performance replacement that balances longevity with a lightweight profile.