Trek Session Headset Bearing Kit - FSA/ Standard Options 2011 It actually cleans your chain

It actually cleans your chain as you ride

Grizzly Standard Kit 10 Standard Bearings over 3 different sizes (8 out of 10 bearings will be MAX bearings)

RATCHET TOOL MATERIAL: Chrome vanadium steel

(for hubs with axle stops)

They are always engineered with the largest balls possible and dual lip seals riding in a micro groove for ultimate protection against sweat and the elements

Trek Session Headset Bearing Kit - FSA/ Standard Options 2011 It actually cleans your chainTrek Session Headset Bearing Kit FSA Standard Options This Headset Bearing Kit fits all Trek Session models. The kit contains two bearings of two different sizes in the following options. FSA (Full Speed Ahead) Kit (The OG Bearings used by Trek) FSA headset bearings are high quality, precision engineered components designed to deliver smooth steering and long lasting performance for both road and mountain bikes. These Angular Contact Bearings (ACB)