Single Speed Fixed Hub 20-36H Single Speed Hub, Bicycle Hub 700C Fixed Bike. This Fixie Hub is the most popular fixed gear hub in our shop, it has simple design, durable material, glossy apperance, exquisite baking craftsmanship. Surly Fixed Hub has many different appearance for your choice. Model No.: FH002, made by AL6061 for shell, AL7075 for axle, stainless steel screw. Parameter: O.L.D. F100 R120mm, sealed bearings F2 R2, weight 205/243 ±5g, spoke 20-24h, 32-32h, axle F 9mm R 10mm. Warranty period: 12 month, any problem after you received it please direct contact us.