HUB RR DT 240 MTB 28x157x12mmTA MICROSPLINE RATCHET EXP SUPERBOOST 6B BK (L) The new 240 MTB series featuring new EXP ratchet technology (rear only). Newly redesigned press-fit end caps allow easy tool-free maintenance and conversion. Contact free seals and high precision build guarantee smooth bearings. Large surface contact area of ratchet provide improved durability and reliability. Item Specifications: Material: Aly, Color: Blk, Brake Type: 6B, Use: RR, Hub Drilling: 28H, Spacing / Axle: 12TA, Gears: 11-12s Micro, OLD: 157,