DT Swiss 240 EXP Rear Hub - 12 x 142mm Center-Lock Micro Spline BLK/Red 24H 36ptRatchet EXP (36t) features a fused threaded ring ratchet and single spring, reducing the number of components for a lighter and more durable freehub system Integration of drive side bearing into threaded ring widens bearing stance, resulting in 15% greater hub stiffness With DTs ratchet system, all of the teeth on each side of the ratchets engage simultaneously every time. This creates much smaller point loads and results in the legendary reliability