GOLDIX DH350 Downhill MTB E-Bike Hub Heavy Duty J-Bend 32H 36T Ratchet Disc Brake Mountain Bike Hub HG XD MS 10-12 Speed Boost

GOLDIX originates from China's largest bicycle hub manufacturer. We offer a comprehensive range of models and specifications, backed by strong technical expertise.We invite you to purchase our products. We also provide customization services for non-standard designs.Please feel free to contact us with any questions!Brand: GOLDIXModel: DH350DH (Downhill): An e-MTB wheelset designed specifically for downhill and heavy-duty off-road riding, featuring a 32-hole ratchet system and a heavy-duty 36T ratchet optimized for downhill use.Freehub Body Type: HG / XD / MSFront Hub Spacing: 110x20mm (Boost) / 110x20mm (Standard)Rear Hub Spacing: 157x12mmBrake Type: 6-Bolt Disc BrakeSpokes: Steel spokes, 32 holesBearing Brand: Taiwan SSFront Hub Bearings: Hub shell 6804 x2Rear Hub Bearings: Hub shell 6902 x2 / Freehub body 6802 x2Max Spoke Tension: 2500NWater/Dust Resistance: IP42–IP53Ratchet System: All-new 36T ratchetWeight: Please refer to product images (a variance of ±10g may occur between batches; placing an order constitutes acceptance of this term).Freehub Type Guide: (Note: Please confirm your drivetrain system and required freehub model before purchasing! Otherwise, installation will not be possible.)HG: Compatible with Shimano 10–12 speedXD: Compatible with SRAM 11–12 speedMS: Compatible with Shimano 12 speedProduct Features: The all-new GOLDIX DH350 series features a comprehensive upgrade to the ratchet engagement structure.Compared to standard ratchets of the same weight and tooth count, the new ratchet increases engagement surface area by 38%,significantly boosting load-bearing capacity and ensuring more stable power transmission. The ratchet teeth are arrangedin a uniform, concentric pattern. The force distribution in the standard design follows a flat, block-like, ring-shaped path, with stress levels around 630 MPa. In contrast, the GOLDIX new-generation ratchet features a beveled, base-circle-guided tooth profile, directing forces along a centripetal conical path. This guidance design allows the pawl to engage the tooth slots more smoothly and precisely, resulting in faster engagement, significantly reduced free-play, and more direct power response; it also enables automatic realignment to the concentric position. During operation, the ratchet maintains stable alignment along the axis, effectively minimizing misalignment and enhancing engagement stability. With stress levels around 480 MPa—observed under a simulated 230 N·m torque load—the peak stress is reduced by approximately 32%. Under identical operating conditions, the GOLDIX new-generation ratchet offers a significantly longer service life than standard 36T flat ratchets.