The Topeak Zi:RAK Thru-Axle for SRAM UDH (Art No. TA2420-SP04) is a precision-engineered rear axle specifically designed to mount the Topeak Zi:RAK rear rack on bikes equipped with the SRAM Universal Derailleur Hanger system. Constructed from lightweight and durable aluminum, this 170mm thru-axle features a 12mm diameter and 20mm threaded section for secure rack attachment. The included spacers allow fine-tuned adjustment across frame types, ensuring perfect fitment and alignment. Ideal for gravel, road, or adventure bikes, it delivers stable and reliable rack installation while keeping total weight between 50-60 g. Optimized for SRAM UDH: Designed to integrate seamlessly with bikes using the SRAM Universal Derailleur Hanger standard. Durable Aluminum Build: High-quality aluminum construction offers a strong yet lightweight 50-60 g setup. Precision Fitment: 12mm diameter and 170mm length with 20mm thread section for exact alignment and stability. Rack Compatibility: Engineered for perfect connection with Topeak Zi:RAK rear racks to ensure vibration-free performance. Adjustable Spacers: Includes multiple spacers for customized installation across various frame geometries and axle standards. Manufacturer Sku: TA2420-SP04Todson Sku: 63102424