Title CR1 Crank Spindle Precision Spindles. Stable Platforms. The Title CR1 platform is modular by design, and the spindle is the component that enables compatibility across diverse bike platforms. This system allows a single set of CR1 arms to fit almost any frame. Simply select the width that corresponds to your specific frame and drivetrain requirements, attach your CR1 arms, and you are ready to ride. Every width is engineered to the same strength standard, ensuring that your choice is based solely on fit rather than durability. Crafted from 7075 T6 aluminum offered in high black polish finish throughout, there is no weight penalty, regardless of the configuration. Whether you are running a Boost trail bike or a gravity-focused downhill rig, there is a spindle length perfectly sized for your bottom bracket shell. 7075-T6 aluminum construction gives you the same material used in the CR1 arms, so the spindle is never the weak link in the drivetrain Three length options cover the full range of modern MTB frame standards: 130mm for dirt jump and Boost bikes, 136mm for most modern trail and enduro bikes with DUB Boost spacing, and 145mm for downhill bikes29mm SRAM DUB interface seats directly into any SRAM DUB 29mm bottom bracket shell, keeping bearing preload and chainline consistent with your existing setup High-polish black anodized finish resists corrosion and holds up to repeated removal and reinstallation when you move the arms between builds Verified weights by length keep the scale honest: 130mm spindle is 104g, 136mm is 107g, and 145mm is 113g, every gram counts | Title | Cr1 Crank Spindle 136X29Mm, Sram Dub