The HotRod is a do-it-all truck mount for bikes with 12mm x100mm, 15mm x100mm, and Boost 15mmx110mm thru-axles. RockyMounts CNC an aluminum body to accept our proprietary thru axles and include all three popular sizes. Simply undo the set screws and swap out the axles if you want to run a different size thru axle. The bodies are 6063 aluminum and anodized to a high luster. Perfect for home made and DIY racks.