Alloy Shimano Standard Freehub body for OOZY Trail R142/135, SPIKE R135/142, or SPIKE DH R150/157 Rear hubs. Compatible with all OOZY hubs and wheels. Compatible only with SPIKE and SPOON wheels (135mm and 150mm) produced in 2016 or later (with SPIKE hubs). Alloy freehubs save weight but do not have the same level of durability as steel models.