SUPERSPROX REAR SPROCKET ALUMINUM 49T-520 BLK KTM/HUS SUPERSPROX P/N: RAL-990-49-BLK Interchangeable P/N: 107-990149 Fitment: KTM/HUSQVARNA 125/150/250/300/350/450/500/501 - Message seller for direct fitment. Features: 7075-T651 Aerospace aluminum. The strongest commercial grade aluminum chosen for maximum tooth strength to offer extended sprocket and chain life. 100% surface anodized finish. Critical to prevent oxidization caused by untreated aluminum. Helps prevent the sprocket becoming loose on the wheel. CNC machined to provide perfect fitting to the bike hub. CAD design allows the maximum removal of weight, while keeping core strength. Grooved to prevent dirt build up under chain and prolong chain life. Factory tooth design, developed with factory teams. The wider and stronger tooth provides up to 20% longer sprocket life. Larger tooth radius reduces chain friction and extends chain life Please ensure fitment prior to purchase. Item will come in original packaging. If you have questions, please contact the seller. Not responsible for improper or ill fitment due to incorrect year, make & model given by buyer upon purchase.