The AltRider Rotor Guards keep your rotors protected from unintentional hits; a new KTM rotor can cost over $120 to replace. Keeping unsprung weight to a minimum on both the front and rear is critical for the suspension to react quickly to terrain. Our front rotor guard only adds 13 oz (0.36 kg) and the rear adds a minimal 6 oz (0.17 kg) in weight because it replaces the rear brake hanger for a well-integrated system for true structural support. By removing any unnecessary material we have one of the lightest guards on the market that minimizes surface area for mud to stick to. Not only are the AltRider KTM Rotor Guards lightweight but they are engineered to optimize strength by fastening to the bike at the most secure points. Front Rotor GuardThe front fastens to the robust 22 mm axel maximizing strength & stiffness. It replaces the left side spacer with a strong 8.5mm thick hub mount while maintaining the critical seal at the wheel bearing. The guard mounts to the hub with 2 M6 fasteners and uses 3 points of positive engagement. This creates maximum protection against lateral hits and the support beams provide protection against direct hits. The guard covers the leading edge of the rotors along the front and bottom where your most likely to endure a hit. We avoided using the axel screw as it‚ a light duty aluminum fastener with fine threads we also avoid the caliper bolt for mounting. They were never intended to have impact forces applied to them and wouldnt be able to withstand a direct hit. Additionally we do not utilize the front axle clamp bolts as they cannot provide structural support. Font Guard Fitment/22mm axle fits:/KTM: 2015 SX/SXF/XC/XCF./KTM: 2016Current All Models 125-500/Husqvarna: 2016Current 125-501 All Models/ GAS GAS: 2021Current All Models