Boss Bearing 50-1207C Rear IRS Knuckle Combo Kit Polaris Sportsman Scrambler 550 850 1000 XP

The Boss Bearing 50-1207C Rear Independent Suspension Knuckle Combo Kit delivers one of the broadest fitments available for Polaris ATV rear suspension repair, covering the Sportsman 550, 850, and 1000 XP, Scrambler 850 and 1000 XP, Sportsman Forest, and Sportsman Touring across model years 2009 through 2025. The rear knuckle is a critical structural component of the independent rear suspension system — it connects the wheel hub to the suspension arms and controls the geometry that determines how your machine tracks, corners, and absorbs terrain. A bent, cracked, or worn knuckle throws off wheel alignment, causes uneven tire wear, and can make the machine feel unstable or pull to one side under load. This kit supplies the knuckle component only, making it the right choice when the bearings and hub are still in good shape but the knuckle itself has taken damage — common after impacts with rocks, stumps, or hard landings. Replacing just the knuckle restores correct suspension geometry and gets your machine back to riding the way it should, at a fraction of the cost of replacing the entire hub assembly.