M MATI Rear Brake Disc Rotor for Polaris (Part 5248250) — SUS 420 Stainless, Heat-Treated

M MATI rear brake disc rotor is a direct-fit replacement rotor machined from high-strength SUS 420 stainless steel to restore braking performance on a wide range of Polaris ATVs and UTVs.

This rotor (Manufacturer Part # 5248250) replaces worn, warped, or damaged rear brake discs on many Polaris vehicles including Ranger, RZR, Sportsman, ACE, GEM, Brutus and others. It’s produced to OEM-style dimensions and heat-treated to resist distortion under repeated braking, giving a dependable, long-lasting stopping surface that works with factory calipers and pads.

Will this rotor fit my Polaris model and year?

Compatibility covers numerous Polaris models and production years; check the exact model/year list before ordering. The part fits many Ranger, RZR, Sportsman, ACE, GEM, Brutus, Hawkeye, LSV and M1400 applications—see your vehicle’s model and year against the fitment table.

• Includes Ranger 400/500/570/700/800/900/1000 series and Diesel/EV/ETX variants.
• Covers RZR 570 and 800, multiple Sportsman and ACE years.
• Also fits GEM EM1400, Brutus HD series and other specified models.

How is this rotor built to handle heavy use?

The disc is fabricated from SUS 420 stainless steel, then heat-treated to a hardness range that increases resistance to wear and heat-induced warping. That combination yields a durable friction surface and consistent rotor geometry under repeated braking loads.

• SUS 420 stainless construction for corrosion resistance and strength.
• Heat-treated to approximately HRC 34–38 to reduce blade deformation.
• Manufactured to OEM-style dimensions for correct caliper alignment.

What installation and maintenance should I expect?

Installation is straightforward for anyone comfortable removing a wheel and brake caliper; the rotor is designed to mate with stock hubs and hardware. Routine checks for pad wear, rotor surface condition, and fastener torque will keep the brake system functioning reliably.

• Replace with factory-recommended bolts and torque specifications.
• Inspect rotor for scoring or runout during pad replacement.
• Break in new rotors with light stops after installation for best pad seating.

What warranty or support comes with the rotor?

M MATI provides one year of product support for defects or issues reported after purchase. If the rotor shows manufacturing faults within the service window, contact the seller for assistance and resolution.

• One-year product service for manufacturing issues.
• Contact channel available for replacements or problem resolution.
• Sold individually—package includes one brake rotor.

Who is this for? This rotor is aimed at Polaris owners, mechanics and fleet operators who need an OEM-dimension replacement part that resists heat and wear. If you maintain or restore off-road vehicles used for work, recreation, or utility tasks and require a robust, direct-fit rear rotor that pairs with factory calipers and pads, this M MATI rotor is designed to meet those needs.