SPECWORKS BMW G8X M SERIES REAR BRAKE DISCS — 2-PIECE FLOATING ROTOR — OEM REPLACEMENT

Direct OEM Replacement. Race-Grade Upgrade. Built For The G8X M Series.

Upgrade the rear brakes on your BMW G80 M3, G82 M4, or G87 M2 with the SPECWORKS 2-piece floating rotor — a direct OEM-size replacement engineered to deliver superior pedal feel, better cooling, and longer service life than the factory one-piece disc.

Direct bolt-on fitment — no caliper changes, no bracket changes, no compromises.

🔥 ROTOR — SPECWORKS 2-PIECE FLOATING DISC

• OEM-matched rear disc dimensions for direct fitment
• Two-piece floating construction — iron rotor ring + aluminium hat
• THERMACORE™ proprietary high-carbon iron alloy rotor ring — engineered in-house for superior heat management
• Optimised internal vane geometry for faster cooling
• Floating bobbin design accommodates thermal expansion under repeated hard stops
• Hard-anodised aluminium hat — corrosion-resistant and durable
• Serviceable design — replace the ring only when worn, keep the hat

❄️ SUPERIOR COOLING

The two-piece design physically separates the rotor ring from the hub via the aluminium hat, dramatically reducing heat transfer into the wheel bearing and hub assembly. Combined with the optimised vane geometry and THERMACORE™ alloy, the rotor sheds heat faster and stays within its ideal operating window — even under back-to-back hard stops.

🦶 PEDAL FEEL YOU CAN TRUST

The floating bobbin construction allows the rotor ring to expand naturally under thermal load — eliminating the pedal pulsation, judder, and distortion that plague one-piece OEM discs after repeated heat cycles. The result is a firm, consistent, and predictable pedal — lap after lap, stop after stop.

🛡️ DURABILITY THAT LASTS

Cast from our proprietary THERMACORE™ high-carbon iron alloy, the rotor ring is engineered specifically to resist:

• Cracking under repeated thermal cycling
• Warping and hard-spotting from hard stops
• Heat checking on high-temp track use
• Premature wear from aggressive pad compounds

Built to survive the abuse the OEM disc simply wasn't designed for.

🔧 SERVICEABLE BY DESIGN

Unlike OEM one-piece discs — where a worn rotor means a full replacement — the SPECWORKS 2-piece design lets you replace only the rotor ring when it reaches wear limits. The aluminium hat and hardware are retained, keeping long-term ownership costs down and reducing waste.

Buy once. Service when needed. Keep going.

🎨 CUSTOMISATION OPTIONS

• Rotor face pattern: J HOOK / Curved Slot / TY Slot
• Aluminium hat colour anodising: BLACK / BRONZE

📦 WHAT'S IN THE KIT

• 2 x SPECWORKS 2-piece floating rear rotors (L/R handed)
• 2 x Hard-anodised aluminium hats (pre-assembled)
• Floating bobbin hardware kit
• Fitment instructions

🔧 FITMENT

• Vehicle: BMW M Series (G8X chassis)
• Compatible Models:
  • G80 M3 / M3 Competition / M3 CS
  • G82 M4 / M4 Competition / M4 CS
  • G87 M2
• Years: 2021 – Present
• Position: Rear axle
• Caliper: OEM rear caliper

⚠️ Note: This kit is designed for models fitted with the standard steel rear disc. Not compatible with vehicles equipped with the optional Carbon Ceramic Brake (CCB) package.

📋 SPEC QUICK REFERENCE

🛡️ SPECWORKS PROMISE

Every SPECWORKS rotor is engineered in-house on our own CNC equipment and cast from our proprietary THERMACORE™ alloy — developed exclusively for high-performance braking applications. Race-proven technology, delivered worldwide, backed by our team.