StopFlex high-performance carbon ceramic brake rotor.

BMW i4 M50 (G26) Carbon Ceramic Brakes Kit

Email us your car model and wheel size. We’ll match you with the ideal kit and price!

Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.

About the Disc
Customer Cases

2022-2026 BMW i4 M50 (G26) Carbon Ceramic Brake Kits

The BMW i4 M50 (G26) is a heavy, very fast dual-motor Gran Coupe that can burn through speed repeatedly while still spending most of its life as a quiet daily. Buyers usually want a brake upgrade that cuts unsprung mass, keeps a clean wheel face, and stays confidence-inspiring on a mixed street/spirited-use EV. ([bmwi.bimmerpost.com](https://bmwi.bimmerpost.com/forums/forumdisplay.php?f=824))

Body style: Gran Coupe
Front rotor reference: i4 M50: 374mm, 395mm
Rear rotor reference: i4 M50: 345mm

This is an OEM-size replacement kit. The rotors are built to the factory rotor spec and install with the factory caliper when the front caliper is a fixed design and the rotor spec matches. The included pad shape matches the OEM pad shape. If the car uses aftermarket calipers such as Brembo, AP Racing, Alcon, or Wilwood, provide the exact caliper model and StopFlex can supply the matching pad shape. Direct replacement is not confirmed if the front caliper is floating, or if the car already runs a non-OEM-offset rotor and the actual rotor dimensions cannot be supplied.

Why StopFlex CCB

Lightweight

Half the Weight, Sharper Handling. StopFlex carbon-ceramic rotors shed roughly half the mass of equivalent iron discs. This massive drop in unsprung weight instantly transforms your chassis, delivering sharper turn-in response and a significantly more refined road feel.

High-Temp Resistance

Minimal Brake Fade at 900°C (1652°F). While traditional iron rotors severely fade under heavy track loads, our CCB matrix holds a stable 0.30μ friction coefficient even at 900°C (1652°F). You get consistent, predictable stopping power when things get dangerously hot.

Corrosion Resistance

100% Rust-Free Durability. Say goodbye to flash rust after a car wash or heavy rain. The carbon-silicon carbide material is naturally impervious to corrosion, ensuring your brake rotors look completely clean and pristine no matter the weather conditions.

Long Lifespan

250,000+ km (155,000+ mi) Lifespan. Iron rotors typically require replacement around 100,000 km (62,000 mi). In normal street driving conditions, a StopFlex CCB rotor can easily last 250,000 to 300,000 km (155,000 to 186,000 mi), effectively outlasting the vehicle itself.

Ultra-Low Dust

Ultra-Low Visible Brake Dust. Heavy black dust destroying your wheel finish is a thing of the past. When paired with our matched StopFlex pads, these rotors generate virtually zero visible brake dust, keeping your premium wheels spotless for much longer.

Premium Visual Finish

Premium Mirror-Like Finish. StopFlex utilizes a patented ceramic formula that cures with a distinct crackle pattern. The surface is machined dead-smooth for high reflectivity, providing a premium aesthetic behind open wheels under the right lighting.

High Normal-Temp Friction

Strong Initial Bite (0.40μ+). With matched StopFlex pads, normal-temperature friction can exceed 0.40μ for a firmer pedal feel and strong initial bite.

Long-Fiber Construction

Continuous Long-Fiber Strength. StopFlex utilizes a continuous long-fiber 3D matrix. This structure is significantly stronger and offers higher thermal conductivity than standard chopped-fiber OEM CCM discs.

Cold First-Stop Confidence

Reliable Cold-Bite at -20°C (-4°F). Coated street rotors still deliver normal first-stop braking at -20°C (-4°F). Uncoated motorsport rotors are the exception.

Important heat note

Carbon ceramic does not shed heat as fast as steel. Long hard driving can heat-soak the rest of the brake system, including fluid, seals, and nearby parts. Unless the car already has strong brake cooling, or you plan to upgrade brake cooling, prolonged aggressive driving is not recommended.

Rotor options

Street Spec

Ceramic coating + cross-drilled face + large cooling channels.

374 mm front / 345 mm rear is the cleaner choice for daily-driven i4 M50s that want lower dust and lighter feel without overcommitting to the biggest package.

Track-Day Spec

Ceramic coating + blank face + honeycomb cooling channels.

395 mm front / 345 mm rear is the better fit if your i4 M50 sees repeated fast-road or occasional track-style heat cycles and you want more thermal headroom.

Motorsport Spec

No coating + blank face + honeycomb cooling channels. Not for normal street use.

Use the 395 mm front-based setup for the most demanding work, but only after confirming caliper and wheel clearance on your exact car.

Pads

Item	Details
Pad shape	The included StopFlex pad shape matches the OEM pad shape used by the retained caliper.
Aftermarket calipers	Provide the exact caliper model and StopFlex can supply the matching pad shape.
Pad details	For compound details and pad-specific parameters, see the StopFlex Ceramic Brake Pad for CCB Rotor product page.

What’s included

Item	Included
CCB rotors	Full-car set
CCB brake pads	Full-car set
7075 aluminum floating rotor hats	Full-car set
Stainless floating hardware	Full-car set
Order scope	Default listing includes front set + rear set. Front-only or rear-only can be ordered separately.

FAQ

Can I upgrade my BMW i4 M50 (G26) to a StopFlex carbon ceramic brake kit while keeping the factory calipers, or do I need different calipers?

That depends on which factory brake package your i4 M50 already has, because this platform’s rotor sizes are linked to matching caliper hardware. Verify your current front size and caliper before ordering; if you are changing beyond your existing hardware spec, plan around the correct caliper fitment too. ([bmwi.bimmerpost.com](https://bmwi.bimmerpost.com/forums/showthread.php?t=2002329))

Which StopFlex carbon ceramic brake size is right for my BMW i4 M50 (G26): 374 mm or 395 mm front?

Choose the size that matches your current hardware first, then decide based on use. For mostly street driving, 374 mm is the simpler answer; for repeated hard runs and more heat margin, the 395 mm front setup is the safer buy. ([bmwi.bimmerpost.com](https://bmwi.bimmerpost.com/forums//showthread.php?t=2065274))

Is a StopFlex carbon ceramic brake kit on the BMW i4 M50 (G26) still pleasant for daily street use, especially on cold first stops?

For a daily-driven i4 M50, this is mainly about whether you want cleaner wheels and a more premium brake feel without giving up normal road use. If your car is mostly commuting with occasional spirited driving, stay with the street-biased size choice rather than over-sizing the package. ([bmwi.bimmerpost.com](https://bmwi.bimmerpost.com/forums/forumdisplay.php?f=824))

Does my BMW i4 M50 (G26) need extra cooling if I install a StopFlex carbon ceramic brake kit and drive it hard for long periods?

For normal street use, you usually buy this for cleaner, lighter-feeling braking rather than because the car needs added cooling hardware. If you do repeated high-speed stops or extended mountain driving, prioritize the 395 mm front-based setup and make sure wheel design does not choke airflow around the brakes. ([bmwi.bimmerpost.com](https://bmwi.bimmerpost.com/forums/forumdisplay.php?f=824))

Need fitment confirmation?

Send the exact vehicle details and current brake setup before ordering.

Brake Guides Confirm Fitment

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