The build: BMW i7 G70 carbon ceramic brake spec
| Item | Specification |
|---|---|
| Vehicle | BMW i7 (G70) |
| Front setup | Factory M Sport multi-piston caliper with 405 mm STOPFLEX carbon ceramic rotor |
| Rear setup | Factory rear caliper with 380 mm STOPFLEX carbon ceramic rotor |
| Pads | Carbon-ceramic-compatible low-noise compound |
| Wheels fitted | 21-inch |
| Weight reduction | About 20 kg total versus the factory iron setup |
| Scope | Front and rear rotor upgrade, factory calipers retained |
Confirm before you order
This is a rotor upgrade built around BMW i7 G70 cars with the factory M Sport fixed multi-piston front calipers and 21-inch wheel clearance for the 405 mm front rotor. You keep the original calipers and all factory electronics. Send us your exact configuration so we match the front and rear package correctly.
What the upgrade does and what to check
| STOPFLEX feature | Why it matters on the i7 | What you notice |
|---|---|---|
| Rotors about half the weight of same-size steel | The i7 is a near-three-ton flagship, so every kilo of rotor mass hits both unsprung weight and rotational inertia at the corner | The suspension settles more cleanly over rough pavement and the front end feels a touch less heavy-footed |
| Rotors don't rust after rain or washing | An EV leans on regen for most slowing, so iron discs sit idle and surface-rust before they ever wear out | No orange rotor faces through the spokes, and none of the gritty first-stop feel after the car sits a few days |
| Very low dust with STOPFLEX pads | Big 21-inch wheels show every bit of brake grime, and washing a car this size is a chore | Wheels stay clean far longer between washes |
| Holds about 0.3μ surface friction at 900°C in testing | Stopping a heavy EV from speed dumps a lot of energy into the discs fast, and repeat stops stack the heat | More repeatable pedal feel when you're working the brakes hard, like a long descent |
| Long-fiber CCB construction, no track use | An EV that brakes mostly with regen barely wears its friction discs | Rotor life that can reach roughly 250,000 to 300,000 km on the street |
What gets better
- Around 20 kg less unsprung and rotational mass across the axles
- No more rusty rotor faces staring out through the wheels
- Cleaner wheels thanks to very low dust with STOPFLEX pads
- Steadier brake feel when heat builds on hard, repeated stops
- Long street life that suits a low-wear regen EV
What to confirm first
- That your i7 runs the factory M Sport fixed multi-piston front calipers
- Your exact G70 configuration, front and rear, so both rotor sizes match
- Wheel and clearance fit for the 405 mm front rotor on 21-inch wheels
- That you want to keep factory calipers and electronics, not swap the whole system
If you're not sure your car matches the spec shown here, send us your details and we'll confirm BMW i7 G70 fitment before you order through our BMW CCB collection.
Build Gallery
BMW i7 G70 carbon ceramic brake FAQ
Why bother upgrading the friction brakes on an EV that uses regen?
Regen does most of your everyday slowing, but it backs off when the battery is full, when you need a hard emergency stop, and when you're hauling speed down a long grade. That's all on the friction brakes. And because EV iron rotors get used so little, they tend to surface-rust. STOPFLEX carbon ceramic rotors don't rust after rain or a wash, stay cleaner, and are ready the moment the car needs real stopping power.
Will carbon ceramic rotors make my BMW i7 noisy or rough?
Not when the system is matched right. This i7 build runs carbon-ceramic-compatible low-noise pads and keeps the factory calipers, so the goal is to hold onto the refinement you expect in the car. Since the rotors don't oxidize after rain or washing, you also skip the gritty first-stop feel iron discs get after the car sits.
Does this i7 upgrade need new calipers?
No. It's a direct-fit rotor upgrade for BMW i7 G70 cars running the factory M Sport fixed multi-piston front calipers. You keep the original calipers, the factory hydraulics, and the electronic systems. Nothing about the car's braking software changes.
What do carbon ceramic rotors actually do for a heavy luxury EV?
Four things: lower unsprung and rotational weight, no rust, very low brake dust when paired with STOPFLEX pads, and better resistance to heat buildup under hard use. On a car as heavy as the i7, that adds up to cleaner wheels, brakes that are ready after long stretches of light use, and a more controlled feel during hard stops.
How long do STOPFLEX carbon ceramic rotors last on the street?
For street driving with no track use, STOPFLEX puts rotor life at roughly 250,000 to 300,000 km. On an EV that leans on regen for most stops, the friction brakes see even less wear, so durability is one of the strongest reasons to do this on an i7.
