The Xiaomi SU7 Ultra is a technical tour de force, boasting a tri-motor setup and a factory braking system that already features carbon-ceramic discs. However, for the serious track enthusiast, the factory "short-fiber" (chopped) ceramic rotors can present limitations in longevity and oxidation resistance under extreme sustained load. To truly unlock the endurance required for Nürburgring-style laps, this owner chose to upgrade to the pinnacle of materials science: a StopFlex Continuous Long-Fiber Carbon-Ceramic Rotor System.
The Struggle
While the SU7 Ultra comes track-ready, frequent circuit use exposes the inherent characteristics of the standard chopped-fiber discs:
- Structural Oxidation: Under the extreme temperatures (>800°C) of sustained tracking, standard short-fiber rotors can experience accelerated oxidation, leading to surface roughness and mass loss.
- Disposability: Once a chopped-fiber rotor wears beyond its limit or suffers surface delamination, it typically cannot be refurbished, requiring a costly replacement.
- Thermal Capacity: While iron conducts heat faster, carbon-ceramic relies on immense heat capacity. The factory discs are excellent, but continuous long-fiber structures offer a denser matrix for even greater thermal stability.
Technical Specification
This is a Direct-Fit Rotor Upgrade designed to replace the factory short-fiber discs while retaining the SU7 Ultra's massive factory Akebono 6-piston calipers. It utilizes advanced 3D continuous fiber technology for superior durability.
| Vehicle | Xiaomi SU7 Ultra |
|---|---|
| Front Hardware | Factory Akebono 6-Piston + 430mm Long-Fiber CCB |
| Rear Hardware | Factory Floating Caliper + 410mm Long-Fiber CCB |
| Technology | 3D Continuous Long-Fiber Matrix |
| Pad Material | StopFlex Endurance Pads (Long-Fiber Compatible) |
Compatibility Redline
This rotor-only swap is strictly engineered for the Xiaomi SU7 Ultra equipped with the factory Fixed Akebono Calipers. It is designed to replace the factory carbon-ceramic rotors. It can be directly installed on SU7 Max models equipped with factory Brembo/Iron systems.
Engineering Validation
1. Superior Structural Integrity
Factory short-fiber rotors are made from chopped carbon fibers. Under extreme thermal stress, they can be prone to oxidation and surface pitting. Our Continuous Long-Fiber construction creates a 3D matrix that is significantly stronger and more resistant to heat degradation, potentially extending rotor life under track conditions by up to 3x.
2. Unwavering Thermal Capacity
While iron rotors dissipate heat quickly due to high conductivity, they fail (soften/glow) at high temperatures. Carbon ceramic's advantage is its ability to absorb immense energy without structural failure. StopFlex long-fiber rotors raise this ceiling even further, operating stable at temperatures exceeding 1,300°C where even standard ceramics might degrade.
3. Refinishability & Longevity
Unlike many disposable factory carbon discs, StopFlex long-fiber rotors are denser and can often be resurfaced up to 3-4 times. This offers a much longer service life for the dedicated track user, effectively lowering the long-term running costs of a hyper-EV.
4. Optimized Pad Interface
Our system includes pads specifically formulated for the long-fiber surface. This pairing ensures an optimal transfer layer is maintained even during street driving, preventing the "cold bite" issues sometimes associated with race-spec ceramic systems.
Installation Gallery
In-Depth SU7 Ultra FAQ
Q: The SU7 Ultra already has carbon-ceramic brakes. Why switch to STOPFLEX?
The factory rotors utilize "chopped" or short-fiber technology. While excellent for street and light track use, they can oxidize and degrade faster under the immense heat of a 2.3-ton EV on a circuit. StopFlex rotors use Continuous Long-Fiber technology, which offers superior structural integrity and significantly longer track life.
Q: Will this upgrade improve my stopping distance?
For a single stop, tires are the limit. However, this upgrade massively improves repeatability. The higher thermal capacity and structural density of the long-fiber rotors prevent the material fatigue that can occur with factory rotors during a 20-minute track session, ensuring your braking points remain consistent lap after lap.
Q: Is this compatible with the SU7 Ultra's track mode and regen settings?
Yes. The system is designed to replicate the factory rotor geometry perfectly. It integrates seamlessly with the SU7 Ultra's sophisticated brake-by-wire and regenerative braking systems, requiring no software calibration.
Q: Can these rotors be refurbished?
Yes. Unlike the factory short-fiber discs which are typically "wear-out and throw-away," StopFlex long-fiber rotors can be resurfaced (refurbished) multiple times, making them a more sustainable choice for heavy track users.
Q: Is there a weight difference compared to the factory CCB?
The weight is comparable to the factory CCB setup (both are extremely light compared to iron). The primary advantage here is durability, thermal capacity, and the ability to withstand higher operating temperatures without oxidation.
