255/40R21 102Y Dunlop SportmaxxRT2 MO XL (GE)
Original price was: $409.50.$288.00Current price is: $288.00.
The Dunlop Sport Maxx RT 2 in size 255/40R21 102Y XL is a flagship Ultra-High Performance (UHP) summer tyre that serves as the 2026 benchmark for steering precision. The MO marking signifies that this is a Mercedes-Benz Original fitment, specifically co-developed for the Mercedes-Benz GLC 43 AMG and high-performance GLC variants.
The (GE) designation confirms manufacturing in Germany, ensuring the highest tier of European quality control.
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Description
Dunlop Sport Maxx RT 2 (255/40R21 102Y MO XL GE)
The Mercedes AMG Standard. Racing Technology for the Executive SUV.
The “RT” stands for Racing Technology, and this second-generation model is designed to provide “the best of both worlds”—the aggressive dry grip of a track tyre with the wet-weather safety required for daily road use.
| Specification | Detail |
| Size | 255/40R21 |
| Load Index | 102 (XL – Extra Load: Max Load 850 kg per tyre) |
| Speed Rating | Y (Max Speed: 300 km/h / 186 mph) |
| Homologation | MO (Mercedes-Benz Approved) |
| Origin | GE (Germany) |
| UTQG Rating | 240 AA A (Focus on Max Traction) |
✨ Key 2026 Performance Technologies
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🏎️ Power Braking Blocks:
The tread features high-stiffness blocks designed to resist deformation under extreme pressure. This ensures that during high-speed emergency stops, the tyre maintains a massive contact patch, delivering significantly shorter braking distances.
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📐 Dual Silica Racing Compound:
Derived from Dunlop’s motorsport heritage, the compound is infused with traction resins that improve the rubber’s “interlocking” capability with the road. This provides exceptional dry grip and a sharp “turn-in” feel.
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🔇 Noise Shield Technology:
To complement the luxury of a Mercedes-Benz cabin, this GE-made variant features an optimized pitch sequence. At 72dB, it effectively disperses road noise, ensuring a quiet and refined driving experience despite its aggressive performance profile.
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🌧️ Wide Circumferential Hydro-Grooves:
The asymmetric pattern includes deep longitudinal channels that act as high-velocity water pumps. This provides exceptional resistance to hydroplaning, a critical safety margin during heavy tropical afternoon cloudbursts.
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🏗️ Multi-Radius Tread (MRT):
This technology ensures a more uniform pressure distribution across the tyre’s footprint. This leads to more even tread wear and a more predictable handling sensation throughout the tyre’s entire lifespan.
📊 Performance Summary
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Steering Precision: ⭐⭐⭐⭐⭐ (Razor-sharp AMG-spec feel)
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Wet Safety: ⭐⭐⭐⭐⭐ (Benchmark Class-A braking)
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Dry Handling: ⭐⭐⭐⭐⭐ (Exceptional lateral grip)
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Ride Quality: ⭐⭐⭐⭐ (Firm and communicative)
The Dunlop Sport Maxx RT 2 MO is the essential choice for 2026 for Mercedes GLC 43 owners. It is the only tyre that preserves the car’s original steering geometry, braking certifications, and high-speed stability ratings.
Additional information
| Width | 255 |
|---|---|
| Height | 40 |
| Rim size | 21 |
| Model | SPMaxxRT2 |
| Run Flat | No |
| Load / Speed Index | 102Y |
| Brands | Dunlop |
| Year | 2021 |
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