Michelin 235/45 R21 101Y Pilot Sport 4 SUV Acoustic MO-S 2024

Michelin Pilot Sport 4 SUV Acoustic MO-S 235/45 R21 101Y is a premium summer performance tyre designed for compatible SUVs and crossovers requiring a 21-inch fitment. This exact configuration features a 235 mm section width, 45-series profile and 21-inch rim, with a 101Y XL service description. Load index 101 corresponds to a maximum load of 825 kg per tyre, while the Y speed rating allows speeds up to 300 km/h under the specified operating conditions. The MO-S marking identifies Mercedes-Benz homologation, while Acoustic technology is designed to reduce tyre-generated cabin noise. :contentReference[oaicite:0]{index=0}

Tread Design and Steering Response

The Pilot Sport 4 SUV uses a performance-oriented asymmetric tread design developed for SUV applications. Its tread architecture is intended to provide precise steering response, stable road contact and predictable handling during straight-line driving, lane changes and cornering.

Dry-Road Handling and Cornering

The 235 mm footprint combined with the low 45-series profile provides a broad contact area and responsive steering characteristics. The reinforced XL construction supports the higher load requirements of compatible performance SUVs, while the performance-focused tread is designed to maintain stable contact during cornering and acceleration.

Wet-Road Performance

The tread pattern uses longitudinal grooves and water-management channels to help evacuate water from the contact patch. The exact 235/45 R21 101Y XL Acoustic MO-S configuration carries an EU wet-grip class A rating, supporting strong wet-road braking and traction. :contentReference[oaicite:1]{index=1}

High-Speed Stability and Braking

The Y speed rating provides a rated capability of up to 300 km/h. The low-profile construction, reinforced casing and performance-oriented tread are designed to provide stable high-speed road behaviour and controlled braking. Actual performance depends on vehicle condition, tyre pressure, road surface, temperature and load.

Acoustic Comfort

Michelin Acoustic technology uses an internal noise-reduction solution designed to reduce tyre-generated resonance inside the vehicle cabin. The exact configuration is listed with an external rolling-noise value of 72 dB and noise class B. :contentReference[oaicite:2]{index=2}

Seasonal Performance

The Pilot Sport 4 SUV 235/45 R21 101Y XL MO-S Acoustic is classified as a summer tyre. It is designed for performance-oriented paved-road driving in warm and moderate conditions rather than severe winter use. The exact configuration is not rated for severe snow conditions and does not carry a 3PMSF marking. :contentReference[oaicite:3]{index=3}

Mercedes-Benz Homologation

The MO-S marking identifies the Mercedes-Benz homologated specification. This exact 235/45 R21 101Y XL Acoustic configuration is listed by Michelin as MO-S, making the homologation particularly relevant for compatible Mercedes-Benz SUV applications requiring this specification. :contentReference[oaicite:4]{index=4}

Load Capacity and Speed Rating

The 101 load index corresponds to a maximum load of 825 kg per tyre. The Y speed rating corresponds to a maximum rated speed of 300 km/h, subject to the applicable load, inflation pressure and vehicle manufacturer's requirements. :contentReference[oaicite:5]{index=5}

Who Should Consider This Tyre?

Michelin Pilot Sport 4 SUV Acoustic MO-S 235/45 R21 101Y is suitable for compatible SUVs and crossovers requiring this exact Mercedes-Benz-homologated fitment. It is particularly suited to drivers seeking precise steering, strong dry-road grip, excellent wet-road braking, high-speed stability and reduced cabin tyre noise.