Bridgestone S 21 R Rear Wheel, 190/55 ZR17 TL (75W), M/C, Variant M

Bridgestone S 21 R Rear Wheel

The Bridgestone S 21 R is a high‑performance supersport road tyre designed specifically for the rear wheel of modern sport motorcycles. With its advanced construction and cutting‑edge tread design, it delivers exceptional grip, precise handling, and reliable performance across a wide range of riding conditions.

Key Specifications

• Size: 190/55 ZR17 TL (75W)
• Diameter: 17 inches
• Width: 190 mm
• Aspect Ratio: 55%
• Speed Rating: W (up to 270 km/h / 168 mph)
• Construction: Radial ZR with a reinforced sidewall for enhanced stability
• Type: Supersport Road
• Variant: M (optimized for sport touring and high‑speed riding)

Design & Technology

The S 21 R incorporates Bridgestone’s proprietary HyperSport™ technology, which focuses on maximizing traction while maintaining a lightweight profile. The tyre features:

• High‑Performance Tread Pattern: A symmetrical layout with deep, well‑spaced grooves that evacuate water efficiently, reducing hydroplaning risk.
• Advanced Rubber Compound: Engineered for high grip at both low and high speeds, ensuring consistent handling during aggressive cornering.
• Reinforced Sidewalls: Provide additional stiffness to counteract the forces experienced during rapid acceleration and braking.
• Low Rolling Resistance: Enhances fuel efficiency without compromising performance.

Performance Characteristics

The S 21 R excels in several critical areas that matter to sport‑bike enthusiasts:

• Cornering Grip: The tyre’s tread design and compound deliver superior lateral traction, allowing riders to maintain higher speeds through corners.
• Braking Efficiency: A wide contact patch ensures maximum braking force, reducing stopping distances on both dry and wet surfaces.
• Stability at High Speeds: The reinforced sidewalls and precise tread geometry keep the tyre stable even when traveling close to its speed rating.
• Wet‑Weather Performance: Deep grooves channel water away from the contact patch, minimizing aquaplaning risk during rain.

Ideal Riding Conditions

The Bridgestone S 21 R is engineered for riders who demand performance in a variety of scenarios:

• Sport Touring: Offers the balance between speed and comfort needed for long rides.
• Track Days: Provides the grip and stability required for high‑intensity sessions.
• Daily Commute on Highways: Its low rolling resistance and durability make it suitable for everyday use on paved roads.

Compatibility & Installation

This tyre is specifically designed for the rear wheel of sport motorcycles that require a 17‑inch diameter. It fits most models with an M/C (motorcycle) designation and is available in the M variant, which is tailored for high‑performance riding.

Maintenance Tips

• Regularly inspect tread depth to ensure optimal grip.
• Maintain proper tyre pressure as specified by the manufacturer; underinflation can lead to overheating, while overinflation may reduce traction.
• Avoid prolonged exposure to extreme temperatures or direct sunlight to preserve the rubber compound’s integrity.

Conclusion

The Bridgestone S 21 R Rear Wheel is a premium choice for riders who seek uncompromised performance, safety, and reliability. Its advanced construction, high‑speed capability, and versatile handling make it an excellent fit for both everyday commuting and spirited riding on the track.