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Key Markings Explained

• XL (Extra Load): Signifies a reinforced structure to handle heavier vehicle weights.
• FSL (Flange Shield Logic): An integrated feature designed to protect the alloy wheel rim from light kerb damage.
• Summer Performance: These tyres are designed for optimal performance in temperatures above 7°C. They do not carry winter certification (3PMSF or M+S).

Popular Compatible Vehicles (Suggestions)

These sizes are well-suited for many standard CUVs and SUVs popular in the Irish market, especially for value-conscious drivers seeking summer performance:

• Audi Q7 / Q8: Uses the 275/45 R20 size.
• Volkswagen Touareg: Compatible with the 255/50 R20 or 275/45 R20 sizes.
• Volvo XC90: Often uses the 255/45 R20 or 255/50 R20 fitment.
• Porsche Cayenne: Can use sizes like 275/40 R20 or 295/40 R20 on older models.
• Mercedes-Benz GLE: Compatible with sizes like 275/45 R20.
• BMW X5 / X6: Uses various 20" sizes within the range, often in staggered setups.
• Jaguar F-Pace: The 255/50 R20 size is compatible with this model.
• Land Rover Range Rover Sport: Compatible with the 275/45 R20 size.

Summer tyres are most common in Ireland, offering peak fuel efficiency mileage and grip when temperatures stay above 7°C. However, they are not the official standard for winter safety. Motorists must show caution in cold conditions; below 7°C, summer rubber hardens, significantly compromising grip and wet braking performance on cold, saturated Irish roads.

All-Season tyres are the superior "fit-and-forget" solution for Ireland's wet, temperate climate. Specifically engineered to remain flexible in the cold, they provide shorter stopping distances on near-freezing, rain-soaked surfaces and carry the 3PMSF certification for frost and light snow. They offer total year-round peace of mind without the hassle of seasonal swaps.

Load Rating: Maximum Weight Capacity Explained

The load index is a numerical code representing the maximum weight in kgs that a single tyre can safely carry. To ensure safety, the combined capacity of all four tyres must exceed the vehicle’s total weight when fully loaded.

Speed Rating: Maximum Velocity Explained

Represented by a letter, the speed rating indicates the maximum kph a tyre can maintain over a prolonged period. Higher speed ratings are engineered to handle the heat and stresses generated at faster speeds more effectively.

Quick Reference Guide

• Check your requirements: You can find the specific requirements for your vehicle on the tyre information plate (usually located on the driver-side door pillar) or in the owner's manual.
• Replacement rule: It is vital never to fit a tyre with a lower load index or speed rating than those recommended by the manufacturer.
• Common Ratings: Standard ratings include T (190 kph), H (210 kph), and V (240 kph). You can view a full conversion table below..

Here is a list of common sizes for the Sonar Conqueror SX9 summer tyre range available in the Irish market.

Available 20" CUV/SUV Sizes and Markings (Smallest to Largest)

• 235, 45, 20, 100V, XL, FSL
• 245, 45, 20, 103V, XL, FSL
• 255, 45, 20, 105V, XL, FSL
• 255, 50, 20, 109V, XL, FSL
• 265, 45, 20, 108V, XL, FSL
• 275, 40, 20, 106V, XL, FSL
• 275, 45, 20, 110V, XL, FSL
• 285, 40, 20, 106V, XL, FSL
• 295, 40, 20, 106V, FSL