235 is the tyre width in millimetres, 35 is the aspect ratio (sidewall height as a percentage of the width), and R20 means it fits a 20-inch rim. This combination creates a relatively wide contact patch with a shorter sidewall, so it is important to match the correct load index and speed rating specified for your vehicle.
Check the tyre placard (usually in the driver door shut or fuel flap) and your handbook for the exact size, plus the load index and speed rating. Some cars use staggered fitments, so confirm whether 235/35 R20 is required on the front, rear, or all four wheels before ordering.
Use the manufacturer specification first, because the same size can be offered with different ratings. Many 235/35 R20 tyres are available with higher speed ratings suited to performance cars, but you should not drop below the rating listed on your vehicle placard. If you are unsure, filter results by your required load and speed rating and select a matching option before checkout.
Many vehicles running 20-inch wheels specify XL because the shorter sidewall can benefit from the higher load capacity and added support. If your current tyres are marked XL, or your placard states XL/reinforced, choose an XL option in the same size. If XL is not specified for your vehicle, stick to the exact rating recommended by the manufacturer.
For warmer months and performance-focused handling, summer tyres are the common choice in this size. If you drive year-round and want one set to cover wet and colder conditions, all-season tyres can be a practical compromise, especially in typical UK weather. Winter tyres are best for regular sub-7C temperatures or snow, but availability in 20-inch performance sizes can be more limited, so check options early and fit a full set for balanced grip.
