This size is frequently fitted to 20-inch alloy wheel packages on SUVs and crossovers, including models such as the Peugeot 3008 GT and Peugeot 5008 GT. Fitments can vary by trim level, model year and optional wheel upgrades, so confirm 235/45 R20 on the tyre sidewall or the door-jamb placard before ordering.
Match the load index and speed rating shown on the vehicle placard or handbook, then choose a tyre that meets or exceeds those figures. Many 235/45 R20 options are offered in higher load versions (often marked XL) to suit heavier SUV weights and passenger loads, but the correct specification is the one stated by the manufacturer for your exact trim.
For mainly mild UK conditions, all-season tyres in 235/45 R20 are a popular choice because they are designed to cope with cold, wet roads while still working well in warmer months. If you want maximum warm-weather grip and precision, summer tyres are best, while winter tyres are the right option for regular cold-weather use, especially where temperatures often drop below 7C. For winter use, look for the 3PMSF symbol and fit the same type across the axle.
You can replace a single 235/45 R20 tyre if the others have very similar tread depth and the same tyre type, but changing a pair on the same axle is usually the safer choice for consistent grip and braking. If the remaining tyre on that axle is noticeably more worn, fitting two matching tyres helps keep the vehicle stable in wet conditions and reduces uneven wear.
Check the current tyre markings and the vehicle placard: XL indicates a reinforced load capability that is common on SUV fitments, while run-flat tyres should only be used if the car is set up for them and you intend to keep that system. If you drive an electrified model, EV-focused versions of 235/45 R20 can prioritise lower rolling resistance and noise control, but they still need to match the required load index and speed rating for your vehicle.
