235 is the tyre width in millimetres, 50 is the profile (sidewall height as a percentage of the width), R means radial construction, and 18 is the wheel diameter in inches. For correct fitment and safe handling, the size should match 235/50 R18 exactly unless your vehicle manufacturer lists an approved alternative.
235/50 R18 is regularly found on mid-size SUVs and crossovers, including certain trims of the Volkswagen Tiguan, Ford Kuga, Volvo XC40 and Audi Q3. Always confirm the exact size and tyre specification on your door jamb sticker, handbook, or current tyre sidewall before ordering.
Use the load index and speed rating shown on your current tyres or vehicle placard, and match it exactly or choose a higher rating where permitted. In 235/50 R18, it is common to see higher-load options such as XL, which can be important on heavier SUV applications and fully laden driving.
Summer tyres in 235/50 R18 suit warmer conditions and offer strong dry and wet road performance. Winter tyres are best if you regularly face low temperatures, snow or ice, while all-season tyres provide a practical year-round compromise for mixed UK weather. Choose based on where you drive most and how often temperatures drop below 7C.
Some 235/50 R18 tyres are available as runflat, but you should only use them if your vehicle is compatible and you are happy with the ride characteristics. If switching to standard tyres, plan for puncture mobility (sealant kit or spare, if your vehicle supports it) and replace tyres in pairs on the same axle to keep handling consistent.
