Whether to replace one, two or all four tyres at once depends on the remaining tread depth of your existing tyres and your vehicle type. If the three remaining tyres still have substantial tread — more than 3mm — replacing just the damaged tyre is generally acceptable for front-wheel-drive vehicles. The new tyre should be fitted to the rear axle, with the better-condition existing tyre moved to the front.
For all-wheel-drive and four-wheel-drive vehicles, tyre manufacturers and vehicle makers often recommend replacing all four tyres simultaneously. Significant differences in tyre diameter between axles — which can result from one new tyre being paired with three worn ones — can cause the drivetrain to work against itself, potentially damaging expensive components such as the centre differential or transfer case.
If your existing tyres have less than 3mm of tread remaining, it is often more economical to replace all four at once. This ensures even wear going forward and gives you the best handling balance and safety. Royal Mobile Tyres Cardiff can inspect your current tyres and give you a straightforward recommendation on whether a single replacement or a full set makes more sense for your vehicle and budget.