They are the same size, but ZR indicates the tyre is designed for higher-speed capability. Always choose based on the full marking, especially the speed rating letter (for example W or Y) and the load index required by your vehicle.
Use the specifications on your door jamb placard or in the owner’s handbook, then match them when selecting tyres. Do not fit a lower load index or speed rating than the manufacturer requires, and you can move to a higher rating if you want the added margin.
Only if the overall rolling circumference stays within an acceptable tolerance and there is enough clearance on lock and under compression. A change in profile or width can affect speedometer accuracy, handling balance and rubbing, so check with your fitter and your insurer before switching.
Yes, the very short sidewall offers less protection for the wheel and is less forgiving over sharp edges. Keeping pressures correct, avoiding kerb impacts, and considering XL (reinforced) versions where available can help reduce the risk of sidewall bubbles and rim damage.
They can, but the choice is usually more limited than in higher-profile sizes because this fitment is often used for performance-focused setups. If you drive year-round in the UK, consider an all-season option where available, or a winter tyre if you regularly face cold temperatures and poor traction.
