This size is often fitted to larger saloons and estates where extra width improves stability, including certain versions of the BMW 5 Series, Audi A6 and Mercedes E Class. Exact fitment varies by model year, trim and wheel option, so confirm the size on your current sidewall or in the vehicle handbook before ordering.
Match the load index and speed rating to what is listed on the tyre placard or in your handbook, as these vehicles can require higher ratings for weight and motorway use. If your current tyres show an XL or reinforced marking, keep the same specification unless your manufacturer states otherwise. For best results, fit the same rating across each axle.
Sometimes, but it is not a like for like swap. The tyre becomes wider and the overall diameter can change, which may affect speedometer accuracy, clearance to suspension components and handling balance. Only switch if your vehicle manufacturer lists 245/45 R17 as an approved alternative size for your wheel and trim.
Yes, some brands produce run flat tyres in 245/45 R17, but they are only suitable if your vehicle is designed for them or you have the correct support system, such as TPMS and appropriate suspension setup. If your car currently runs on conventional tyres, switching to run flats can change ride comfort and noise, so check manufacturer guidance first.
Summer tyres in 245/45 R17 suit warmer months and prioritise dry and wet grip at typical UK temperatures. Winter tyres are a safer choice if you regularly drive in cold conditions or see snow and ice, especially early mornings and rural routes. All season tyres offer a practical year round compromise for mixed weather, and they are popular for higher mileage drivers who want consistent performance without seasonal changeovers.
