If tyres of different speed ratings are mounted on a vehicle, the lower speed-rated tyres should be placed on the front axle. This is to prevent a potential oversteering or understeering condition in both wet and dry roads. Vehicle handling may be affected, and the vehicle’s speed capacity is now limited to the lowest speed-rated tyre. Ensure that the speed index of the tyre is at par or more than the vehicle maker recommendation. Also ensure to never mix tyres of different speed index on the same axle.
For best all-around performance, the same type tyre should be used on all four-wheel positions. tyres of different size designations, constructions, and stages of wear may affect vehicle handling and stability. NOTE: Some vehicles are intentionally fitted with different size tyres on front and rear.
For four-wheel drive vehicles, if no instructions for tyre mixing appear in the vehicle owner’s manual, adhere to the following guidelines:
When replacing speed-rated tyres, you must use replacement tyres with ratings equal to or greater than those of the original equipment tyres, if the speed capability of the vehicle is to be maintained. The handling of a performance vehicle may be different when the replacement tyres are not the same speed rating. Refer to the vehicle owner’s manual to identify any tyre speed rating restriction that could affect operation of the vehicle.
Never choose a tyre that is smaller in size or has less load-carrying capacity than the tyre that came with the vehicle. tyres should always be replaced with the same size designation — or approved options — as recommended by the vehicle or tyre manufacturer. The correct tyre size can be found on the door placard of the vehicle or by consulting your local authorized Michelin retailer. Your current tyres’ size can be found by reading the markings on the sidewall.
For upsizing, one needs to keep in mind the below conditions:
The above recommendation is Michelin recommendation only, contact your vehicle maker for their recommendation.
Michelin recommends replacing all four tyres at the same time, however if replacing only two new tyres, be sure that the new tyres are the same size & tyre type as the current tyres and that the dealer always installs the new tyres on the rear axle of the vehicle. Click here for more information.