Michelin-Developed Marked Tires

An OE (Original Equipment) marking on the tire sidewall indicates that tire was developed and approved specifically for a particular vehicle manufacturer. For example, MO indicates approval by Mercedes-Benz, AO by Audi, and N0 by Porsche. These tires went through a joint development and validation process between Michelin and the automaker, tuned to the specific weight, suspension, and performance characteristics of that vehicle. The marking is part of the standardized sidewall coding system.

Because the tire is tuned to work with that vehicle's specific engineering. Every vehicle has a unique combination of weight distribution, suspension geometry, power output, and braking system. A tire developed in close collaboration with the automaker can be optimized for noise at the frequencies that car's chassis amplifies, for rolling resistance targets set by the drivetrain, or for the load distribution of a particular battery pack. A standard tire in the same size meets regulatory requirements; a marked OE tire goes further to match the manufacturer's internal performance targets.

It's what Michelin recommends wherever possible. Replacing an OE-marked tire with one carrying the same marking helps preserve the vehicle's intended performance characteristics in handling, noise, comfort, and efficiency. The OE marking is not a legal requirement — a tire of the correct size, load rating, and speed rating will fit and meet regulatory standards — but it does represent additional development work specific to that vehicle. Where an exact match is unavailable, consult with an authorized Michelin dealer.

Look at the sidewall of your current tires. OE markings appear as letters, symbols, or short codes molded into the rubber near the size marking — typically MO, AO, T0, T1, N0, N1, ND0, or similar. If you're unsure what a marking means, a Michelin dealer or the vehicle manufacturer's documentation can identify it. The vehicle owner's manual may also note whether OE-specific tires were fitted at the factory.

They're available for purchase as replacement tires through authorized Michelin dealers and specialist tire retailers. The same tire fitted at the factory can be bought and installed when replacing worn tires, which is why the OE marking on the sidewall is worth checking before purchasing replacements — it maintains continuity with what the vehicle was originally designed around.

Yes — fitting a tire with a higher speed rating than the OE specification is permitted. A higher speed rating indicates a more robustly built tire at that performance level. However, choosing a higher-rated tire can sometimes affect ride comfort or tread life, since the compound may be optimized for different priorities. Fitting a tire with a lower speed rating than the OE specification is not recommended, as it may limit the vehicle's safe operating capability.