2012 Mercedes-Benz SLS AMG Roadster Long-Term Road Test


2012 Mercedes-Benz SLS AMG Roadster: Go Fast Tire Pressure

January 28, 2013

2012 Mercedes-Benz SLS AMG Roadster

Last week we explored the myriad tire pressure settings of our 2013 Porsche 911 Cabriolet.

Curious as to whether or not our high-powered Mercedes had a similar tire-pressure issue, I dove into the owner's manual to find out.

The answer? Yes. And no.

As per the door jamb sticker, the recommended tire pressures on our Continental ContiProContacts (Front: 265/35ZR19 Rear: 295/30ZR20) is 31/35. There's no ancillary sticker, only a small, blacked-out alert that says "See owner's manual for additional information."

Ok.

The owner's manual doesn't say much, but it does point out that the recommended tire pressure is only good for speeds of up to 155 mph and that if you plan to go faster, check the tire pressures as posted on a sticker on the inside of the fuel door.

Ok.

Once inside the fuel door (metal, sweet) you'll see a new sticker that indicates the normal tire pressure (which we're currently running) as well as the tire pressure to sustain speeds of over 155 mph. This pressure is 35/42. Similar to our Porsche's high-speed default setting. (The sticker also indicates that when warm, the tires will be up to 4 psi over the stated amount and that on winter tires you should run 35/42 psi.)

So, like the Porsche, we've got two separate tire pressures for different driving modes. The difference is that Porsche defaults to the big numbers while Mercedes realizes this driving style is a rarity and defaults to comfort.

2012 Mercedes-Benz SLS AMG Roadster

Mike Magrath, Features Editor @ 15,480 miles

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