vkaushal

Someone told me that in Nav. settings you have to put in the exact profile / size of your tires (e.g. 235/40/R18) and then it will be accurate. My friend installed 19" wheels on his car and was off till he fixed the setting.

kort677

I never heard of such nonsense, exactly where is this info collected?

scorchie

It's collected on his 2004 C-class.

You should always be wary of people posting things who don't own a car similar to yours, or preface statements with "someone told me" or "i heard" or especially... "i read on the internet that..."

-s-

pfphipps

Tire size is used as an input on many in-car GPS systems. Different tire diameters will give a different speeds for the same revolutions. I think it was a VW or Audi system that had a method of entering it from an on-screen display. The car's GPS software uses the car's speed, along with other inputs such as an interital sensor, to calculate the car's position in case of a loss of the satellite signals. The speed it can also be used for calculating the time to arrive at the destination (although speed can also be determined from received GPS signals if they are present).

The tire's profile is only important in that different profile tires have differrent diameters. In any case, the tire size is probably a minor input to the system but is used to try to make it a little bit more accurate.

kort677

That could be but in my MB, there is no place to input such info, this is the w211 board?