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Hi guys,

Can I put 235/40/R18 winter tires in all 4 corners? Is 18" bad in winter due to size?

Stock is 225/45/R17 Front & 245/40/R17 Rear.

Thanks
 

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2009 C300 Sport 6 Speed; 2008 E350 4MATIC Sport
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Hi guys,

Can I put 235/40/R18 winter tires in all 4 corners? Is 18" bad in winter due to size?

Stock is 225/45/R17 Front & 245/40/R17 Rear.

Thanks
You are going the wrong way with winter tires. The better size is 215/50-17" (on 17x7.5" or 7" wheels...either will work), preferably Bridgestone Blizzak WS70. The winter needs the narrowest tire possible, to concentrate the weight of the vehicle in a small tire contact patch, allowing it to cut through the snow rather than distribute the weight over a larger contact patch and ride on top of the snow. I realize this is a new size for you, and I also have the same OE size staggered setup, but if you check this out on 1010tires.com with their calculator, you will see the compatibility.
 

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I have a 2012 C300 4matic Sport with 18" wheels. Has anyone put 17" wheels and tires for the winter? I assume it is going to cause issues with the speedometer and odometer. Is there an adjustment that can be made?
 

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2009 C300 Sport 6 Speed; 2008 E350 4MATIC Sport
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I have a 2012 C300 4matic Sport with 18" wheels. Has anyone put 17" wheels and tires for the winter? I assume it is going to cause issues with the speedometer and odometer. Is there an adjustment that can be made?
Your assumption is not correct. The wheel and tire together make an assembly of a certain circumference. The speedometer doesn't care how much of that assembly is diameter of the wheel versus the sidewall of the tire...only the overall total measurement matters. Enter your 18" tire size on the calculator on 1010tires.com and then compare it to the size I recommended. Try some other sizes as well. Note the differential in circumference and the resultant speedometer changes. Minor changes which don't alter results by more than a mile per hour or so are fairly inconsequential. The 1010.com site recommends no more than a 4% difference, as I recall, but you can find a better match than that.
 

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I have a set of Blizzak WS50's from an E350 that are all 245/45R17 and want to put them on my C300 4M. I know that thinner is better than wider but, I also believe that any is better than none (to a certain extent). Anyone see a major problem here? I tried the 1010tire site but, had no idea how/where to get the "offset" figures.
 

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2008 C300 Barolo Red P2 MM leather 18" AMGs new style folding mirrors + 1984 944
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I have a set of Blizzak WS50's from an E350 that are all 245/45R17 and want to put them on my C300 4M. I know that thinner is better than wider but, I also believe that any is better than none (to a certain extent). Anyone see a major problem here? I tried the 1010tire site but, had no idea how/where to get the "offset" figures.
45 series tires are going to be a bit too tall and will affect the speedo reading a small amount and accelleration will be a bit slower. But if the tires are free, this might be better than dropping $800 or so for tires in the correct size.

Offset relates to wheel dimensions, not tires.
 
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