mercedes.fan

Hi

With AMG line the fron wheels are 245/40/19 and the rears are 275/35/19. For winter tyres I have looked at tyres with the dimensions 245/45/19 and 275/40/19, sidewall factor increase of 5, instead because the price difference is dramatic and I would prefer a tyre that fills the well more. Will it rub? Does anyone have first hand experience with slightly bigger wheels?

JDPEClassUK

mercedes.fan

By my calculations it will be off around 4% from factory and the overall height of each wheel will increase about one inch (2.45 cm front and 2.75 cm rear). I have seen lowered w213 but I assume they use coilovers or air suspension, which I wont have.

Frank Rizzo

I swapped out the rear tires on my old 2009 CLK550. I went from 255/50/18 one size up to a 265/50/18. After I did, the traction control light would blink when I went around corners - it was especially bothersome when driving thru the canyons. The small difference in diameter was enough for the car to think it was loosing traction when cornering. I'd stick with the same diameter tire.....

mercedes.fan

oh is the tractions system in the w213 as sensitive? Does anyone have first hand experience. Saw a post in a another forum about someone that had slightly larger winter tyres on his w213 without any issues, but i think he had ABC if that makes a difference.

ua549

The tire diameter, rolling radius or revs per mile must be as closely matched to the original specs as possible. The actual wheel size isn't a concern as much as offsets and clearances. IMO the best sources of data to use for comparisons is TireRack.com and Wheel-Size.com.

threeMBs

There is a big (actually huge) typo here. (Probably meant 255/35-18.)

OP, you can easy run taller tires, maybe not as tall as you want, but you'll have zero issues with 255/40-19 with 285/35-19 (but not on stock wheel - too narrow) or maybe even 235/45-19 with 265/40-19.

mercedes.fan

threeMBs

235/45-19 & 265/40-19 was a hypothetical rather than practical exercise since do not think anyone actually makes them as a set.

More importantly for winter (I missed "winter") you want a square set up (over staggered) and definitely going down to 18", and for 18" the tallest would be 235/50-18 (with plenty of snow tire choices) - both satisfies your requirements: (much) taller sidewall and narrower tires which is very beneficial for snow/ice.

mercedes.fan

I understand that but the winter tyres options that were reasonably priced at the dealership, 18 inch, were really ugly. So I was thinking about having the tyres changed on the rims for winters as that would be a cheaper option and better looking option. Good winter tyres for that dimension are available at a decent price. But the factory rims are staggered and if that is a hazard maybe its better to just buy a squared set of 18s with factory specifications? Thank you very much for the help so far!

suby01

Way too cold for speedos here.

Frank Rizzo

Point taken (not sure it is huge though), I sold the car 4 years ago and was doing it from memory.

The concept was that the aspect ratio stayed numerically the same and I merely increased the width one size (10 mm) and that bump and the resulting new aspect ratio was enough to cause the traction control system to be unhappy - was the important take away, as this was real world experience. Hence the point to keep the same diameter.
.

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mercedes.fan

So will a small increase in overall tire height make the car freak out?

threeMBs

Absolutely not, as long as both front and rear are in sync. (Speedo error is only relevant if one is on a legal speeding border line and 2 m/h is a decider in getting a speeding ticket or not.) Regarding concerns wether a car will have any issues with front & rear diameters increased of up to 1" inch, then the answer is no (as long as tires fit without rubbing).

For winter it is alway advantageous to go -1 and narrower than stock with higher sidewall, hence 235/50-18 (since you're on 19s, even stock size of 245/45-18 will satisfy your requirements) on 18x8 (or 18x8.5) square set up. If you are in the US, TireRack has some fantastic pricing.

mercedes.fan

Thank you very much for the input!

5Hundred

Im thinking to go 245 45 19 and 275 45 19 in the rear. Stock tire sizes 245 45 18. Any possible issues?

I don't think I will have rubbing issues as the car is not lowered

JakeW213

to my knowledge: the profile 45 in the 245/45 means its 45% of the 245 which is 24.5 centimeters so the height is 45% of 24.5 cm = 11.025 cm

if you then take a 275(27.5 cm) wide tire and make the profile the same(45) then you end up with a side wall height = 45% of 27.5 cm = 12.375 cm

so your tirewall will be over 10% bigger

so besides it looking “hot-rod” it will only help ride smoothness on the rear. And if you have 4matic - this is a big no no as wheel diameter should be identical on all four wheels.

the correct way to go about this is to lower the profile if you want a wider tire... that way you can keep the tirewall height close to identical.

my tires are:
front : 245/35-20
rear: 275/30-20

if your stock is 245/45-18

your best bet on 19” would be
front 245/40-19
rear 275/35-19

and make sure you have a wider rim with an offset to match

rgds Jake