joche

Hi all, i need to change the tires on my s560 coupe RWD, but my local shop have this sizes:
245/40/20 F AND 285/35/19 R could i have any problem with this setup?.

Thanks in advance.

okbarnett

you shouldn't change the sizes. You need to stay stock. Every time you got o MB they are going to tell you you have the wrong tires and may deny some warranty claim.
You should have 255/40 fronts If you go to 245 they are narrower, and lower, so you introduce several alignment and steering and even clearance issues
they stock sizes are very common, you should go find them

joche

Thank you for your response, i'll search more tires shops.

okbarnett

I would worry about what brand of tire you want, then let the store find them and get them for you

as.thompson

And get them for you in the correct sizes...

joche

thank you both!. i'll do that.

GordonGEICO

Each wheel has a range of widths (+/- 10-20mm depending on the wheel) that can safely fit, and going slightly wider is generally fine as long you select a profile that keeps the outer diameter within 2-3% of the original stock. Beyond, you could have issues with the speedometer accuracy and the traction-control system. I would try to stay as close to stock as I could just to not upset the default handling characteristics, and I would never select a tire that was thinner than the OEM spec.

If you can't find perfect matches for the stock size, the best thing to do is use https://tiresize.com/calculator/ and enter your stock size plus the tires you are looking at and see how close of a match they are for the outer diameter and if they will fit, width-wise, on your wheels.

In this particular situation, you are looking at a smaller wheel in the rear (19" versus 20" in the front), which doesn't make any sense and there is no configuration of the S560 that ever came with smaller wheels in the rear. Something is wrong there.

konigstiger

Provide VIN I'll pull wheel & tire info.

joche

Sorry it was 20 no 19,thanks for the link.

AMGBM

My S-Class Cabriolet was originally fitted, for the summer season, with AMG 245-40/20” in front and 275-35/20" in front that I find noisy, and less comfortable if compared to the four 245-45/19” which I use for the winter season.

I got rid of my 20” and replaced them with 245-45/19” in front and 255-55/19" in the rear fitted with [size=13px]Michelin Pilot Sport 4 and the difference is notable.[/size]

Last summer I crossed Europe and in Germany on the highway at plus 130 mph the car was stable and comfortable, I felt very secure !

In the European country roads, do not talk about Alpine roads, it is no match to my son Porsche: the S-class Cabriolet is splendid to stroll gently with the roof down and enjoy the sights !

Remain on standard equipment and mostly avoid runflat tires !





So stick to slimmer tires and avoid run-flat

The advice is to keep standard dimensions and forget about runflat tyres.