Donnymac

I have a spare set of 20” wheels that I would like to try a summer NRFT.

Suggestions comments - sidewall height concerns, etc?

Thanks.

Quenthel

Following! I'll need to change mine too, soon (Non-AMG, so 245/275),

​​​​I'd be interested in less road noise and higher safety first, fuel economy and tyre longevity second.

Donnymac

I’ll start doing a little home work this week. Wheel well tolerance is my big question.

Donnymac

Take a look at this www. Let’s you tinker with size options.

https://tiresize.com/height-calculator/

I’m still looking.

Quenthel

Thanks for the link! Biggest problem I have is the lack of availability of the same model of tyre for the 245/40/20 & 275/35/20. The Goodyear Assymetric 6 seemed very promising, but it's not available. Same for the Michelin Pilot 5. Here's what I've discovered so far:

First, I'm looking at high-end'ish brands. I am willing to spend a lot of money on tyres in order to ensure road safety, so, no cheap chinese options for me. I'm also looking for summer tyres, rather than all-weather.
I am between Bridgestone Potenza Sport (I have the Bridgestone Blizzak for my winter wheels, they are OK), the Michelin Pilot Sport 4s, and some Pirelli P Zero variation.

The Load Index requirement is 99 for the fronts, 102 for the rears. All of the above pass.
Speed Index requirement is W (up to 270km/h). All of them pass, being either W or Y (300km/h).

For the next two, I'm relying on a Swiss tyre selling site that posts their EU efficiency labels, so I am not sure how accurate those metrics are. I couldn't easily find reviews however. The P Zeros have many variations, some more expensive than the others, but I'm going with the Mercedes ones.

Fuel consumption: The P zeros are the most economical apparently (C & A rating), the other two are matched (C & D).
Noise: It's a bit of a toss. P zeros, are the quietest (69 & 72db), then come the Pilots (71 & 71) and the Bridgestones are the loudest (72 & 73).


In terms of price, the P Zeros win. For the Swiss market anyway, the P Zeros cost 265x2 & 300x2, the Bridgestones cost 305x2 & 315x2 and the Michelins 365x2 and 435x2 (!).


I think that the P Zeros, at least the Mercedes variation, seem to be the better option.

cfmistry

I’m an All-Season guy but I can tell you that if comfort is a priority I can see that on this specific sub-forum Pirelli has a good reputation.

Donnymac

Thanks so much for your quick and wide range of research. I share your concerns and requirements. Totally agree on quality and W or Z. Currently, I have P Zeroes on my 550 and Potenza Ys on a few other cars. All are RFT.

Once I move past concerns of tire character, I wonder how NRFT fronts would fit in full l/r turns with taller sidewalls. I’ll check my current clearance tomorrow.

Thanks for your good help.

carlosinseattle

I bought a CPO car in November and didn't take a close look at the tires on the car...since it was CPO. Just got a puncture on a tire which resulted in a slow leak. After looking at the tires more closely, all 4 are Goodyear tires, I just realized the 2 fronts ore designated as MOE tires and the 2 rear tires are run flats. Never heard of MOE before today.

https://www.tirerack.com/upgrade-gar...d-or-moe-tires

Quadrobenz

For summer NRF tires consider installing the tires MB uses on the AMG versions of the W222. 255-40 front, 285-35 rear. I find the Michelin PS4s to be the best choice for performance, silence and ride. The speed rating is (Y), when the Y is in brackets it means the tire has an application specific rating in excess of 186mph. If using MB 20" wheels you know they will fit.Tires in these sizes for MB's are available from a number of manufacturers.

1bad540

Im in Nyc and have a set of 20" 245fr and 275 rr Goodyeras that were taken off my cpo car. Anyone interested and close pm me.

as.thompson

MOE is run flat by another name. It stands for Mercedes Original Extended. Strange nomenclature for sure.

jcat

for summer tires, my choice would be the pilot sport 4S. My S550 will be wearing all seasons year-round on the 19" sport package wheels, but if I end up putting some aftermarket wheels on it, PS4S will be the tire of choice.

Stay away from Cup 2's, they wear way too quickly. Personally, I can't stand pirellis. Haven't liked them on any vehicle I've had them on. Ironically, I have 3 vehicles at home right now with pirellis on them (s550, Jag F type R, Volvo XC90) and can't wait to replace all of them.

Continental makes a decent tire, as do Hankook and Falken.

Donnymac

My concern is “wheel well tire clearance” by swapping from RFT to NRFT with taller sidewall ie clearance. I’m OEM 19” front and 20” rear. Thoughts on clearance?

Agree on pirellis which are now on the S550 waiting on NRFT.

jcat

I think if you stick with the same OEM sizing there shouldn't be a significant difference in overall height from runflat to non-runflat.

20s were an option on the S class, but many people run 21s or 22s on W222's without any issue whatsoever. Typically, each diameter you step up would require a step down of 5 on the aspect ratio. I.e. if you're running 45 aspect ratio on the 19s, you'd run a 40 in the same width on a 20.

If you're RWD, tire height doesn't matter much except for in the rear for speedometer calibration concerns. you can use a calculator like the one at https://tiresize.com/calculator/ to check the difference in size. In my example above, going from a 245/45/19 to a 245/40/20 is the exact same overall diameter.

The bigger question is width. If you go from say a 19x8.5 to a 20x8.5 or even 20x9, as long as the offset isn't too crazy you shouldn't rub at all. going up much more than an inch in width or adjusting offset by more than 10mm would enter the realm of concern, IMO.