[D335NUTZ]

Originally Posted by svic628

Does it? Had no clue. Guess im sticking to the 40/35.

It should. Bigger sidewalls change the rolling diameter of the wheels.

[peeezy]

Originally Posted by svic628

Ive checked there. Its takes you to a page for the PS4S not the PSSUV.
This is all tirerack has available for the SUV tire.

if u dont see it online u can always call around and most tire shops can order the suv version for u. they make that size suv tire. just not everywhere has in stock or lists every single tire size. im my experience. im in canada and had no issues

[dgk2017]

Funny...I just brought my X3 in for brake maintenance, and the dealership flipped out that I replaced the 21 OEM runflats with the 255/295 Michelin A/S.

I showed them the calcs and the fact that they're within the 1% X-Drive threshold, but their big hangup was the tire RPM changing from +3 front/rear to -2 front/rear. They're claiming that with the front tires now running faster than rear, it'll negatively impact the differential and potentially void any warranty coverage.

Does that RPM differential swap really matter? It's less of a difference now between the front and rear with the 255/295s.

[Leem40i]

Originally Posted by dgk2017

Funny...I just brought my X3 in for brake maintenance, and the dealership flipped out that I replaced the 21 OEM runflats with the 255/295 Michelin A/S.

I showed them the calcs and the fact that they're within the 1% X-Drive threshold, but their big hangup was the tire RPM changing from +3 front/rear to -2 front/rear. They're claiming that with the front tires now running faster than rear, it'll negatively impact the differential and potentially void any warranty coverage.

Does that RPM differential swap really matter? It's less of a difference now between the front and rear with the 255/295s.

They're basically talking out their ass without running the numbers. Like you said, there's less of a difference now than but the factory spec so

[dgk2017]

Originally Posted by Leem40i

They're basically talking out their ass without running the numbers. Like you said, there's less of a difference now than but the factory spec so

Yeah, exactly. Just doing the quick calcs on the OEM X3M Comp tires, F255/40 R265 40, the dia diff and the RPM diff are wider than running 255/295s on the 718 rims.

What a putz that guy is. Going to walk him through the calcs and rub his face in it this afternoon. 27 yrs of experience, he says.

[mfractal]

Just installed 255/40R21 / 295/35R21 with 15mm spacers all around.

Think it's gotten pretty good.

Might have overdone it with the pictures, i am in love

[Leem40i]

Originally Posted by dgk2017

Yeah, exactly. Just doing the quick calcs on the OEM X3M Comp tires, F255/40 R265 40, the dia diff and the RPM diff are wider than running 255/295s on the 718 rims.

What a putz that guy is. Going to walk him through the calcs and rub his face in it this afternoon. 27 yrs of experience, he says.

I wouldn't go too far rubbing his face in it though. Your best option is develop a good relationship with the service advisor because if you're going to bring your vehicle to the dealership they will help you out and look past things more often than not if you build a good relationship with them. I would just point out that you did the numbers and that there's actually less of a difference now and with the originals so you should be even better than you were before.

[glennbk]

Staggered tires have half the tread depth warranty. 20" rims get 22,500 mile coverage.

[X3dr1ver]

Michelin; Very good tires, but they have priced themselves entirely out of the market. In Europe anyway closing in on 300euro/tire while the other A listers can be bought for ~200
Or even better, my new go-to brand Nexen for ~150. I was always a Michelin boy but i've now worn through multiple set's on Nexens on multiple cars and the performance is exactly the same (sporty street driving)

[glennbk]

You buy tire commensurate to the car. If you can't afford the tires, you can't afford the car.

[X3dr1ver]

Originally Posted by glennbk

You buy tire commensurate to the car. If you can't afford the tires, you can't afford the car.

"Because I drive an expensive car, I should waste money on overpriced products that are of no benefit compared to a cheaper alternative"

I'm sorry but that's just reta.... a less intelligent way of thinking.

[Hoppie]

Can someone confirm 255/40 & 295/35 setup aren't a problem on higher speeds? I live close to Germany so go flat out every now and then.

[Hoppie]

Originally Posted by SimSimma941

A sincere thank you to everyone (especially Ice9) who contributed to this thread and others! I just purchased my M40i certified and was told they don’t make an all season for the 21” rim so I went with the 19”. Now I know I can get the 21” rims (718M) with an AS non-run flat and be fully content with my purchase. I love the width the the 295/35 and the stance looks great.

There was a mention of a speed rating with the larger MPS4-AS tire on the 9.5” rear rims. At what speed is the tire in the danger zone? I don’t plan to drive at high speeds often but want the option and to feel safe doing it.

**Also I will be selling my 19” 698M with RF-AS less than 1,000 miles on them. Could be a good rim to throw true winters tires on but I don’t have the space to store them.

Have you heard anything about everything goes well on higher speeds?

[glennbk]

Originally Posted by X3dr1ver

"Because I drive an expensive car, I should waste money on overpriced products that are of no benefit compared to a cheaper alternative"

I'm sorry but that's just reta.... a less intelligent way of thinking.

Yes, they are made to a price point. I won't argue with you on the reliability nor the life span on these tires. There is plenty of information on the web. And, I stand by my statement that if you can't afford the tires, you can't afford the car.

[mfractal]

question to those running this setup. what tire pressures are you using ? i find the recommended 34/36 very hard even with non run flats. i went down to 31/33 and it much more comfy but i wonder if its too low.

[Replicant]

Has anyone tried the Michelin Primacy Tour A/S tires with these wheels? I have had my 718M's in storage for nearly 5 years and just run 19's due to the tire options. I noticed that this tire comes in our sizes, although the front tires are made to be OEM for Hyundia/Genesis I believe.

On a positive, looks like you can now get the PS4S in stock sizes, but I am not about to pay $2500-$3000 for a set of tires of this car that will probably last 15k miles.

[svic628]

Originally Posted by Replicant

Has anyone tried the Michelin Primacy Tour A/S tires with these wheels? I have had my 718M's in storage for nearly 5 years and just run 19's due to the tire options. I noticed that this tire comes in our sizes, although the front tires are made to be OEM for Hyundia/Genesis I believe.

On a positive, looks like you can now get the PS4S in stock sizes, but I am not about to pay $2500-$3000 for a set of tires of this car that will probably last 15k miles.

If you run 255/40 285/35 the PS4S end up cheaper. 1900 plus tax instead of 2200-2300 for 245/275

[OciWan]

Originally Posted by Replicant

Has anyone tried the Michelin Primacy Tour A/S tires with these wheels? I have had my 718M's in storage for nearly 5 years and just run 19's due to the tire options. I noticed that this tire comes in our sizes, although the front tires are made to be OEM for Hyundia/Genesis I believe.

On a positive, looks like you can now get the PS4S in stock sizes, but I am not about to pay $2500-$3000 for a set of tires of this car that will probably last 15k miles.

I am running the Primacy A/S on my 718 rims, X4 m40. I’ve had them for two years and have had no issues. I found the ride to be quieter and more comfortable than the stock Alenza run flats.