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#4440734 - 06/24/17 11:38 PM Staggered Tire Setup in RWD
FlyPenFly Offline


Registered: 08/04/04
Posts: 250
Loc: San Diego
2014 GLK 350, RWD model not AWD.

Car came with the AMG package which included 20" special AMG wheels with 235 45 20 tires all around.

Would it be a big problem to run 245 45 20 in the rear and 235 45 20 in the front? I have a set for the rear from a friend that are nearly new. All tires are Pirelli Scorpions.

Don't want traction control or something to go crazy...
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2014 Mercedes GLK350 3.5L DFI
2014 Mercedes E350 Coupe 3.5L DFI
2007 Suzuki Grand Vitara 2.7L V6

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#4440746 - 06/25/17 12:00 AM Re: Staggered Tire Setup in RWD [Re: FlyPenFly]
AZjeff Offline


Registered: 01/14/11
Posts: 2642
Loc: PV Az
ABS will hate it.
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#4440764 - 06/25/17 01:01 AM Re: Staggered Tire Setup in RWD [Re: FlyPenFly]
FlyPenFly Offline


Registered: 08/04/04
Posts: 250
Loc: San Diego
You think with just a 10mm difference in width same height?
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2014 Mercedes E350 Coupe 3.5L DFI
2007 Suzuki Grand Vitara 2.7L V6

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#4440768 - 06/25/17 01:26 AM Re: Staggered Tire Setup in RWD [Re: FlyPenFly]
d00df00d Online   content


Registered: 10/20/05
Posts: 11212
Loc: PA
That second number is aspect ratio, not height. 245/45 will have slightly more height than 235/45.
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#4440835 - 06/25/17 06:31 AM Re: Staggered Tire Setup in RWD [Re: FlyPenFly]
Olas Offline


Registered: 12/11/13
Posts: 3933
Loc: Manchester, England
Go to the website www.willtheyfit.com and plug in your tyre sizes - it will calculate for you the difference in rolling diameter. Off the top of my head I think about 10-12mm?

Look in the owners handbook for information on tyre size - many 4wd/AWD cars mandate the same size on every corner but many also allow a %age difference before any issues are encountered. By simple reckoning, if 4wd can tolerate different sizes rwd can too.
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#4440841 - 06/25/17 06:43 AM Re: Staggered Tire Setup in RWD [Re: FlyPenFly]
Shannow Online   content


Registered: 12/12/02
Posts: 39870
Loc: 'Stralia
If your car can tolerate worn tyres at one end and new tyres at the other, it can tolerate that.

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#4440848 - 06/25/17 06:56 AM Re: Staggered Tire Setup in RWD [Re: FlyPenFly]
4WD Offline


Registered: 09/21/10
Posts: 6378
Loc: Texas
There are several tire speed calculators you can Google up - at least get the speed difference as a basis for what variances the ABS and roll over protection can tolerate. Sometimes you can find these kind of threads on sites specific to a vehicle/make.

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#4440859 - 06/25/17 07:23 AM Re: Staggered Tire Setup in RWD [Re: FlyPenFly]
CapriRacer Offline


Registered: 02/22/03
Posts: 3369
Loc: Somewhere in the US
If I recall correctly, the Mercedes ABS is kind of sensitive to tire diameter, and even changing tire size all around can affect its operation - again, if I remember correctly.

Besides, a 255/40R20 would be a much better match on diameter.
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#4440895 - 06/25/17 08:17 AM Re: Staggered Tire Setup in RWD [Re: FlyPenFly]
JHZR2 Offline



Registered: 12/14/02
Posts: 41786
Loc: New Jersey
I have a car that came OE with a staggered setup (bmw 135i). Its fine I guess, and I'll get 25k+ of life out of high performance summer tires, so I can't complain much about not rotating. But personally, if I had the option, I'd not do it.

That said, if you need tires anyway, and have a compelling deal in a used set, its possibly worth the chance.

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#4440923 - 06/25/17 08:53 AM Re: Staggered Tire Setup in RWD [Re: Shannow]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 18954
Loc: Sunny Florida
Originally Posted By: Shannow
If your car can tolerate worn tyres at one end and new tyres at the other, it can tolerate that.


This sounds like the debate over MDS in new gen Hemis. The mfgr builds in a bit of tolerance, the only thing here is how much.
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#4440957 - 06/25/17 09:50 AM Re: Staggered Tire Setup in RWD [Re: FlyPenFly]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6166
Loc: USA
It probably won't hurt anything, but there's no point in doing it, either smile

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#4441189 - 06/25/17 02:52 PM Re: Staggered Tire Setup in RWD [Re: FlyPenFly]
Rand Offline


Registered: 08/20/03
Posts: 12643
Loc: NE,Ohio
As capriracer noted a staggered setup is 2 different tire sizes with similar diameter..

and 255/40r20 is alot closer diameter than 245/45r20


To put it simply:
The second number is the sidewall height as a percentage of the section width

Section width is basically the width of the tire.. the tread width is slightly smaller.

Therefore if you keep the same aspect ratio(second number) and make the tire wider.. its also has taller sidewalls.. in this case the rolling diameter increases by aprox 8-10mm

If that is too complicated just throw them into a tire size calculator and see what the allowable spec is for your car usually hidden somewhere in the owners manual.

It might be off too far for the ABS system etc.
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#4441237 - 06/25/17 03:47 PM Re: Staggered Tire Setup in RWD [Re: FlyPenFly]
FlyPenFly Offline


Registered: 08/04/04
Posts: 250
Loc: San Diego
Slightly more than a 1% difference in height... nothing in the manual.
_________________________
2014 Mercedes GLK350 3.5L DFI
2014 Mercedes E350 Coupe 3.5L DFI
2007 Suzuki Grand Vitara 2.7L V6

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#4441238 - 06/25/17 03:52 PM Re: Staggered Tire Setup in RWD [Re: FlyPenFly]
4WD Offline


Registered: 09/21/10
Posts: 6378
Loc: Texas
Thinking a bit more - wouldn't the dashboard message you if it pings the four corners a few times and does not like wheel speed - if so, the risk is just tire mounting costs ...

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#4441250 - 06/25/17 04:01 PM Re: Staggered Tire Setup in RWD [Re: FlyPenFly]
FlyPenFly Offline


Registered: 08/04/04
Posts: 250
Loc: San Diego
Well mounting, dismounting, and I'm paying him $180 for tires I might not be able to use and I have no where to put it.
_________________________
2014 Mercedes GLK350 3.5L DFI
2014 Mercedes E350 Coupe 3.5L DFI
2007 Suzuki Grand Vitara 2.7L V6

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