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Staggered Tire Setup in RWD #4440734
06/24/17 11:38 PM
06/24/17 11:38 PM
Joined: Aug 2004
Posts: 302
San Diego
FlyPenFly Offline OP
FlyPenFly  Offline OP
Joined: Aug 2004
Posts: 302
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...


2014 Mercedes GLK350 3.5L DFI
2014 Mercedes E350 Coupe 3.5L DFI
2007 Suzuki Grand Vitara 2.7L V6
Re: Staggered Tire Setup in RWD [Re: FlyPenFly] #4440746
06/25/17 12:00 AM
06/25/17 12:00 AM
Joined: Jan 2011
Posts: 2,943
PV Az
AZjeff Offline
AZjeff  Offline
Joined: Jan 2011
Posts: 2,943
PV Az
ABS will hate it.


86 Samurai 1.3 leftovers
14 RAV4 2.5 5W-20 PP
16 Silverado 1500 4.3, DI, AFM 5W-30 PP

The most important thing to do in your life is to not interfere with someone else's life. - Frank Zappa

Re: Staggered Tire Setup in RWD [Re: FlyPenFly] #4440764
06/25/17 01:01 AM
06/25/17 01:01 AM
Joined: Aug 2004
Posts: 302
San Diego
FlyPenFly Offline OP
FlyPenFly  Offline OP
Joined: Aug 2004
Posts: 302
San Diego
You think with just a 10mm difference in width same height?


2014 Mercedes GLK350 3.5L DFI
2014 Mercedes E350 Coupe 3.5L DFI
2007 Suzuki Grand Vitara 2.7L V6
Re: Staggered Tire Setup in RWD [Re: FlyPenFly] #4440768
06/25/17 01:26 AM
06/25/17 01:26 AM
Joined: Oct 2005
Posts: 11,363
PA
d00df00d Offline
d00df00d  Offline
Joined: Oct 2005
Posts: 11,363
PA
That second number is aspect ratio, not height. 245/45 will have slightly more height than 235/45.


2011 Mazda RX-8 R3
Mobil Super 5w-20
Re: Staggered Tire Setup in RWD [Re: FlyPenFly] #4440835
06/25/17 06:31 AM
06/25/17 06:31 AM
Joined: Dec 2013
Posts: 3,989
Manchester, England
Olas Offline
Olas  Offline
Joined: Dec 2013
Posts: 3,989
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.


Cable ties should hold it
Re: Staggered Tire Setup in RWD [Re: FlyPenFly] #4440841
06/25/17 06:43 AM
06/25/17 06:43 AM
Joined: Dec 2002
Posts: 40,860
'Stralia
Shannow Offline
Shannow  Offline
Joined: Dec 2002
Posts: 40,860
'Stralia
If your car can tolerate worn tyres at one end and new tyres at the other, it can tolerate that.

Re: Staggered Tire Setup in RWD [Re: FlyPenFly] #4440848
06/25/17 06:56 AM
06/25/17 06:56 AM
Joined: Sep 2010
Posts: 6,990
Texas
4WD Offline
4WD  Offline
Joined: Sep 2010
Posts: 6,990
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.

Re: Staggered Tire Setup in RWD [Re: FlyPenFly] #4440859
06/25/17 07:23 AM
06/25/17 07:23 AM
Joined: Feb 2003
Posts: 3,421
Somewhere in the US
CapriRacer Offline
CapriRacer  Offline
Joined: Feb 2003
Posts: 3,421
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.


CapriRacer

Visit my web site: www.BarrysTireTech.com
Re: Staggered Tire Setup in RWD [Re: FlyPenFly] #4440895
06/25/17 08:17 AM
06/25/17 08:17 AM
Joined: Dec 2002
Posts: 42,085
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,085
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.

Re: Staggered Tire Setup in RWD [Re: Shannow] #4440923
06/25/17 08:53 AM
06/25/17 08:53 AM
Joined: Oct 2008
Posts: 19,089
Sunny Florida
SteveSRT8 Offline
SteveSRT8  Offline
Joined: Oct 2008
Posts: 19,089
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.


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: Staggered Tire Setup in RWD [Re: FlyPenFly] #4440957
06/25/17 09:50 AM
06/25/17 09:50 AM
Joined: Mar 2008
Posts: 6,811
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 6,811
USA
It probably won't hurt anything, but there's no point in doing it, either smile

Re: Staggered Tire Setup in RWD [Re: FlyPenFly] #4441189
06/25/17 02:52 PM
06/25/17 02:52 PM
Joined: Aug 2003
Posts: 12,897
NE,Ohio
Rand Online content
Rand  Online Content
Joined: Aug 2003
Posts: 12,897
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.


2019 Jeep Cherokee Trailhawk 2.0T
Re: Staggered Tire Setup in RWD [Re: FlyPenFly] #4441237
06/25/17 03:47 PM
06/25/17 03:47 PM
Joined: Aug 2004
Posts: 302
San Diego
FlyPenFly Offline OP
FlyPenFly  Offline OP
Joined: Aug 2004
Posts: 302
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
Re: Staggered Tire Setup in RWD [Re: FlyPenFly] #4441238
06/25/17 03:52 PM
06/25/17 03:52 PM
Joined: Sep 2010
Posts: 6,990
Texas
4WD Offline
4WD  Offline
Joined: Sep 2010
Posts: 6,990
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 ...

Re: Staggered Tire Setup in RWD [Re: FlyPenFly] #4441250
06/25/17 04:01 PM
06/25/17 04:01 PM
Joined: Aug 2004
Posts: 302
San Diego
FlyPenFly Offline OP
FlyPenFly  Offline OP
Joined: Aug 2004
Posts: 302
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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