Tires changing from stock 20" Fortera to 275/55/R20 - Jeep Garage - Jeep Forum

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Old 02-15-2015, 11:46 PM
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Tires changing from stock 20" Fortera to 275/55/R20

Hey guys,

Not long ago I changed tires on my 2013 Jeep Grand Cherokee Overland Summit w Quadra Track II. From stock 265/50/R20 Fortera to Goodyear Eagle Sport 275/55/R20 - (all season, speed rating 117V). So these is running successfully without rubbing or hitting the control arm bolt on all types of Quadra Lift (include the lowest one - Sport). I think these tires the best chose for highway driving. No noise and no reaction to speed bumps. I hope my experience will be helpful to Grand Cherokee owners.

Thanks.

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Old 02-17-2015, 03:48 AM
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Re: Tires changing from stock 20" Fortera to 275/55/R20

Thanks for sharing this data point. I think I will change to this size when I get my next set of tires. What are you using for your spare size now? Did you get a matching fifth or did you go with something like 255/70/R18?

Quote:
Originally Posted by jeep-gsg View Post
Goodyear Eagle Sport 275/55/R20 - (all season, speed rating 117V). So these is running successfully without rubbing or hitting the control arm bolt on all types of Quadra Lift (include the lowest one - Sport).
Actually, the lowest QL mode is Entry/Exit (approximately 25mm/1" lower than Aero). This is relevant, because with the auto-lower suspension enabled the vehicle will drive at low speed remaining in this mode.

Others have said 275/55/R20 fits on QL, so I presume it's clear of rubbing in that scenario too. Is that your experience?
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Old 02-17-2015, 09:04 AM
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Re: Tires changing from stock 20" Fortera to 275/55/R20

One other factor that needs to be understood is that when you up-size the diameter of the your shoes, your speedo/odo are not going to be accurate. That's not a "problem" but it is something you need to be aware of, especially in "speed sensitive areas"...
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Old 02-17-2015, 09:50 PM
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Re: Tires changing from stock 20" Fortera to 275/55/R20

Hi,
I didn't change tire on the spare wheel, still keep original one.

You are right, the lowest one is PARK range (lower than SPORT), but I didn't use this type for driving on the road. And any way, nothing rubbing on the PARK range. I have checked it on my parking lot.

Thanks
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Old 02-18-2015, 06:39 AM
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Re: Tires changing from stock 20" Fortera to 275/55/R20

Quote:
Originally Posted by jeep-gsg View Post
nothing rubbing on the PARK range. I have checked it on my parking lot.
Thanks for confirming!

EDIT: Well, damn. Looks like the 2014+ may be different: http://www.jeepgarage.org/f73/vechil...ide-84373.html

Quote:
I didn't change tire on the spare wheel, still keep original one.
Presuming your original spare is like mine and is a 245/65/18 then there is a substantial difference between your tires' outer diameter (31.9" vs 30.5", which is 811 mm vs 776 mm). Your larger tires will be turning about 632x a mile whereas that stock spare will be turning 661x.

I'm uncertain how far one could go using that much difference without causing drivetrain damage. Here's a recent thread about this debate. You will have to decide for yourself, but in case you weren't aware of the potential issues I thought I would let you know.

FYI: others have confirmed that a closer match like a 255/70/18 will fit on your spare rim, fit in the spare compartment, and still allow the lid to close (albeit those molded removable plastic side trays in there around the sides of the spare won't fit anymore). I think I will look into getting a used tire in that size for my spare when I switch to the 275/55/20's.

Thanks again for the info.
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Old 02-18-2015, 09:43 AM
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Re: Tires changing from stock 20" Fortera to 275/55/R20

Roadkill is correct...except for very short duration at lower speeds to get you to a service point, a mis-matched spare is not a good thing for any 4x4 vehicle. The tire diameters on all four corners need to match within a very small margin within specification for normal operation for both distance and speed.
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Old 02-19-2015, 10:37 PM
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Re: Tires changing from stock 20" Fortera to 275/55/R20

You are right about the spare tire. For safety reason, it is necessary to change the spare tire to bigger size accordingly to my larger tires.
Unfortunatly I totally missed this point.

Thank you for your warning.
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Old 02-20-2015, 09:28 AM
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Re: Tires changing from stock 20" Fortera to 275/55/R20

Safety is part of it...the integrity of your 4x4 drive train is the major factor at play here. You don't need a fancy tire or even the exact same tire for your spare...it just needs to match the diameter of what you are running at the four corners normally. The factory "full size" spare is a narrower tire than the OEM Forteras (and therefore fits below the lid), but it is the same diameter. You'll just need to view the sizing tables for any tire you are considering for the spare and match up that one figure to select what you need. Wheel diameter doesn't matter, so you can use the OEM 18" wheel. Just upsize the tire accordingly.
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Old 02-20-2015, 10:02 AM
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Quote:
Originally Posted by Jim_in_PA View Post
Wheel diameter doesn't matter, so you can use the OEM 18" wheel. Just upsize the tire accordingly.
255/70/18 is the equivalent "thin spare" size match for his 275/55/20 that will fit the 18" stock spare rim. Anything else isn't going to fit in the spare tire area and still allow the lid to close.
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Old 02-20-2015, 01:49 PM
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Re: Tires changing from stock 20" Fortera to 275/55/R20

Yea, that "hole" under the deck is only so big!
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Old 02-22-2015, 02:00 PM
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Re: Tires changing from stock 20" Fortera to 275/55/R20

Which rims do you have - and have you considered using spacers to pop the wheels out 1 or 1.25 inches?
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Old 02-22-2015, 03:28 PM
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Re: Tires changing from stock 20" Fortera to 275/55/R20

whats the facination with spacers in the us?
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