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Old 01-18-2011, 03:35 PM
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Wheels: Anyone running 18s winter / 20s summer?

Since 1) I can't seem to get an update on the "Premium" chrome package that was supposed to be out yesterday. and 2) It appears as though polished 20" wheels are only available on the Summit and not the Stone White that my wife wants...

Would there be any mechanical issues running both 18s (winter) and 20s (summer) on the Jeep..other than ride/handling difference?

I've run different size wheels on my cars for years, but the dealer spooked me a bit yesterday telling me that the suspension geometry for "trail rated" Jeeps is completely different than for non-trail rated Jeeps that run the 20" wheels.

I chalk that up to marketing and gimmickery but since I have this great forum as a resource I thought I would do a sanity check...

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Old 01-18-2011, 03:44 PM
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Re: Wheels: Anyone running 18s winter / 20s summer?

If you run the same overall height of tire you won't have a problem. The dealer is full of crap. I am considering this when I wear these tires out. Put a set of winter tires on these and then get a set of replica SRT's with a summer/rain tire.
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Old 01-18-2011, 04:11 PM
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Re: Wheels: Anyone running 18s winter / 20s summer?

I have nothing to base this on other than past experience (my '98 ZJ) but I currently have the polished 18's (my Limited is not trail rated, no ORA package) and I was looking to buy the 20s for the Spring/Summer.

When I approached the parts dept at Adam's Jeep they made no indication to me that switching the rims would present a serious ride problem (other than a normal comfort difference between 18" sidewalls and the lo-pro of the 20s - assuming the overall tire diameter remains nearly identical). Then again, I didn't specificaly ask either.

But, I highly doubt the geometry of the suspension is any different for a trail-rated Jeep. Dont the trail-rated jeeps just add skid plates and off-road tires with raised OWL? I could be way off here but I find it hard to believe that trail-rated JGC is more than a visual and marketing package.
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Old 01-18-2011, 04:12 PM
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Re: Wheels: Anyone running 18s winter / 20s summer?

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Originally Posted by Jpjr View Post

I've run different size wheels on my cars for years, but the dealer spooked me a bit yesterday telling me that the suspension geometry for "trail rated" Jeeps is completely different than for non-trail rated Jeeps that run the 20" wheels.
Your dealer is either a liar or a moron. Possibly both.

The outside wheel diameter is what matters, and the 17, 18, and 20 inch sizes for the WK2 are so close that the difference is absolutely negligible. Offset could be an issue, but that's more to do with the particular wheel- offset doesn't vary with wheel size; the offset for the 18" rims is the offset for the 20" rims.

I'd get some winter tires in the stock 18" size and not worry about it- it will not be a problem at all.
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Old 01-18-2011, 04:50 PM
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Re: Wheels: Anyone running 18s winter / 20s summer?

^+1 to the others commentary, that dealer is giving crappy if not misleading guidance

Like many others, I have 18's with AT rubber for mountain snow and trail setup, and 20's with all seasons for summer pavement. Most of this is for function, effective traction, and proper protection for specific driving conditions. It also costs less than an accident as another JG member points out. I'm also guilty of loving the 20's WK2 wheelset and spirited on-pavement driving habits even though the 18's would be acceptable year-round.

I'm running the same diameter and specs as stock rubber for the 18's and 20's - all is virtually identical for speedometer and clearance to wheel wells. It would only change if you run larger than spec rubber, as some do for the off-road traction benefits.

The butt dyno may notice a bit more cush with the 18's, but it really only is noticeable when there's an obstacle, rough conditions, or lesser pressures afforded by the 18's say for sand if so desired.

The QL is the same for trail and non-trail rated WK2's. I'd imagine the same could be said for non QL springs? As stated above trail rating comes primarily via skids, tow hooks, and 18" wheelset.
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Old 01-18-2011, 06:22 PM
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Re: Wheels: Anyone running 18s winter / 20s summer?

The only trim level where the "trail rating" means just 18" rims, skid plates, and tow hooks is the Overland. On the others, especially Laredos, more has to be added.

If you're getting an Overland, you can get the ORAII and then just pick up the 20" rims as an accessory. Or get it without ORAII and buy the plates, hooks, and 18" rims (you'll be out a badge, but you can opt for the black 18" rims, which look SWEEEEET).
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Old 01-18-2011, 07:10 PM
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Re: Wheels: Anyone running 18s winter / 20s summer?

I'm running both 18" & 20", and with my tire/wheel combo there's not really any difference in the ride or handling.

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Old 01-18-2011, 07:26 PM
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Re: Wheels: Anyone running 18s winter / 20s summer?

Quote:
Originally Posted by Technosavant View Post
The only trim level where the "trail rating" means just 18" rims, skid plates, and tow hooks is the Overland. On the others, especially Laredos, more has to be added.

If you're getting an Overland, you can get the ORAII and then just pick up the 20" rims as an accessory. Or get it without ORAII and buy the plates, hooks, and 18" rims (you'll be out a badge, but you can opt for the black 18" rims, which look SWEEEEET).
What about the full-size spare? Jeep Literature seems to imply that you need to pick up one of the Off Road groups to get a full spare.
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Old 01-18-2011, 08:54 PM
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Re: Wheels: Anyone running 18s winter / 20s summer?

I too am running with 265/60-18 Blizzaks and 265/50-20 Forteras. That's the smart way to go for snow country. Both have the same overall diameter so there is no effect on the speedometer readings.

I do find the Blizzaks slightly more firm/harsh compared to the Forteras but that improved once I decreased the Blizzak's pressures to 33 psi (20" are 36 psi).
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