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  #13  
Old 03-17-2014, 02:46 AM
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Re: Advantage of 20" rims over 18"?

They look like these:

https://www.mopar.com.au/Pages/Store...ils.aspx?D=163

There are a few things to think about when going to a wheel shop for these. The stud pattern is 5x5 and the offset is 56.4mm. The offset can change a little, but make sure it doesn't sit out too far.

There are a few manufacturers who make rims that will fit, KMC, ATX and Fuel are some that I have seen. Here's an example with a 35mm offset:
ATX AX181-Artillery 18" x 8" +35 | Murchison Products AEV QLD Distributor
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  #14  
Old 03-17-2014, 03:02 AM
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Re: Advantage of 20" rims over 18"?

Thanks Benn0, which way does the offset go?
Bigger the offset the more the tyres sit inside or outside the guards?
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Old 03-17-2014, 03:10 AM
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The smaller the offset the more your wheels are going to stick out. If you are going to swap wheels do it when your wheels are brand new so they are worth something resale (I scuffed mine and wrecked a tyre off-roading before making the switch). I went with these, 4 rims and tyres delivered for $2,550

image-3672858835.jpg
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Old 03-17-2014, 03:16 AM
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Re: Advantage of 20" rims over 18"?

Yeah, those KMC Monsters look good.
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Old 03-17-2014, 06:12 AM
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Re: Advantage of 20" rims over 18"?

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Originally Posted by Benn0 View Post
You would probably be better off buying the rims online (a dealer was selling them of $50 a rim recently, but they went quick).
As you've probably noticed, I am not on AJOR that often. I saw that post about 10hrs too late, otherwise I would have purchased at least 5. One to replace the boring spare, and a fresh set of 4 for the future.
Oh well.
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  #18  
Old 03-17-2014, 06:49 AM
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I would choose some rims you like and tyres that will suite you and keep the oem 20" for when you sell it or for on road. Swapping them at a dealer will just be your loss as the oem 18" will not have am off-road tyre, as they are just all season.
The 20" oem wheels are like $2500 each from a dealer


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  #19  
Old 03-18-2014, 06:34 AM
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Quote:
Originally Posted by SLLJG View Post
"Am I missing something?"

No, you're not. A wheel only has to have a diameter large enough to clear the brakes. Beyond that requirement, the size of the wheel is a matter of appearance.
The bigger the wheel, all else being equal, the greater the unsprung weight, the greater the turning circle, and the harsher the ride.

The principal reason for 19-inch, 20-inch, and even larger wheels is bling.

My 2014 Jeep Grand Cherokee Overland would be fine with 16-inch or even 17-inch wheels, but it came with 18-inch wheels, which I accept. I didn't buy a Summit for several reasons, one of which is that it has 20-inch wheels.

Perhaps people who put 21-inch or 22-inch wheels on their cars and trucks are indifferent to the dynamics of the vehicles.
You contradict yourself. You are right in that the wheels have to be big enough to clear the brakes. This is why nothing smaller than a 18" wheel will fit.
Wheels are getting bigger every year. This is because manufacturers are creating more efficient vehicles. A larger circumference requires a bigger diameter. The larger the circumference, the less rolling resistance and more efficient the wheel becomes. Compare a BMX bike to a road race bike. The larger wheel enables the bike to remain more stable at higher speeds. Same principal with cars.
When off roading, the tyre profile comes into play. The larger the profile the bigger the footprint the tyre has. This was why you should go with a smaller wheel if off roading as the tyre profile is larger. Circumference remains roughly the same.
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Old 03-18-2014, 06:44 AM
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Re: Advantage of 20" rims over 18"?

Quote:
Originally Posted by iboughtajeep View Post
You contradict yourself. You are right in that the wheels have to be big enough to clear the brakes. This is why nothing smaller than a 18" wheel will fit.
Wheels are getting bigger every year. This is because manufacturers are creating more efficient vehicles. A larger circumference requires a bigger diameter. The larger the circumference, the less rolling resistance and more efficient the wheel becomes. Compare a BMX bike to a road race bike. The larger wheel enables the bike to remain more stable at higher speeds. Same principal with cars.
When off roading, the tyre profile comes into play. The larger the profile the bigger the footprint the tyre has. This was why you should go with a smaller wheel if off roading as the tyre profile is larger. Circumference remains roughly the same.
No they keeping going to larger wheels for looks. Road bikes stable at higher speeds? Maybe and maybe not. Define tire profile? Bigger footprint? A wider tire can actually be a problem in mud and snow where narrowest is best. Look at WRC cars running on pavement vs snow at Monte Carlo and Sweden. More sidewall is an advantage off road. Depending on the condition of paved roads where you live and how much off roading you do will help you make the choice in wheel size. You never push your WK2 anywhere close to limits on pavement to need the tenth of a g the 50 series tire will give you over the 60 series.
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Old 03-18-2014, 08:00 AM
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Quote:
Originally Posted by Setoutguy View Post

No they keeping going to larger wheels for looks. Road bikes stable at higher speeds? Maybe and maybe not. Define tire profile? Bigger footprint? A wider tire can actually be a problem in mud and snow where narrowest is best. Look at WRC cars running on pavement vs snow at Monte Carlo and Sweden. More sidewall is an advantage off road. Depending on the condition of paved roads where you live and how much off roading you do will help you make the choice in wheel size. You never push your WK2 anywhere close to limits on pavement to need the tenth of a g the 50 series tire will give you over the 60 series.
The fact they look better is not the reason. Width of a tyre is not the foot print you need when 4x4'ing.

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Old 03-18-2014, 08:31 AM
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Re: Advantage of 20" rims over 18"?

Quote:
Originally Posted by iboughtajeep View Post
You contradict yourself. You are right in that the wheels have to be big enough to clear the brakes. This is why nothing smaller than a 18" wheel will fit.
Wheels are getting bigger every year. This is because manufacturers are creating more efficient vehicles. A larger circumference requires a bigger diameter. The larger the circumference, the less rolling resistance and more efficient the wheel becomes. Compare a BMX bike to a road race bike. The larger wheel enables the bike to remain more stable at higher speeds. Same principal with cars.
When off roading, the tyre profile comes into play. The larger the profile the bigger the footprint the tyre has. This was why you should go with a smaller wheel if off roading as the tyre profile is larger. Circumference remains roughly the same.
If you are going for fuel economy you want smaller wheels not larger, you contradicted yourself as well, you said they are going with larger wheels which leads to more circumference yet said to go off road use a smaller wheel and the circumference stays the same.
You want the smaller wheel for fuel mileage because a 20" wheel and tire combo will weigh more than a 17" wheel and tire combo, less weight means more fuel economy, I went from a 17" to a 18" wheel on my fusion, I lost 2-3 mpg on average.
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Old 03-18-2014, 08:58 AM
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Quote:
Originally Posted by iboughtajeep View Post
The fact they look better is not the reason. Width of a tyre is not the foot print you need when 4x4'ing.

Attachment 37103
The width matters very much. Take any new fwd sedan with their 225 or bigger width tires and drive in snow, then put a 175 width tire on and see the difference.
I see what you are saying about the footprint but I think the differences aren't big enough to make much of a difference.
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Old 03-18-2014, 09:31 AM
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Re: Advantage of 20" rims over 18"?

Quote:
Originally Posted by iboughtajeep View Post
The fact they look better is not the reason. Width of a tyre is not the foot print you need when 4x4'ing.

Attachment 37103
I am offroad weekly and have forgotten more about tires than most folks since I used to be responsible for tires, suspension and brakes on various 934s, 935s and 962s. The difference in width between a 50 series and 60 series tires on GC both on and offroad isnt going to make any real world difference until you get to either mud or snow. More sidewall is a benefit offroad. Last Saturday field conditions went from dry to damp grass to nice mud. Conditions also changed from the early morning to the afternoon when temps were in the upper 60's F and if you waited 36hrs temps were in the upper 20's F with 10+ inches of snow on the ground by Monday morning. Winter tires are going into hibernation some time this week. Time to put the LAtitudes back on and begin thinking about new 3 season tires.
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