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Hi, new to this site and brand new to being a Jeep owner. We just bought a 2020 Grand Cherokee Overland. It's got 20" rims on it and the tire options for 20" are not great if you want to find a good all terrain tire that allows you to do some moderate off road driving and still provide a good ride on the highway. I talked to the Jeep dealership we bought it from and they are not recommending downsizing stating the vehicle's suspension, 4WD, etc. was designed around the 20" wheel. I'm not sure I buy that, if I put a tire on an 18" rim that has the same diameter and width of the tires currently on it, should it really matter? Along the same topic, how do I find out what the offset is on the current rims that are on the vehicle? So if I do put 18s on there I can match the offset as well.

Thanks for all the input, we are very excited to be a Jeep owner and I foresee more in our future.
 

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Agreed. The dealer just didnt have 18's to sell you so they didnt care about your question. Go for it. You should get a smoother ride out of the switch. If you cant find the offset online, you might have to just measure it. However, since a smaller diameter wheel is likely to be a smaller width, backspacing will also be an important measurement to consider. You will have to reduce the offset by the same amount as the backspacing in order to keep the outside edge of the wheel in the same location and keep the Jeep looking right.
 

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OEM Backspacing = 56.4mm

Optimum clearance appears to be with 18x8 with 32mm backspacing.

All WK2 models can use any of the wheels for the other models with 2 exceptions.

You can't put anything smaller than 18s if you have the HD (vented) brakes that came on the towing pack and you can't run the SRT (Brembo) brakes without the SRT wheels.

If you have the standard brakes you can even run 17s from the Wrangler.


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I have a 2017 Grand Cherokee Trailhawk that came with factory 18" rims. Certainly 18" rims will give you better options for A/T tires versus 20".
 

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JDJensen:
I've attached a picture of the stock 18" Jeep Grand Cherokee Trailhawk wheel with a stock profile A/T tire, in this a Bridgestone Dueler A/T Revo 3 265/60R18. Hope this helps with your decision. Personally, I wish there was a 17" wheel that would fit the WK2, (more tire choices) but these 18" wheels work well and I'm happy with the set up. I hope this helps with your decision.
Quadra Drive.

Wheel Tire Vehicle Automotive tire Locking hubs
 

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JDJensen:
I've attached a picture of the stock 18" Jeep Grand Cherokee Trailhawk wheel with a stock profile A/T tire, in this a Bridgestone Dueler A/T Revo 3 265/60R18. Hope this helps with your decision. Personally, I wish there was a 17" wheel that would fit the WK2, (more tire choices) but these 18" wheels work well and I'm happy with the set up. I hope this helps with your decision.
Quadra Drive.

View attachment 13255
That setup looks good!
 

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For the mild off-roading and forest service road wheeling I do, the stock wheels + Bridgestone Dueler ATs + Quadra Drive 2 AWD system works well. I come prepared for self-recovery, but don't worry too much about getting stuck.

Quadra Drive
 
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