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  #1  
Old 01-13-2008, 04:54 AM
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Wheels/Tires

Has anyone put 18" wheels on a stock Excursion without any suspension or lift mods. (vehicle is never off road)

Looking to install 18" Aluminum wheels and some TBD tire combination. Do I need to keep the circumference as close to stock as possible so the rev/mile will not impact the vehicles speed reading?

Comments from those who have installed 18" wheels would be appreciated. Thanks

Tony
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Old 01-13-2008, 07:53 AM
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Hey Tony, great to have ya. You should be able to throw some 18s on there no problem. Like you said, just try to keep the OD to as close to factory as you can so your speedo will not be off. Other than that, I would say go for it.
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Old 02-04-2008, 04:47 AM
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I am looking to do something like that also. If you go with 18" rims what is the largest tire that will fit the stock suspension? I have a Edge Evolution 2 so it is my understanding I can program the speedo for the tire size I purchase.
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Old 02-04-2008, 12:32 PM
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I have 18" rims with 275/70/R18 tires on my EX - no lift, not rubbing works great.

Now in my calculations, these are 33" tires so they are not too close to stock (stock I think is 31"??)

You can use the links on this thread to figure out where you would stand with the specific rim and tire combo's you would like to run --> Tire Size Markings - What does it mean?

Mine came with the tires it has now, but when I get new tires, I'll more than likely try and get something a little closer to stock size.
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Old 02-04-2008, 12:39 PM
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Just for fun (I like using the first link) here is what the stock vs what I have looks like numbers wise. First number is stock, 2nd is my tire.
Quote:
Stock Tire - 265/75R16
Tire 1 - 275/70R18

Section Width: 10.43 in 265 mm
Section Width: 10.82 in 275 mm

Rim Diameter: 16 in 406.4 mm
Rim Diameter: 18 in 457.2 mm

Rim Width Range: 7 - 8 in
Rim Width Range: Unrecognized tire size.

Overall Diameter: 31.64 in 803.65 mm
Overall Diameter: 33.15 in 842.01 mm

Sidewall Height: 7.82 in 198.62 mm
Sidewall Height: 7.57 in 192.27 mm

Radius: 15.82 in 401.82 mm
Radius: 16.57 in 420.87 mm

Circumference: 99.39 in 2524.5 mm
Circumference: 104.1 in 2644.1 mm

Revs per Mile: 657.3
Revs per Mile: 627.4

Actual Speed: 60 mph 100 km/h
Speedometer1: 57.2 mph 95.4 km/h

Speedometer Difference: - Speedometer Difference: 4.765% too slow
Diameter Difference: - Diameter Difference: 4.56%
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Old 02-04-2008, 12:42 PM
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I was told within 3% is the limit before recalibration is needed.
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Old 02-04-2008, 12:43 PM
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I've actually wanted to do this for a while so thanks for the excuse to do this
Quote:
Stock Tire - 265/75R16
Tire 1 - 265/65R18

Section Width: 10.43 in 265 mm
Section Width: 10.43 in 265 mm

Rim Diameter: 16 in 406.4 mm
Rim Diameter: 18 in 457.2 mm

Rim Width Range: 7 - 8 in
Rim Width Range: 7.5 - 9.5 in

Overall Diameter: 31.64 in 803.65 mm
Overall Diameter: 31.56 in 801.62 mm

Sidewall Height: 7.82 in 198.62 mm
Sidewall Height: 6.78 in 172.21 mm

Radius: 15.82 in 401.82 mm
Radius: 15.78 in 400.81 mm

Circumference: 99.39 in 2524.5 mm
Circumference: 99.14 in 2518.1 mm

Revs per Mile: 657.3
Revs per Mile: 659.0

Actual Speed: 60 mph 100 km/h
Speedometer1: 60.1 mph 100. km/h

Speedometer Difference: - Speedometer Difference: 0.258% too fast
Diameter Difference: - Diameter Difference: 0.26%
That tire is pretty dang close (close enough), but I'm not sure I'd want a 65 series tire (ride would suffer me thinks).
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Old 02-07-2008, 10:37 AM
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You'll be fine. I put 20's on mine, and it did require a 1 inch lift in the front to stop the rubbing. Actually I doubt I would have needed that if I hadn't put on such a wide tire. My rims are 11" deep, and the tire is about 12". Had I not gone so wide, maybe i would have been fine.
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Old 02-07-2008, 10:59 AM
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the biggest difference in what size tires you can run is in what offset or backspacing the wheels are.with a 18X8-8.5 4-4.5" BP wheel you can run 33" tires very easily but now if you have a 18X10 with the same BP you will drop in tire size to keep them from rubbing so if you don't want to wide of a tire do a 18X8-8.5 wheel and then run a 275-65R18..just my thoughts
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