Another new owner question. I have the Limited with the 20" chrome clad wheels. Did your spare tire on a matching chrome clad wheel or the standard black rim?

 

i also have the 20" chrome , the spare is black.

 

Don't know, never had an issue. My guess is that the wheel is black.

 

I have the 20" my spare is an 18" hopefully the OD is the same otherwise will have a problem with the differential ratios, anyone know if they are the same OD, because on a AWD your aren't allowed to change tire sizes, and was wondering how long the spare could be used safely.

 

Just checked my spare tire size. It's 245-70R-17 with a black rim and the tires on the chrome rims are 265-50R-20. Will the different tire sizes be a problem if I ever need the spare?

 

You just need to check the actual diameter of the wheel and tire to see if they are approximately the same. That is the potential issue with different size wheels and tires.

I don't think the ESP system will work unless the diameters are very close to each other.

 

After checking the tire calculator at 1010tire.com I guess we're OK. Both sizes are pretty darn close (to my surprise I guess the Chrysler engineers have this covered).

Section Width: - -
Tire 1 - 265/50R20 Section Width: 10.43 in 265 mm
Tire 2 - 245/70R17 Section Width: 9.64 in 245 mm

Rim Diameter: - -
Tire 1 - 265/50R20 Rim Diameter: 20 in 508 mm
Tire 2 - 245/70R17 Rim Diameter: 17 in 431.8 mm

Rim Width Range:
Tire 1 - 265/50R20 Rim Width Range: 7.5 - 9.5 in
Tire 2 - 245/70R17 Rim Width Range: 6.5 - 8 in

Overall Diameter: - -
Tire 1 - 265/50R20 Overall Diameter: 30.43 in 772.92 mm
Tire 2 - 245/70R17 Overall Diameter: 30.50 in 774.7 mm

Sidewall Height: - -
Tire 1 - 265/50R20 Sidewall Height: 5.21 in 132.33 mm
Tire 2 - 245/70R17 Sidewall Height: 6.75 in 171.45 mm

Radius: - -
Tire 1 - 265/50R20 Radius: 15.21 in 386.33 mm
Tire 2 - 245/70R17 Radius: 15.25 in 387.35 mm

Circumference: - -
Tire 1 - 265/50R20 Circumference: 95.59 in 2427.9 mm
Tire 2 - 245/70R17 Circumference: 95.81 in 2433.5 mm

Revs per Mile: -
Tire 1 - 265/50R20 Revs per Mile: 683.5
Tire 2 - 245/70R17 Revs per Mile: 681.9