Speedometer adjustment with larger tires

greiswig · **Posted:** Thu Dec 08, 2005 4:51 pm

I found one other post about this in the tire section, but no responses.

Is anyone aware of a way to adjust the speedometer/odometer when you move to larger tires? I have a 2005, FYI.

Thanks!

oldnavy · **Posted:** Thu Dec 08, 2005 6:38 pm

Only adjustment would be with the StartScan if it has a slection for the Jeeps like it does for the LX (Magnum, 300C, Charger) cars , and those are limited to the optional sizes available across the LX line.

greiswig · **Posted:** Fri Dec 09, 2005 4:43 pm

oldnavy wrote:

Only adjustment would be with the StartScan if it has a slection for the Jeeps like it does for the LX (Magnum, 300C, Charger) cars , and those are limited to the optional sizes available across the LX line.

Not familiar with that device. Can you point me in the right direction, Old Navy?

Guyute1210 · **Posted:** Fri Dec 09, 2005 5:34 pm

Don't change the Speedo. You will get more mileage out of your Warrenty.

(ps, this may or may not be legal.) :twisted:

oldnavy · **Posted:** Fri Dec 09, 2005 6:49 pm

greiswig wrote:

oldnavy wrote:

Only adjustment would be with the StartScan if it has a slection for the Jeeps like it does for the LX (Magnum, 300C, Charger) cars, and those are limited to the optional sizes available across the LX line.

Not familiar with that device. Can you point me in the right direction, Old Navy?

It's the scan tool used by Chrysler/Dodge/Jeep dealers on the LX series cars and CRD and couple of other modles I think to check for codes or reprogram the onboard computers.

corwyyn · **Posted:** Sat Dec 10, 2005 1:13 am

The only confirmed way that I have heard to have the speedo adjusted is to have a dealer flash the ECM with the new tire size. I'm not sure if I would worry about it; I went from 215s to 235s and compared to my GPS the speedo is spot on (over a 400 mile trip my odometer was only 1 mile off compared to the GPS odometer - thats about 1/4 of 1% error).

Globel User · **Joined:** Sun Jul 10, 2005 1:03 am **Posts:** 45

Greiswig, here is a address to online calculators. Hope this helps, Don

http://www.rocky-road.com/calculator.html

greiswig · **Posted:** Sun Dec 11, 2005 12:51 pm

Thanks, all.

Speedometer adjustment with larger tires

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