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mlc317 01-19-2011 11:37 AM

Rim change/computer flash
Hey everybody i recently upgraded my stock 17 inch rims to aftermarket 20 inch rims. I was wondering if you have to get the computer reflashed because of the size difference. I asked my service guy before i changed the rims and he said you didn't really need to, he said the size difference would only affect the speeddomoter. Is this true, any help would be greatly appreciated.

wermbang 01-19-2011 11:39 AM

The dealer can change it so your speedometer is accurate. Whats the difference in overall height? including the tires, if nothing chagned there I wouldn't worry about it

mlc317 01-19-2011 11:56 AM

Well the truck with the 17 inch rims i upgraded to the 20 x 9's and i kept the factory size for the twenty's that dodge uses on the trucks, so basically i went with the stock setup for the truck if it came with the twenty's.

RamTech 01-19-2011 12:17 PM

You still need to have the upgraded size programmed. It's easy to do and only takes a few minutes.

RootBeer 01-19-2011 12:47 PM

If the tire size stayed the same the speedometer won't be affected by the size of rim.

Example: 275/60/17 and 275/60/20 are the same size tire, just different wheel/rim size so they will still spin at the same speed.

mlc317 01-19-2011 12:50 PM

If you don't have the computer reflashed can it do any damage to the truck in any way!!

TheSatinPumpkin 01-20-2011 08:32 AM

Whats your old and new tire sizes?

rinkerman 01-20-2011 08:38 AM

Rootbeer's answer that a 275/60/17 & 275/60/20 would be the same overall size is wrong. A 275/60/17 would have 693 revs per mile while a 275/60/20 would be 630 revs per mile. The difference would be big enough to require the computer to be reflashed. If you have a tuner you could change your self.

You find a 20" tire that would be the same size. A 275/45/20 would have 697 revs per mile - close enough.

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