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Dodge Ram Wheels And Tires General discussion related to wheels and tires.


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  #1  
Old 01-19-2011, 12:37 PM
mlc317 mlc317 is offline
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Default 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.
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Old 01-19-2011, 12:39 PM
wermbang wermbang is offline
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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
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Old 01-19-2011, 12:56 PM
mlc317 mlc317 is offline
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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.
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Old 01-19-2011, 01:17 PM
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You still need to have the upgraded size programmed. It's easy to do and only takes a few minutes.
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Old 01-19-2011, 01:47 PM
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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.
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Old 01-19-2011, 01:50 PM
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If you don't have the computer reflashed can it do any damage to the truck in any way!!
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Old 01-20-2011, 09:32 AM
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Whats your old and new tire sizes?
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Old 01-20-2011, 09:38 AM
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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.

http://www.tirerack.com/tires/tires....=yes&tab=Specs
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