Tire sizes
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More Turbo
Joined: Sep 2016
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From: Michigan
Tire sizes
How much can you change your tire size before it effects your speedometer. My VIN tag says it had 235s and it now has 265s. My boss's truck has 285s. What's the pros and cons of larger tires?
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More Turbo
Joined: Sep 2016
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From: Michigan
What would be the process of resetting the computer to read the speed of a bigger tire? A PCM reprogram? I know the dealer did one before I got the truck because it's written on a tag under the hood. Also does the tire size effect pulling power in anyway?
Laughing Gas
Joined: May 2006
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From: Massachusetts
A smaller tire will give you the net effect of shorter gears.
Laughing Gas
Joined: May 2006
Posts: 1,047
Likes: 6
From: Massachusetts
You have gear ratios in the differentials of your truck. The 6.2 comes with two choices stock 4.30’s or 3.73’s. The 4.30’s are shorter or deeper gears which put a bit more torque to the ground. 3.73’s are taller gears allowing less rpm’s and slightly better mileage. If you had 35” tires on your truck and then switched to say 30” tires it would be the same as swapping gears in your truck. Like going from 3.73’s to 4.30’s.
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Joined: Sep 2016
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From: Michigan
So for my 7.3 it's be the same but reverse because I'd be getting a step bigger tire correct? More torque less mileage?
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From: Michigan
Ah ok. So not much gain from a larger tires is what I'm getting. The difference between 265 and 285 shouldn't be too much though. There's a one inch sidewall difference and if I'm right the aspect ratio is the same. I'm switching from the Falken Rocky Mountains to Cooper Discoverer STT pros. I'm in fields and snow too much with my job for highway tires and the old tires are wore out now anyway.
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