I know putting on bigger tires throws off the speedometer but does it affect anything else such as the odometer?

...but does it affect anything else such as the odometer?
Yes.
But it depends how big you are gonna go. If you are going from a 245/75 to a 265/75 there is only an inch difference in height. When talking about a 30 inch tall tire, 1 inch is only 3% difference and it may or may not effect your speedo or odo. I say this because many have posted that they checked their speed with a GPS and found that stock tires are not exactly "right-on" speedo or odo wise in the first place, and going to a slightly taller tire is actually closer to correct speed. Also, a loss of four or five lbs of air might be this much difference. If you go to 285's or taller you're probably gonna want to get a tuner to readjust the calibrations.
JP

Tuners work good if as long as you don't have a chip like the edge or the banks six gun, or if you don't mind stacking. But if you don't want to take that road there is another one http://www.superlift.com/accessories/truspeed.asp

ABS system is set based on the stock tires. If you increase the tire size you should make sure the ABS is corrected, even if you don't care about the speedometer.

How does one get the ABS recalibrated?

ABS can be recalibrated using a tech 2. My dealer did it for no charge. It takes about 2 minutes to do. With 30 seconds of that time trying to find the shop tech 2.

ABS can't be recalibrated on 05.( I was told ) Dealer said they can't do ABS or speedo anymore.

From another post: - - - - I added a tuner to my truck and my DIC mileage is off, why? All tuners will throw this reading off. The only way to get accurate mileage is to do a hand calculation. Divide how many miles you drove by how many gallons you added. Tire size effects it toooo. 265 on a 2500 give 4% more miles and 285 give 8% more miles IIRC. - - - -

Isn't this incorrect? Bigger tires will slow down the speedo and the odometer. I just put 285 BFG's on my '04 and have checked it by driving past those highway signs which say "your speed is XX" and i am only seeing maybe 2-3 mph difference, although only about 45 mph.

My 285s make for just about a 7% error. ABS is working just fine as is. Don't see what that has to do with it anyhow...:confused:

From another post: - - - - I added a tuner to my truck and my DIC mileage is off, why? All tuners will throw this reading off. The only way to get accurate mileage is to do a hand calculation. Divide how many miles you drove by how many gallons you added. Tire size effects it toooo. 265 on a 2500 give 4% more miles and 285 give 8% more miles IIRC. - - - -

Isn't this incorrect? Bigger tires will slow down the speedo and the odometer. I just put 285 BFG's on my '04 and have checked it by driving past those highway signs which say "your speed is XX" and i am only seeing maybe 2-3 mph difference, although only about 45 mph.

Those highway signs are never very accurate. You need a GPS unit if you want to be accurate. If you do the math or use a tire calculator you will see that your speedo is off by ~7%

My 285s make for just about a 7% error. ABS is working just fine as is. Don't see what that has to do with it anyhow...:confused:

I agree, why would ABS care what size tire your running???

IIRC the ABS works based on parameters of pressure on brake peddle and vehicle speed. If your going as much as 7% faster then what the speedometer shows, the ABS is not working as designed. Not a big deal at 10 mph but it can have a noticable effect at 60 or 70 mph on a hard brake situation.

Those highway signs are never very accurate. You need a GPS unit if you want to be accurate. If you do the math or use a tire calculator you will see that your speedo is off by ~7%

And 7% of 45 would be....??? 3 maybe?? :)

IIRC the ABS works based on parameters of pressure on brake peddle and vehicle speed. If your going as much as 7% faster then what the speedometer shows, the ABS is not working as designed. Not a big deal at 10 mph but it can have a noticable effect at 60 or 70 mph on a hard brake situation.

Am i correct in thinking that this 7% error will translate into 7% (+ the added rolling friction, of course) lost fuel mileage due to the odometer not counting as fast as it should?

Am i correct in thinking that this 7% error will translate into 7% (+ the added rolling friction, of course) lost fuel mileage due to the odometer not counting as fast as it should?

Yes you are correct. When I calculate my mileage (at every fill up since new) I multiply the miles x 1.07 then divide by gallons.

Yes you are correct. When I calculate my mileage (at every fill up since new) I multiply the miles x 1.07 then divide by gallons.

Cool. I will need to start doing that also. How about just adding 7% to the DIC mileage? Works out the same. Curious what mileage you are getting as we have identical stock trucks (well mine is a cc, yours is an ext cab) and tires (285 bfgs). With stock tires i averaged 16-18 with about 60% city driving. The bfgs dropped it about 2 mpg. I'm guessing it's ~1 mpg for the odometer being off and ~1 for the added rolling friction.

16-17 winter and 17-18 summer. 40% 60-65 mph, 45% 70-75 mph, 15% in town/local rural. I get around 14-15 doing some heavy farm equipment hauling at low speeds. Haven't done any high speed towing yet. I currently have about 25,000 on the OD. No real problems to speak of except the dreaded FICM wiring harness short and top of the steering box leaks. Haven't taken it to the dealer for that yet. Probably after the holidays.

So with bigger tires the odometer is actually showing less miles than what you have really driven?

So with bigger tires the odometer is actually showing less miles than what you have really driven?

Correct. Imagine something crazy like a 100 ft tall tire attached to the same rim as a normal tire. Then drive forward so that the wheel/tire assembly makes one rotation. The normal 245 tire might go a couple of linear feet, where the 100 ft tall tire might go well...lets see...c= pi*d = 314 ft. The wheel/rearend/transmission etc only made one rotation so the computer says it should put that towards the odometer but the truck actuall moved much farther. Same principle with 285s vs 245s, just on a much smaller scale...~7%.