wanted to put 265 tires on, dealer said warranty can be denied as odometer is not accurate which is fraud and can result in warranty denial.wtf, is this true.:mad:

Just find a new dealer. Sounds as if they are going to be sticky about it. I have 285's on mine and the dealer does not care.

LOL, I'm with GMC2500HD. Find a new dealer, now!

If they relly wanted to nit pick they could try. But they'll have a big problem with it in court considering that a 265/75/16 is a factory option on many of the 3500 and 1500 series trucks. Not to sure about the 2500 series though, but it is still a factory used tire. And the odometer difference would be slight at the most.

someone reported that odometer was off by about 10% so at 36,000 mile on odo was actually 33-34,000 miles, so whos ripping off who. with what thefermanator said and ive seen on trucks can they verify they were not installed at factory. best to just find dealer that not trying to shake you down.

My hometown dealer will put the tires on and recalibrate for you, sounds like they dont want to sell many more trucks!!!!

I bought my truck used from a Chevy dealer. He mounted 285's on the truck before putting it up for sale.

I purchased mine thru one of the largest dealers (they publish that they are the largest) and had to sign a declaration that I was made aware that increased tire size could result in warranty denial.

Keith ~ You'll need to add to the amount displayed on the odometer, not subtract.

265 tires will not affect trans. 285's and up will.

HOW DO YOU KNOW?:funnypost

265 tires will not affect trans. 285's and up will.

Of course they will. Just not as much. I have 265's on my 2500HD and 285's on the Suburban. I had both speedo's recalibrated easily.

I bought my truck used from a Chevy dealer. He mounted 285's on the truck before putting it up for sale.
Yep, same here. No problems at all...Id keep looking..

Of course they will. Just not as much. I have 265's on my 2500HD and 285's on the Suburban. I had both speedo's recalibrated easily.


I have a GPS system in my truck that gives me GPS speed display on the unit. I have 265s and when my speedometer says exactly 70, the GPS says I am going 75mph. So there is a huge difference in that. On a 10 mile trip to the store it is no big deal, but after 50,000 miles you are looking at 5,000 miles difference. That is Huge!!! I did not have my speedo recalibrated because I run Michelin LTX m/s 265s in the summer and then I switch back to BFG AT KO 245s in the winter.
The LTXs are a much better tire for summer temps, I was burning the BFGs off every 20,000 in summer miles, they are way too soft a compuind mixed with the weight of the truck for summer. The LTXs are great in the summer and can easily get 50,000 miles in summer months per set.

These are things to think about. I have yet to find a tire that would year round perform to the miles that the manuf. states, plus I have not found any dealer to prorate for the lack of mileage covered.

I have a GPS system in my truck that gives me GPS speed display on the unit. I have 265s and when my speedometer says exactly 70, the GPS says I am going 75mph. So there is a huge difference in that. On a 10 mile trip to the store it is no big deal, but after 50,000 miles you are looking at 5,000 miles difference. That is Huge!!! I did not have my speedo recalibrated because I run Michelin LTX m/s 265s in the summer and then I switch back to BFG AT KO 245s in the winter.
The LTXs are a much better tire for summer temps, I was burning the BFGs off every 20,000 in summer miles, they are way too soft a compuind mixed with the weight of the truck for summer. The LTXs are great in the summer and can easily get 50,000 miles in summer months per set.

These are things to think about. I have yet to find a tire that would year round perform to the miles that the manuf. states, plus I have not found any dealer to prorate for the lack of mileage covered.
If you are getting a difference of between 7 & 10%, it is not all due to the tires. Your speedo is off to begin with. The stock 245/75 16 tires are 30.469" tall, the 265/75 16 tires are 31.65" tall. This is a difference of 1.181", or 3.9% of stock tire height.
Note:
Tire height in inches = [(width X ratio X 2)/25.4] + wheel height

If you are getting a difference of between 7 & 10%, it is not all due to the tires. Your speedo is off to begin with. The stock 245/75 16 tires are 30.469" tall, the 265/75 16 tires are 31.65" tall. This is a difference of 1.181", or 3.9% of stock tire height.
Note:
Tire height in inches = [(width X ratio X 2)/25.4] + wheel height

I'm certainly not an expert on tire issues, but what does tire height have to do with speedo differences? Circumfrence should be the defining characteristic-which would be tire height X Pi (3.14...).

Tire heighth is part of the formula for circumference. I know my uncle has a 1500 and a new 3500 and they both came off the dealer lot brand new with 265/75/16 tires on them. They are both gas powered, but the door sticker even calls for the 265/75/16 tires.

Since the height of the tire is multiplied by pi(3.14) in both cases, you get the same result. I was just too lazy to do the extra calculation.The difference is still 3.9%.

I purchased used 01 3500 dually 2yrs. ago. the truck had 255/70x22.5 on alcoa,s. I picked the truck up in Orlando Fl. and drove back to Ma. on 2 tanks of fuel. The speedo is way off so I run a gps. I get around 18 hwy. empty. I've benn hauling a goose neck horse trailer since I got the truck. The truck has more power than it needs, no ill affects and I just had the truck to a dealer for a fuel pressure sensor. They did not question the tire size, they even replaced the injectors,fuel sensor,oil and filter and other items that might be a problem in the future. All for $100.00. I couldn't be happier w/ Beard Chevrolet in Hyanis Ma. By the way 2001 3500 silverado xtra cab all black w/ the tire and rim combo is the best looking truck on the road.

You may want to look at this site.

Great for comparing tire sizes, and speedometer differences.

http://www.discountpartcenter.com/tirecalc.html