Wheels and tires

[Oliver15]

Evening all ,

Just picked up my 2020 2500 Duramax W/T and I’ve gotta get rid of the stock 17’’ wheels . Looking at 18 inch with 285/65-18 . I can’t get a straight answer from anyone if this will cause transmissions or Speedo issues ? Also clearance . 

[mafd2]

You may get better results in the 2500 section.

Edited September 2, 2020 by mafd2

[Oliver15]

Rookie move ! I thought I was in the 2500 section . 

[CamGTP]

Plug you tire size information into here and you will have the answer to your question.

 

https://tiresize.com/calculator/

 

People change tire sizes all the time without doing anything to the computer.

[JimCost2014]

53 minutes ago, Oliver15 said:

Evening all ,

Just picked up my 2020 2500 Duramax W/T and I’ve gotta get rid of the stock 17’’ wheels . Looking at 18 inch with 285/65-18 . I can’t get a straight answer from anyone if this will cause transmissions or Speedo issues ? Also clearance . 

Welcome to the site.

 

285 65 18 = 32.59 for diameter, with a 7.29 sidewall.

 

What size are your current 17's?

[Oliver15]

Thanks ! 245/75-17

[Oliver15]

26 minutes ago, CamGTP said:

Plug you tire size information into here and you will have the answer to your question.

 

https://tiresize.com/calculator/

 

People change tire sizes all the time without doing anything to the computer.

Thanks! I was just looking at that actually. I didn’t want my tires sticking outside the body so determine offset will be next . I believe stock is 44mm

[Oliver15]

Just now, Oliver15 said:

Thanks! I was just looking at that actually. I didn’t want my tires sticking outside the body so determine offset will be next . I believe stock is 44mm

 

14 minutes ago, JimCost2014 said:

Welcome to the site.

 

 

285 65 18 = 32.59 for diameter, with a 7.29 sidewall.

 

What size are your current 17's?

245/75-17 sir 

[JimCost2014]

9 minutes ago, Oliver15 said:

Thanks ! 245/75-17

You are very welcome.

 

245 75 17 = 31.47 diameter, with a 7.23 sidewall.

 

265 65 18  puts you at 31.56 diameter, and a 6.78 sidewall.

[Oliver15]

14 minutes ago, JimCost2014 said:

You are very welcome.

 

245 75 17 = 31.47 diameter, with a 7.23 sidewall.

 

265 65 18  puts you at 31.56 diameter, and a 6.78 sidewall.

New tire will be 285/65-18 .

[Oliver15]

2 minutes ago, Oliver15 said:

New tire will be 285/65-18 .

Now I’m establishing a good offset . I wanna bring the tires out just a tad . The stock 17s sit in a bit making the stance awful .

[JimCost2014]

1 hour ago, Oliver15 said:

New tire will be 285/65-18 .

Dealer should be able to calibrate speedo, no idea on if the tires will rub, I am out of information. 

[Oliver15]

Spoke with my dealer this morning and they can reprogram for any size that was an option from factory. So I’ll be goin gin with 20 inch wheels I believe. Thanks for all the help . 

[mafd2]

1 hour ago, Oliver15 said:

Spoke with my dealer this morning and they can reprogram for any size that was an option from factory. So I’ll be goin gin with 20 inch wheels I believe. Thanks for all the help . 

It's not just the wheel size but the tire size option.  It has to be an o.d. tire size that was an option on that vehicle and not just a 20" wheel with a big tire that wouldn't have come on that truck. You're not calibrating the wheel to speedo but overall diamater of the tire to speedo. 

[Oliver15]

20 minutes ago, mafd2 said:

It's not just the wheel size but the tire size option.  It has to be an o.d. tire size that was an option on that vehicle and not just a 20" wheel with a big tire that wouldn't have come on that truck. You're not calibrating the wheel to speedo but overall diamater of the tire to speedo. 

Yes . I’m choosing a stock tire option as well. 275/65-20