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Oliver15

By Oliver15
in Modifications, Wheels & Tires

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Oliver15 Enthusiast

Oliver15

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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 . 

JimCost2014 Senior Enthusiast

JimCost2014

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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 Enthusiast

Oliver15

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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 Enthusiast

Oliver15

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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 Senior Enthusiast

JimCost2014

Posted
Posted
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 Enthusiast

Oliver15

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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 Enthusiast

Oliver15

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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 Senior Enthusiast

JimCost2014

Posted
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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 Enthusiast

Oliver15

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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 Senior Enthusiast

mafd2

Posted
Posted
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 Enthusiast

Oliver15

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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

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