Jump to content

Changing Wheel/Tire Size

bigman32hockey
 Share

Recommended Posts

bigman32hockey Enthusiast

bigman32hockey

Posted
Posted

I own a 2020 Silverado 2500 LTZ.  I have the optional chrome wheels on the truck and 275/65R20 tires.  A friend of mine recently purchased new wheels and tires for his 2020 Sierra 2500 AT4.  I've been wanting to put some black wheels on my truck for a while now.  He gave me the wheels and tires for my truck.  Can't beat THAT price!  I do have a couple of questions though.  First, will going from 275/65R20 tires to 275/70R18 cause me any major issues?  I've calculated the total diameter difference to be 0.9 inches.  Anyone know if the speedometer and/or odometer will be totally off because of this?  Secondly, does Chevrolet sells replacement plastic center caps that would fit a GMC wheel?  It's pretty blacked out, but I'd rather not have a GMC logo on a Chevy truck.  Just looks kinda weird in my opinion.  Any help is greatly appreciated.  Thanks. 

kylant Enthusiast

kylant

Posted
Posted (edited)

you are going to an inch smaller tire. the speedometer will read faster. 

on my truck, and others I have heard of, the speedometer calibration for the 275/65-20s is fast already. 

I put a 295/65-20 (1" taller) tire on my truck and now my speedometer is dead accurate with GPS and roadside radar.

 

as far as the cap, depends on the wheel. but i know gm makes black caps in both the GMC and Chevy flavors for certain wheels. I have seen guys swap caps and do exactly what you want to do

Edited by kylant
  • 6 months later...
Westy5 Enthusiast

Westy5

Posted
Posted

I swapped my stock 275/75r17 tires for new wheels and 295/70r18 tires,which are quite a bit bigger, on my new 2022 2500 hd . And at 75mph on the Speedo gps says I’m going 78 mph. I’d assume that the faster your going a little more it would be off

2329242A-2CA2-45CD-9E19-63D163D1A465.jpeg

Another JR Senior Enthusiast

Another JR

Posted
Posted

Using the mile markers of a marked 5 mile highway speedometer test section, my 2021 3500hd with stock Michelin 18s seems to be almost dead on accurate. At 5 miles the number flipped about 100 feet after the marker. That’s just under 1/2% error. 
 

I have not been able to find out if there is a different calibration on trucks delivered with 20 inch wheels. 

  • 9 months later...
goforit Enthusiast

goforit

Posted
Posted

Sorry to revive an old thread but I didn't find anything more recent and on topic.

 

I recently swapped my stock 17" LT wheels for a takeoff set of 20" LTZ wheels.  I purchased them from a place that deals in takeoff stock wheels for a variety of makes.  I had the TPMS programmed at the time, and I assumed I could have a dealer change/correct the tire size to another stock size, 2 dealers I called said they can't do this on the current generation trucks.

 

Since I installed the 20" set I have been using a gps speed app on my phone part of the time I am driving and some of the time the speed is correct and some of the time it is off nearly 10% which is what I expected, as in one day it might match the app dead on and the next day I am going 10% faster than it reads.  What is everyone doing to correct this or at least have it be consistent?

Another JR Senior Enthusiast

Another JR

Posted
Posted

I recall in another thread someone mentioned that there is a different software setting for the different optional tire sizes to make the speedometer accurate. You are going from one factory size to another factory size. I’d suggest asking the dealer if it is something they can reset for you for not too much money. 

goforit Enthusiast

goforit

Posted
Posted

I contacted 2 dealers today and both said that they can’t change the tire size even though I am trying to go from one stock size to another, so I was wondering if anyone had the same experience.   I can buy an aftermarket module to perform the calibration/adjustment, but I thought I had read that the dealer can change it to another stock size so I wanted to prevent adding hardware if possible.  

  • 8 months later...
Poopster Enthusiast

Poopster

Posted
Posted

I just changed my wheels and tires on my 2022 GMC AT4. I went from the OEM 20” wheels with Goodyear Territory MT LT265/60R20 to Toyo Open Country A/T III 35x12.5R17LT. The dealer said no can do for relearning the TPMS on a aftermarket tire. I purchased the tires & wheels from Custom Offsets, and they said the TPMS should relearn themselves after around 250 miles which hasn’t happened yet.

20230514_162857.jpg

20230525_150538.jpg

DuckBoi Enthusiast

DuckBoi

Posted
Posted
On 5/25/2023 at 2:36 PM, Poopster said:

I just changed my wheels and tires on my 2022 GMC AT4. I went from the OEM 20” wheels with Goodyear Territory MT LT265/60R20 to Toyo Open Country A/T III 35x12.5R17LT. The dealer said no can do for relearning the TPMS on a aftermarket tire. I purchased the tires & wheels from Custom Offsets, and they said the TPMS should relearn themselves after around 250 miles which hasn’t happened yet.

20230514_162857.jpg

20230525_150538.jpg

How do you like the toyo at3's?

Dr1ft3r Enthusiast

Dr1ft3r

Posted
Posted

Changing tire sizes is a common thing to do. I seen it in racing a lot. There are plenty of aftermarket shops that have the ability to correct your speedometer. It doesn't have to be done at the dealer. In fact, I think it's illegal for the factory to lock out the ability to have the speedometer calibrated since it's a Federal law that a speedometer must be accurate within 5 mph at a speed of 50 mph and there's no law preventing someone from changing their tire size.

If the dealers don't want to make some money for a simple adjustment, spend your money somewhere else.

  • 4 weeks later...
Poopster Enthusiast

Poopster

Posted
Posted
On 5/26/2023 at 9:08 PM, DuckBoi said:

How do you like the toyo at3's?

Best tires I've ever owned. I've had BFG, Goodyear, just to name a few.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,942
    Total Members
    8,960
    Most Online
    tblt44
    Newest Member
    tblt44
    Joined

  • Who's Online   6 Members, 0 Anonymous, 655 Guests (See full list)

  • Latest Articles

  • Posts

    • C/K Man
      Silverado 4500-5500-6500 are they still being produced? Would have sold better as GMCs as well

      By C/K Man · Posted

      There was talk over the last couple of years that the contract to build these trucks between GM and International would not be renewed.  International moved production of all their other trucks besides the companion CV model out of the Springfield plant some time ago when they opened their San Antonio plant.  That left Springfield only building the Silverado Medium Duty, International CV Series, and some Express/Savanna long wheelbase cutaways.  International also put the plant up for sale some time ago.  This all answered my earlier question as to why GM and International did nothing with these trucks since they were introduced, as they had basically become a market 'placeholder' with a finite life.    The Silverado Medium Duty/International CV trucks were interesting combination of a GM powertrain, electrical system, and K2XX Silverado cab with an International chassis that was supposedly designed for a step-van type vehicle they never produced.  They were manufactured in International's Springfield plant along with the IH MV series initially.  When first introduced, there was much talk that the Silverado Medium Duty/CV would eventually get a gasoline engine option along with other upgrades and GM and IH would work on a class 6/7 joint venture truck.  This was before VW bought Navistar out, after that happened no more was said.  Draw your own conclusions...   About the time talk started that the GM/IH joint venture was not going to be renewed, rumors started that GM would develop a new line of medium duty trucks themselves.  The story is the new trucks will be part of the next generation HD's due in 2028, and will still feature a 'straight rail' chassis design that the current medium duty has.  GM views this as a desirable feature that differentiates their truck from the competition.  A gasoline engine option is also expected.  As the current Silverado Medium Duty remains in production until September 2026 and there is still a lot of inventory available do not expect any official word for some time.   I believe GM remains committed to their successful partnership with Isuzu, and all the LCF models will still be available from Chevy Commercial dealers.  Isuzu is on the cusp of opening a new large plant in South Carolina and there is also speculation that this may result in new product for both Isuzu and Chevy Commercial dealers.                  
    • davester
      push to talk button

      By davester · Posted

      drive the truck back to the dealer and complain that the button works.
    • davester
      push to talk button

      By davester · Posted

      drive the truck back to the dealer and complain that the button works.
    • nfisherman
      Software Update

      By nfisherman · Posted

      I have a 2026 2500 HD Ultimate. My phone app says there’s a software update available. It’s something about improved battery management and something to do with the running boards. I follow the instructions for the update but the “Check for Updates” option is greyed out in my settings menu. Has anyone else seen this? How did you resolve it? The help message just says “see your dealer” if the download doesn’t work. I’m just trying to save a trip. 
    • newdude
      Exhaust Question

      By newdude · Posted

      Fuel mileage?  That's all how you use your right foot.  Exhaust will give you sound.   Stock exhaust 5.3 is 2.75" diameter piping.     If the truck is nice and worth putting some $$ into it, I'd go for a Corsa catback.  I had one on my 2019 old body 5.3 and it was just perfect.  Zero drone, just driving around and cruising on the highway you'd think it was stock, but when you opened it up it was like a Camaro with the factory dual mode.  Corsa bumps their catback to 3in diameter.  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...