Chevy pickup tires

Ultradog MN · Jul 27, 2023

Need new tires on my 2013 K2500 HD.
My rims are getting rusty so I was going to
sandblast/prime/paint them before putting the
new tires on.
But I found a set of 4 new take-off
rims/tires from a 2023 Chev for sale which
would solve both the tires and rust.
Both pickups use the new 8-180mm lug pattern.
My question is about tire size.
My 2013 has LT265/70 R17
The 2023 has LT275/70 R18
I found a tire chart that lets you compare
dimensions.
Screen cap of that below.
Please check my math but I think using the
18s would have me running 68 mph when the
speedometer shows 65 mph.
Is that a big deal?
Price is right on the 18s.
Would you do it?
Thanks

r.w.b. · Jul 27, 2023

seems low. id think much faster. loose pulling power

caterpillar guy · Jul 27, 2023

I'd do it just for the price of tires. It's not that hard to set the cruse for that difference. I set the cruse on the semi all the time just going the 20 miles to the elevator and back. I have to use the tach for the speed since I changed the speedometer head and can't seem to get it to calibrate right for the tires whether new or old. Measured the distance and used the chart aced it with the pickup and even called the company the speedo was made by to see about it. 1150 in 18th is set right at 60 MPH 1500 is 75MPH.

Sprint 6 · Jul 27, 2023

I would do it. It's the best way to get new tires at a fraction of the price. Most factory gm truck tires are about the same height, regardless of rim size. They do that to minimize needed speedometer calibrations. Those tire charts are listing what would be correct, if tires always ran perfectly round and were all exact size. That is never the case. You'll probably not notice a difference in actual use. 3mph is about the margin of error on a civilian speedometer.

The one warning I have, those 2023 tires will not run much mileage. I don't know your truck specs or usage, but my farm customers with Duramax HDs that really work them only get about 30K miles out of the original tires on these late model trucks. The diesel torque eats them off the rear.

timcasbolt · Jul 27, 2023

A plug-in gps will give you mph to the tenth.

BarnyardEngineering · Jul 27, 2023

My 2003 Chevy read 3MPH slow on the speedometer the entire time I owned it. With stock tires. I owned it 12 years. It was not a big deal.

You will not notice any difference in performance. Most likely the 2023 truck that those tires came off of has oversize tires now and the owner is happy is a clam.

Michael Soldan · Jul 27, 2023

You should gain MPG with the bigger tires.

DoubleO7 · Jul 27, 2023

(reply to post at 05:47:21 07/27/23)

You might ask your dealer or a independent shop that tunes because maybe they can recalibrate the speedo to match those new tires.

Electronically

ss55 · Jul 27, 2023

GPS shows that my vehicles all run a little slower than what the speedometer says. A 5 percent increase over stock tire size has not been a problem for me.

If you want to be certain, post your question on a Chevy truck forum, or scan/google those forums for similar questions. There is probably a guideline for the tallest and widest tire that your truck can safely run with the stock suspension.

Hobo,NC · Jul 27, 2023

Fitment Guide FOR YOUR TRUCK

Vehicle Make Vehicle Model Vehicle Year Vehicle Option

Chevrolet Trucks

Silverado 2500 HD

2013

LT Reg. Cab
Options
Option Tire Size Load Index Speed Rating Front Inflation Rear Inflation Notes Rim Size RIM
Click to sort by Load Index
Option Tire Size Load Index Speed Rating Front Inflation Front Rear Inflat Front Rear Inflation

LT Reg. Cab LT245/75R17 E 121/118R 121 R 50 80 7.5J 17

LT Reg. Cab LT265/70R17 E 121/118Q 121 Q 50 80 7.5J 17

LT Reg. Cab LT265/70R18 E 124/121S 124 S 50 80 8J 18

LT Reg. Cab LT265/70R18 E 124/121R 124 R 50 80 8J 18

Tires Compared
View Tire Size Indicitive OD Section Width
Start 275/70R17 32.2 10.8
New 275/65R18 32.1 10.8
Percentage Variation in ODs = -0.2

I think you will be OK

Russ from MN · Jul 27, 2023

I think they will work fine, depending on what you have for gear ratio, but it's not that much difference. It could make you mpg a little better, but the increase in width will hurt. We bought a new Silverado in 13, it still has the original tires on it at 75,000 miles. We sold it to our son last fall, and I have encouraged him to put new tires on it before this winter. He's in Montana on a fishing trip with it now.

NDIHC · Jul 27, 2023

The best tire size conversion chart I've found is at Tacoma World.com. Do a search of Tacoma world tire calculator. It gives dimensions, revs per mile, comparison between 2 tire sizes etc. Very helpful site. You punch in your 2 tire sizes and it does all of the work for you.

4play · Jul 27, 2023

Depending on how accurate your speedo is, you should be going about 68mph when 65mph is indicated, the 3mph discrepancy slightly lowers at slower speeda, and slightly increases at higher speeds. The speedo can be re-calibrated but it requires a scanner with programming functions, or a capable performance tuner.

Check Break · Jul 27, 2023

You might want to check the weight rating on the 18-s. They should have a lower max weight capacity than 17-s and 17-s lower than 16-s. Something I ran into shopping for tires for my F350.

Ultradog MN · Jul 28, 2023

Wow.
Thanks to all for the replys.
I got an email from him this morning.
He sold them.
Waaah

DoubleO7 · Jul 28, 2023

(reply to post at 11:34:45 07/28/23)

Down here in Florida at our chevy dealer, he sells brand new pickups already customized with aftermarket stuff including wheels and tires.

So he has a selection of brand new takeoffs at very reasonable prices.

Chevy pickup tires

Ultradog MN

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r.w.b.

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caterpillar guy

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Sprint 6

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timcasbolt

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BarnyardEngineering

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Michael Soldan

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DoubleO7

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ss55

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Hobo,NC

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Russ from MN

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NDIHC

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4play

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Check Break

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Ultradog MN

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DoubleO7

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