GMC Sierra 1500 tires

The Sierra 1500 runs six recorded tire fitments, from a 17 inch work tire to a 22 inch Denali one, and the label that gives the right pressure for yours is on the B-pillar. Not the door jamb, which is where most people look first and find nothing.

The sizes GMC fitted

From the 2022 fitment list:

• 255/70R17 112S on Pro and SLE
• 265/65R18 114T on SLE and SLT
• 275/60R20 115S on SLE, Elevation, SLT, AT4 and Denali. This is the volume fitment.
• 275/50R22 111T on SLT, Denali and Denali Ultimate
• LT275/65R18 load range C 113/110Q on Pro with X31 Off-Road, AT4 and AT4X
• LT265/70R17 load range C 112/109Q on Pro and SLE, with LT265/60R20 load range C 110/107S also listed for AT4

One truck carries that many sizes because the wheel package, the trim and the off-road option all move it. The LT-metric tires on the off-road trucks are not interchangeable with the road tires of similar size. They carry more, sit on a stiffer casing and run at a different pressure.

The tires on the truck now may not be the ones the placard names. If someone fitted a different wheel package, the placard pressure becomes a starting point rather than the answer. Our guide to finding your tire size covers reading the sidewall.

Where the Sierra hides its tire label

The Tire and Loading Information label is attached to the centre pillar, which GM names in the manual as the B-pillar. That is the upright post between the front and rear doors. Open the driver's door, then look at the truck rather than at the door.

This is worth knowing because almost every general article about tire pressure tells you to check the driver's door jamb. That advice is right for a Toyota or a Honda and wrong for a GM truck. Chevrolet, GMC, Ram, Nissan, Subaru and Tesla all use the pillar.

One caveat we will state plainly: the manual we read is the shared Chevrolet and GMC Silverado 1500 book. A GMC-branded manual was not available to us, so the label location and the fitting details below come from the shared document rather than a Sierra-specific one. The trucks share the platform and the hardware.

Reading the label

It carries four things: cold pressure front, cold pressure rear, the original tire size and the spare. Cold means parked at least three hours or driven under a mile, because a rolling tire warms and its pressure climbs with it.

We do not publish a PSI figure for the Sierra. GM prints none in the manual, and we will not copy the Silverado's aggregated figures across on the assumption that a shared platform means a shared placard. Shared platform, different badge, different curb weight by trim. Read your own label. Our tire pressure placard guide explains why the lookup sites contradict each other on trucks.

Replacing fewer than four

GM asks for replacement in complete sets of four, uniform tread depth, new tires to the rear axle when only two are fitted, and a matched TPC Spec rather than just a matched size. GM publishes no numeric tread-depth tolerance for a four-wheel-drive Sierra. On a 4WD truck with three worn tires, the safe course is to match all four or to ask first. See how many tires and mixing tire brands.

On AT4, AT4X and X31 trucks, the load range and the TPC Spec matter as much as the size.

What changes on a mobile Sierra fitting

• The wheel nuts sit under caps that unscrew counter-clockwise with the wheel wrench, plus centre caps that sometimes need prying. They add time and they break.
• Power-assist running boards are disabled before anything goes under the truck. GM prints that as an injury warning, not a suggestion.
• Direct TPMS, one sensor per wheel reporting to a receiver in the truck. Sensors are transferred or replaced on a wheel swap and the telltale is checked afterwards.
• Wheels run 17 to 22 inches. The Denali Ultimate is 22 inch only, and 275/50R22 is a low-profile fitment with little sidewall to protect the rim.
• The full-size spare hangs under the rear on a cable hoist, so any spare work is an under-vehicle job and the cable tension gets re-checked before we leave.
• GM does not print a wheel nut torque figure in the tire sections we read. We take the torque from the manual in your truck rather than from memory.

What we do

We supply the tires and fit them where the truck is parked. Pressures are set to the label on your B-pillar, the TPMS is reset or relearned where the truck supports it, and the old tires leave with us. Pricing is on our mobile tire replacement page.

Questions people ask

• Where is the tire pressure label on a Sierra? On the B-pillar, the post between the doors. GM says centre pillar in the manual. It is not on the door edge.
• What PSI should a Sierra 1500 run? The figure on your own label. GM prints no number, and a 20 inch Denali and an AT4 on LT-metric tires are not close to each other.
• Are Sierra and Silverado tires the same? The sizes overlap heavily because it is the same platform, but confirm against your own truck rather than assuming.
• Can I fit road tires to an AT4? Not without a conversation. Those trucks run LT-metric load range C tires and the load range is part of the specification.
• Do I have to buy four? GM's manual asks for four. Where we fit two, they go on the rear axle.
• Will the pressure light clear? Yes, where the truck supports a roadside reset or relearn. We check the telltale before leaving.