GMC · Sierra · Rear
Rear axle PSI and bar on the GMC Sierra
- Drivetrain
- rear-wheel drive
- Body
- pickup / double-cab
- PSI F / R
- 32-35 / 32-35
- Bar F / R
- 2.2-2.4 / 2.2-2.4
psi rear
34
2.31 bar · 231 kPa at the rear axle
32-35 psi F · 32-35 psi R · 2.2-2.4 / 2.2-2.4 bar · 231/231 kPa
The rear of a pickup / double-cab takes passengers, luggage and, on vans, payload. Catalogue rear pressure on the GMC Sierra is 32-35 psi / 2.2-2.4 bar. Size estimates on this page include LT265/70R17, 275/65R18 and 285/70R17 — interpolated from the catalogue midpoint, not a second factory sticker. Commercial and load-biased bodies like this pickup / double-cab often need a higher rear; LT or C-type sizes such as 285/70R17 are not filled like a Fiesta.
GMC Sierra placard versus sidewall
The tyre-information placard on a GMC Sierra sits on the driver’s door pillar (sometimes the fuel-filler flap). Catalogue figures here are a general band: 32-35 / 32-35 psi.
Estimated pressure by tyre size (LT265/70R17 and others)
If your GMC Sierra no longer wears the OEM diameter, start at the row nearest LT265/70R17 or 275/65R18 and confirm with the tyre maker’s load table.
| Tyre size | Front PSI | Rear PSI | Front bar | Rear bar | Front kPa | Rear kPa | Note |
|---|---|---|---|---|---|---|---|
| LT265/70R17 | — | 48 | — | 3.31 | — | 331 | LT 17-inch |
| 275/65R18 | — | 40 | — | 2.76 | — | 276 | Plus-size 18-inch |
| 285/70R17 | — | 41 | — | 2.83 | — | 283 | Wide all-terrain |
| 265/70R17 | — | 39 | — | 2.69 | — | 269 | Typical 17-inch load tyre |
| LT245/75R16 | — | 46 | — | 3.17 | — | 317 | LT-metric, higher load |
| 245/70R16 | — | 38 | — | 2.62 | — | 262 | Common 16-inch all-terrain |
| 235/75R15 | — | 37 | — | 2.55 | — | 255 | Older compact truck |
| 255/65R17 | — | 39 | — | 2.69 | — | 269 | Highway 17-inch |
Pressure against load
Load moves the rear of a pickup / double-cab first. If the factory placard already has a “laden” column, use that instead of these sketches.
| Condition | Front (est.) | Rear (est.) |
|---|---|---|
| Driver only | 34 psi / 2.34 bar | 34 psi / 2.34 bar |
| Full occupancy | 34 psi / 2.34 bar | 35 psi / 2.41 bar |
| Payload / towing | 35 psi / 2.41 bar | 36 psi / 2.48 bar |
A family pickup / double-cab with a boot full of luggage should use the laden rear figure if Ford, VW or Mercedes printed one. Otherwise the modest steps in the load table are only a sketch for this Sierra.
How to set the Sierra
- Measure before the school run, not after the M25.
- Write LF / RF / RR / RL. Do not keep Sierra numbers in your head.
- Add air in short bursts toward 34 psi (2.31 bar) front and 34 psi rear.
- If one corner is 4 psi down, hunt for a nail before you blame the weather.
- Log date, ambient temperature and the four readings.
PSI, bar and kPa
PSI-led conversions for the GMC Sierra band (32-35 / 32-35).
| PSI | Bar | kPa |
|---|---|---|
| 30 | 2.07 | 207 |
| 32 | 2.21 | 221 |
| 33 | 2.28 | 228 |
| 33.5 | 2.31 | 231 |
| 35 | 2.41 | 241 |
| 36 | 2.48 | 248 |
| 38 | 2.62 | 262 |
| 40 | 2.76 | 276 |
| 44 | 3.03 | 303 |
| 50 | 3.45 | 345 |
| 60 | 4.14 | 414 |
Temperature drift
Roughly 1 psi per 5–6 °C. The table uses 34 psi as a 20 °C baseline for this Sierra.
| Ambient | Gauge (front mid) | Bar | kPa | Note |
|---|---|---|---|---|
| −5 °C (hard frost) | 31 psi | 2.14 bar | 214 kPa | Gauge reads low; do not overfill once warm |
| 0 °C | 32 psi | 2.21 bar | 221 kPa | Gauge reads low; do not overfill once warm |
| 8 °C (UK winter morning) | 33 psi | 2.28 bar | 228 kPa | Gauge reads low; do not overfill once warm |
| 20 °C (set cold here) | 34 psi | 2.34 bar | 234 kPa | Baseline |
| 30 °C | 36 psi | 2.48 bar | 248 kPa | Do not bleed a hot tyre |
| 38 °C (heatwave tarmac) | 37 psi | 2.55 bar | 255 kPa | Do not bleed a hot tyre |
GMC notes
No special GMC exception: the Sierra uses the door-pillar placard. Size estimates on this page only help if you have left the original load index behind.
Spare and inflator kit
A matching full-size spare on the GMC Sierra usually follows the higher axle (often the rear, near 32-35 psi). A space-saver is commonly 60 psi / 4.1 bar — read that tyre’s own sidewall. An inflator kit is not a spare; check the sealant date.
If the GMC sticker and this page disagree, the sticker wins.
Other GMC models
Questions about this Sierra
What is that in bar and kPa for the Sierra?
Mid-points are about 2.31 bar (231 kPa) front and 2.31 bar (231 kPa) rear.
Should I bleed pressure after a motorway run?
No. Heat raises the gauge. Set cold only. Bleeding a hot tyre leaves it low the next morning.
How often should I check a Sierra?
Monthly, before a long trip, and after a 10 °C weather swing. Include a full-size spare.
Is the sidewall number correct on a GMC Sierra?
No. Sidewall PSI is a maximum. The Sierra placard is the operating target, near 32-35/32-35 psi.
What tyre pressure should a GMC Sierra use?
Catalogue reference is 32-35 psi front and 32-35 psi rear (2.2-2.4 / 2.2-2.4 bar), cold. Confirm on the door-pillar placard.
Handbook: placard · bar vs PSI · front vs rear · cold inflation