2024 GMC Hummer EV — SUV
The 2024 GMC Hummer EV SUV shipped with 2 different factory tire sizes, depending on the wheel package it left the factory with (this can also reflect a staggered front/rear setup). Check your tire sidewall or door placard to confirm which one applies to your vehicle.
This trim shipped with more than one tire size (staggered fitment, front/rear, or optional wheel package). Confirm which one matches your vehicle by checking your tire sidewall or door placard.
305/70R18
| Section width | 305 mm |
|---|---|
| Aspect ratio (sidewall height) | 70% (213.5 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~34.8" |
| Revolutions per mile | ~579 |
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305/55R22
| Section width | 305 mm |
|---|---|
| Aspect ratio (sidewall height) | 55% (167.8 mm) |
| Rim diameter | 22" |
| Overall tire diameter | ~35.2" |
| Revolutions per mile | ~573 |
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What this size means for your GMC Hummer EV
On the 2024 GMC Hummer EV SUV, the factory 305/70R18 measures about 34.8″ in overall diameter with a 213.5 mm (8.4″) sidewall, and completes roughly 579 revolutions per mile. Its 70-series aspect ratio gives a tall sidewall of the kind used on trucks, SUVs, and older passenger cars, built for cushioning and load. In tire terms it is a passenger (P-metric / Euro-metric) size.
The 305/70R18 and 305/55R22 differ by about 0.4″ (1.1%) in overall diameter; a gap this size is enough to affect speedometer and odometer readings, so confirm which one your vehicle actually left the factory with.
Other 2024 GMC Hummer EV trims
- Pickup 305/70R18 / 305/55R22
GMC Hummer EV tire sizes by year
- 2026 GMC Hummer EV 305/70R18 / 305/55R22
- 2025 GMC Hummer EV 305/70R18 / 305/55R22
How to read a tire size
A tire size like 225/45R17 breaks down into three parts:
the first number is the section width in millimeters
(the tire's width from sidewall to sidewall), the second is the
aspect ratio — the sidewall's height as a percentage of
that width — and the number after the "R" is the rim
diameter in inches. A letter prefix (P or LT) indicates
Passenger or Light Truck construction; its absence usually means
Euro-metric sizing.
Some trucks and off-road tires instead use "flotation" sizing, like
37X12.50R17 — here the numbers are the tire's overall
diameter and width in inches directly, with the rim diameter last.
Always verify against the tire information placard on your driver's-side door jamb or your owner's manual before purchasing — tire size can vary by factory option package even within the same trim.