2025 GMC Sierra 2500 HD AT4X (Inflation Option) — LT305/70R18
2025 GMC Sierra 2500 HD AT4X (Inflation Option)
- Factory size
- LT305/70R18
- Load / speed
- 126/123R
0 tire results
Factory-size matches for your vehicleNo tires are priced for this selected size and service class.
Choose yours for its prices, shelf stock and open times.
What size tires does the 2025 GMC Sierra 2500 HD AT4X (Inflation Option) take?
The factory tire size for the 2025 GMC Sierra 2500 HD AT4X (Inflation Option) is LT305/70R18.
The catalog lists it at load index 126/123, speed rating R (up to 106 mph).
| Wheels | Size | Load index | Speed rating |
|---|---|---|---|
| All wheels | LT305/70R18 | 126/123 | R |
Confirm the size printed on the sidewall of your current tire or on the tire placard in the driver's door jamb before you buy. Replacement tires should meet or exceed the vehicle's load index and speed rating.