2021 GMC Sierra 2500HD Tire Size & Pressure
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Quick answer
- OEM Tire Size: 275/70R17, 275/65R18, 275/60R20
- Recommended Cold Tire Pressure (Front/Rear): 60-70 PSI (refer to door placard for exact figures based on payload)
- Bolt Pattern: 8x180mm
- Wheel Size: 17x8", 18x8", 20x8.5"
- Load Index/Speed Rating: Load Range E (121/120S or similar)
- Spare Tire Size: Full-size spare, typically matching one of the OEM sizes (e.g., LT275/70R17)
- TPMS Frequency: 315 MHz
Tire sizes by trim
| Trim Level | Tire Size | Wheel Size |
|---|---|---|
| Sierra | 275/70R17 | 17x8" |
| SLE | 275/70R17 | 17x8" |
| SLT | 275/70R17 | 17x8" |
| 275/65R18 | 18x8" | |
| AT4 | 275/70R18 | 18x8" |
| Denali | 275/65R18 | 18x8" |
| 275/60R20 | 20x8.5" |
Note: Wheel offset for most OEM wheels is around +44mm. Always verify with your specific vehicle's specifications.
Recommended replacement tires
When it's time for new tires on your 2021 GMC Sierra 2500HD, consider these popular and reliable options, all designed to meet the demands of a heavy-duty truck:
- Michelin Defender LTX M/S (Premium Tier): A long-standing favorite for reliability, quiet ride, and excellent all-season traction. Expect superior tread life and comfort for a highway-focused all-terrain tire.
- BFGoodrich All-Terrain T/A KO2 (Premium Tier): An iconic choice for those who venture off-road or desire an aggressive look. Known for its durability, impressive off-road grip, and respectable on-road manners.
- Goodyear Wrangler Duratrac (Mid-Premium Tier): A popular hybrid option offering aggressive off-road performance with good on-road characteristics. Great for drivers who need strong traction in various conditions, including snow.
- Falken Wildpeak A/T3W (Mid Tier): An excellent value proposition, providing a good balance of off-road capability, all-season traction, and a comfortable ride. Often praised for its performance in wet and snowy conditions.
When to inflate to max load PSI
For a heavy-duty truck like the 2021 GMC Sierra 2500HD, understanding tire pressure is critical, especially when hauling or towing. The recommended cold tire pressure listed on your door placard is for typical driving conditions and maximum recommended payload. However, tires themselves have a "Max. Press." stamped on their sidewall.
Only inflate your tires to the maximum PSI indicated on the tire's sidewall when your truck is consistently operating at or near its maximum Gross Vehicle Weight Rating (GVWR) or Gross Combined Weight Rating (GCWR). This typically means a fully loaded bed, towing a heavy trailer, or both. Inflating to max load PSI ensures the tires can safely support the increased weight, prevents excessive sidewall flex, and maintains stability. For everyday driving with an empty truck, sticking to your door placard
More specs for the 2021 GMC Sierra 2500HD
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
2001 Sierra 2500HD
2002 Sierra 2500HD
2003 Sierra 2500HD
2004 Sierra 2500HD
2005 Sierra 2500HD
2006 Sierra 2500HD
Maintenance & repair guides
2021 GMC Sierra 2500HD Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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Values can vary by engine, trim and build date; check your VIN-specific service information. Updated 2026-06-22.