GMC Tire Size Calculator
Look up factory OEM tire sizes for every GMC model and trim — Sierra 1500, Sierra HD, Yukon, Canyon, Acadia, Terrain, and Envoy — from 1992 to 2025. Compare sizes, calculate speedometer correction, and get gear ratio recommendations for lifted builds.
Quick Answer
The most common GMC Sierra 1500 tire size is 265/70R17 (31.6" OD) on SLE/Pro trims and 265/65R18 (31.6" OD) on SLT trims. The GMC Sierra 2500 HD uses LT275/70R18 on AT4 and SLT models. The GMC Canyon AT4X runs a factory 285/70R17 BFGoodrich KO2 (33.7" OD). The GMC Yukon Denali uses 275/50R22 (32.8" OD). Use the OEM Lookup tab above to find the exact size for your model, year, and trim in seconds.
| GMC Model | Years | Trim | OEM Tire Size | Outer Dia. | Wheels |
|---|---|---|---|---|---|
| Sierra 1500 Pro / SLE | 2019–2025 | Pro | 255/70R17 or 265/70R17 | 31.1–31.6" | 17" |
| Sierra 1500 SLT | 2019–2025 | SLT | 265/65R18 or 275/60R20 | 31.6" or 33.0" | 18–20" |
| Sierra 1500 AT4X | 2022–2025 | AT4X | 275/70R18 | 33.2" | 18" |
| Sierra 1500 Denali | 2019–2025 | Denali | 275/50R22 | 32.8" | 22" |
| Sierra 2500 HD AT4X | 2022–2025 | AT4X | 305/70R18 | 35.4" | 18" |
| Sierra 3500 HD DRW | 2020–2025 | Dually | 235/80R17 | 33.5" | 17" (8-lug) |
| Yukon Denali | 2021–2025 | Denali | 275/50R22 | 32.8" | 22" |
| Canyon AT4X | 2023–2025 | AT4X | 285/70R17 (BFG KO2) | 33.7" | 17" beadlock-capable |
| Acadia AT4 | 2017–2025 | AT4 | 255/65R17 | 32.0" | 17" |
| Terrain AT4 | 2018–2025 | AT4 | 225/65R17 | 29.5" | 17" |
Use the OEM Lookup tab below to find the exact size for your specific year and trim. The Size Compare tab calculates speedometer correction and gear ratio recommendations for any upgrade.
GMC Tire Size Comparison CalculatorAll GMC Models
Popular GMC Upgrades — Click to Load
GMC Tire Outer Diameter & Dimension Reference
Pre-calculated dimensions for the most common GMC OEM tire sizes, covering Sierra, Yukon, Canyon, Acadia, and Terrain. All values derived from ISO metric formulas.
| Tire Size | OD | Sec. Width | Sidewall | Circumf. | Rev/Mi | Load Range | Used On |
|---|---|---|---|---|---|---|---|
| 255/70R17 | 31.1" | 10.0" | 7.07" | 97.7" | 648 | SL | Sierra 1500 Pro OE |
| 265/70R17 | 31.6" | 10.4" | 7.28" | 99.2" | 639 | SL / E | Sierra SLE / Canyon AT4 OE |
| LT265/70R17 | 31.6" | 10.4" | 7.28" | 99.2" | 639 | E (80 PSI) | Sierra AT4 / HD OE |
| 265/65R18 | 31.6" | 10.4" | 6.78" | 99.2" | 639 | SL | Sierra SLT / Yukon SLE OE |
| LT275/65R18 | 32.1" | 10.8" | 7.01" | 100.8" | 629 | E (80 PSI) | Sierra AT4 / Yukon AT4 OE |
| 275/60R20 | 33.0" | 10.8" | 6.50" | 103.7" | 611 | SL | Sierra SLT 20" / Yukon SLT OE |
| 275/50R22 | 32.8" | 10.8" | 5.38" | 102.9" | 615 | SL | Sierra Denali / Yukon Denali OE |
| 275/70R18 | 33.2" | 10.8" | 7.57" | 104.4" | 607 | E (80 PSI) | Sierra 1500 AT4X / Sierra HD SLT OE |
| 305/70R18 | 35.4" | 12.0" | 8.39" | 111.1" | 571 | E (80 PSI) | Sierra 2500 HD AT4X OE |
| 235/80R17 | 33.5" | 9.3" | 7.26" | 105.2" | 602 | E (80 PSI) | Sierra 3500 HD DRW Dually |
| 285/70R17 | 33.7" | 11.2" | 7.78" | 105.8" | 599 | E (80 PSI) | Canyon AT4X (BFG KO2) OE |
| 255/65R17 | 32.0" | 10.0" | 6.52" | 100.5" | 631 | SL | Acadia AT4 OE |
| 235/55R20 | 29.2" | 9.3" | 5.07" | 91.6" | 692 | SL | Acadia Denali / Yukon SLE 20" OE |
| 225/65R17 | 29.5" | 8.9" | 5.75" | 92.5" | 685 | SL | Terrain AT4 OE |
OD values computed from nominal metric size code. Actual manufactured dimensions may vary ±1–2% by brand. Always verify against your door jamb sticker before purchasing.
How GMC Tire Sizes Are Calculated
Standard Metric Format (265/70R17) & LT Prefix
Metric Format (e.g. 265/70R17): Section Width = 265 mm = 265 ÷ 25.4 = 10.43 inches Sidewall Height = 265 mm × 0.70 = 185.5 mm ÷ 25.4 = 7.30 inches Outer Diameter = 17 + (2 × 7.30) = 31.60 inches Circumference = π × 31.60 = 99.27 inches Revolutions/Mile = 63,360 ÷ 99.27 = 638.5 rev/mi LT Prefix (e.g. LT275/65R18): LT = Light Truck construction (10-ply equiv., 80 PSI max for Load Range E) All dimension formulas identical — LT only affects load capacity & max pressure.
Gear Ratio Recalibration After Tire Lift
Gear Ratio Recalibration After Tire Lift: New Ratio = Stock Ratio × (New Tire OD ÷ Stock Tire OD) Example: Sierra 1500 AT4, 3.42 gears, going from 265/70R17 (31.6") → 315/70R17 (35.0") New Ratio = 3.42 × (35.0 ÷ 31.6) = 3.42 × 1.107 = 3.79 → Upgrade to 4.10 Rule of thumb: Any OD increase > 7% → re-gear strongly recommended. Sierra 1500 common upgrades: 3.42 → 4.10 (35s), 3.42 → 4.56 (37s) Sierra HD: 3.73 → 4.10 or 4.56 depending on tow weight.
Speedometer Correction
Speedometer Correction Formula: True Speed = Indicated Speed × (New Tire OD ÷ Stock Tire OD) Example at 60 mph indicated, stock 265/70R17 (31.6") → new 315/70R17 (35.0"): True Speed = 60 × (35.0 ÷ 31.6) = 60 × 1.107 = 66.4 mph ⚠ You are traveling 6.4 mph faster than your dash shows at every indicated 60 mph. Recalibrate via HP Tuners (MPVI3), EFI Live, DiabloSport, or GM dealer GDS2 reflash.
How to Use This GMC Tire Size Calculator
- 1Look up your GMC OEM tire size: Go to the OEM Lookup tab. Select your GMC model (Sierra, Yukon, Canyon, Acadia, Terrain, or Envoy), then choose your year range and trim level. The factory tire size(s) from the door placard will appear instantly. Click 'Use as Stock' to pre-fill the size compare calculator.
- 2Enter your stock and proposed new tire size: In the Size Compare tab, enter your current (stock) tire size and the new size you are considering. The format is Width/AspectRatioRRimDiameter — for example 265/70R17 or LT275/65R18. The LT prefix is optional.
- 3Enter your axle gear ratio (optional): If you plan to upgrade tire size for a lifted build, enter your current axle gear ratio. Common GMC Sierra ratios are 3.08, 3.42, and 3.73. Sierra HD and Canyon: 3.42 or 3.73. This unlocks the gear ratio recalibration recommendation.
- 4Click Calculate and review all results: The calculator instantly shows outer diameter change, width change, sidewall height change, ground clearance delta, full speedometer correction table at every speed from 25–80 mph, and — if you entered a gear ratio — the recommended new ratio.
- 5Use the Lift Guide for max tire size: Click the Lift Guide tab for the full lift-to-tire clearance matrix for Sierra, Canyon, and Yukon. Includes AT4 and AT4X factory off-road specs, wheel offset recommendations, and fender clearance notes.
- 6Check Re-Gear tab for powertrain-specific advice: After a tire upgrade, consult the Re-Gear tab for engine-specific gear ratio notes covering the 5.3L EcoTec3, 2.7T, 3.0L Duramax (LM2), 6.6L Gas (L8T), and 6.6L Duramax (L5P). Also includes speedometer recalibration options: HP Tuners, EFI Live, DiabloSport, and GM dealer reflash.
GMC Tire Rules — What Every Owner Should Know
🔧 LT vs. P-Metric on Sierra
All Sierra HD (2500/3500) trucks require LT-rated tires — P-metric is not suitable. For Sierra 1500, LT tires are required on AT4 and recommended if you regularly tow near GVWR. The Denali and SLT with stock 22" wheels use P-metric touring tires, which is fine for light towing. The moment you upgrade to a lifted off-road setup, switch to LT.
📐 AT4X Changes the Baseline
The Sierra 1500 AT4X ships from GM with 275/70R18 (33.2" OD) — a full 1.6" taller than the SLT 18" tire. If you own an AT4X, use that as your stock baseline in the Size Compare tab, not the base Sierra size. The Sierra 2500 HD AT4X ships with factory 35" tires (305/70R18, 35.4" OD) — there is almost no production HD truck that ships taller from the factory.
⚙️ L5P Duramax Re-Gear Caveat
The 6.6L Duramax L5P in the Sierra HD is uniquely tolerant of larger tires due to its 910 lb-ft of torque. Owners report 37" tires on stock 3.73 gears feel acceptable for most driving. However, towing near max capacity (14,500+ lbs) with oversized tires on stock gears significantly increases transmission temperature and wear. If you tow heavy regularly, re-gear regardless of engine.
🌡️ Cold PSI for GMC Trucks
Always set tire pressure when cold (parked 3+ hours). The door placard PSI is your target cold pressure. LT-rated Sierra tires at 80 PSI (LR-E) can rise to 90–95 PSI at operating temperature under load — this is normal. Never bleed air from hot tires to hit the cold target. The Yukon's 22" Denali tires run 35 PSI cold — significantly lower than Sierra work tires.
🔄 Canyon AT4X — Beadlock-Capable Wheels
The 2023–2025 Canyon AT4X ships with beadlock-capable wheels — they look like beadlocks but require aftermarket bead retainer rings ($40–60/wheel) to function as true beadlocks. This is a significant off-road advantage: true beadlocks allow you to air down to 8–12 PSI for maximum traction without risk of tire separation. The 285/70R17 KO2 is already an aggressive choice; airing down to 15 PSI improves off-road grip dramatically.
📏 Yukon 22" Owners — Tire Cost Warning
The 275/50R22 tires on the Yukon Denali and Sierra Denali are significantly more expensive than the 17–18" truck tires on lower trims. Expect $250–350 per tire for quality all-season replacements versus $150–200 for a 265/70R17. The 22" size also has fewer off-road and winter tire options. If you plan to run winter tires, consider a dedicated 17 or 18" steel wheel set for winter use — far cheaper and more tire selection.