Tire Size Specification
Verified OEM & Service Reference2020 GMC Sierra 6.2L EcoTec3 V8 (L87) — Tire Size
Recommended interval: Rotate every 5,000–7,500 miles; check cold PSI monthly
Engine / Trim Variant
Factory Tire Size
255/70R17 / 265/70R17 / 265/65R18 / 275/60R20
Quick Purchase
Check verified fitment on Amazon
Technical Specifications
| Front Tire Size | 255/70R17 / 265/70R17 / 265/65R18 / 275/60R20 |
|---|---|
| Rear Tire Size | 255/70R17 / 265/70R17 / 265/65R18 / 275/60R20 |
| Rim / Wheel Size | 17" |
| Lug Nut Torque | 140 ft-lb (190 Nm) |
| Matched Trims | 1500 2wd Crew Cab, 1500 2wd Double Cab, 1500 2wd Reguar Cab |
Compatible Aftermarket Options
Direct OEM cross-references- Buy Michelin / Continental / Pirelli 255/70R17 on AmazonMichelin / Continental / Pirelli255/70R17
Search query: 255/70R17 tire
Tire Size Fitment by Engine / Trim (2020 GMC Sierra)
| Engine / Trim | Oil Spec & Capacity | OEM Oil Filter |
|---|---|---|
| 5.3L EcoTec3 V8 | 0W-20 • 8.0 qt (7.6L) | 12706595 (PF63) |
| 6.2L EcoTec3 V8 | 0W-20 • 8.0 qt (7.6L) | 12706595 (PF63) |
| 3.0L Duramax Turbo-Diesel | 0W-20 • 7.0 qt (6.6L) | 55495105 (PF66) |
DIY Fitment & Verification Checklist for 2020 GMC Sierra
- Confirm your engine code or trim variant above before ordering parts, as mid-year production changes can affect tire size fitment.
- When purchasing OEM or aftermarket brands (Motorcraft, ACDelco, Mopar, Wix, Fram, Mobil 1, Bosch, NGK), cross-check the Amazon Garage Confirmed Fit badge with your 17-digit VIN.
- Always consult your 2020 GMC Sierra owner's manual for exact torque specs and fluid service intervals.
Sources: NHTSA vPIC & OEM Service SpecificationsReport an inaccurate spec or part number
Frequently Asked Questions
What is the OEM tire size specification for a 2020 GMC Sierra?
The primary OEM tire size part number / specification for the 2020 GMC Sierra 6.2L EcoTec3 V8 (L87) is 255/70R17 / 265/70R17 / 265/65R18 / 275/60R20.
Which aftermarket tire size brands fit the 2020 GMC Sierra?
Compatible aftermarket options include Michelin / Continental / Pirelli 255/70R17.