2020 GMC Sierra 1500 Crew Cab Bolt Pattern
Checking fitment for your vehicle? Below you will find the factory bolt pattern (also known as the lug pattern) for the 2020 GMC Sierra 1500 Crew Cab, along with offset and center bore data.
| Bolt Pattern (Lug Pattern) | 6x139.7 (6x5.5") |
|---|---|
| Lug Nut / Bolt Size | 14x1.5 |
| Center Bore (CB) | 78.1 mm |
| Offset (ET) | 20-30 |
| Torque Specs | 100 ft-lbs (135 Nm) |
Imperial Match: 6x139.7 is commonly referred to as 6x5.5" in US Standard.
2020 Sierra 1500 Crew Cab — Year-Specific Fitment Context
The 2020 GMC Sierra 1500 Crew Cab is in year 17 of 21 using the 6x139.7 pattern (2004–2024). Wheels from any 2004–2024 GMC Sierra 1500 Crew Cab are cross-compatible with the 2020 model.
GMC Sierra 1500 Crew Cab Bolt Pattern by Year
The table below shows how the Sierra 1500 Crew Cab's wheel specifications have changed over the years. The 2020 model year is highlighted.
| Year | Bolt Pattern | Center Bore | Offset |
|---|---|---|---|
| 2004 | 6x139.7 | 78.1 | 20-30 |
| 2005 | 6x139.7 | 78.1 | 20-30 |
| 2006 | 6x139.7 | 78.1 | 20-30 |
| 2007 | 6x139.7 | 78.1 | 20-30 |
| 2008 | 6x139.7 | 78.1 | 20-30 |
| 2009 | 6x139.7 | 78.1 | 20-30 |
| 2010 | 6x139.7 | 78.1 | 20-30 |
| 2011 | 6x139.7 | 78.1 | 20-30 |
| 2012 | 6x139.7 | 78.1 | 20-30 |
| 2013 | 6x139.7 | 78.1 | 20-30 |
| 2014 | 6x139.7 | 78.1 | 20-30 |
| 2015 | 6x139.7 | 78.1 | 20-30 |
| 2016 | 6x139.7 | 78.1 | 20-30 |
| 2017 | 6x139.7 | 78.1 | 20-30 |
| 2018 | 6x139.7 | 78.1 | 20-30 |
| 2019 | 6x139.7 | 78.1 | 20-30 |
| ▸ 2020 | 6x139.7 | 78.1 | 20-30 |
| 2021 | 6x139.7 | 78.1 | 20-30 |
| 2022 | 6x139.7 | 78.1 | 20-30 |
| 2023 | 6x139.7 | 78.1 | 20-30 |
| 2024 | 6x139.7 | 78.1 | 20-30 |
6x139.7 Pattern Context
This bolt pattern appears on 1067 vehicles in our current database and is considered common.
Examples of other vehicles using 6x139.7:
Expert Buying Guide for 2020 GMC Sierra 1500 Crew Cab
For your 2020 GMC Sierra 1500 Crew Cab, the 6x139.7 bolt pattern is shared across 2004–2024 models, ensuring broad cross-compatibility. Critical fitment factors: the 78.1mm center bore requires hub-centric rings for aftermarket wheels to prevent vibration and hub damage. Offset must stay within 20–30mm to avoid rubbing or suspension interference. Always use 14x1.5 lug nuts with the correct seat type—factory wheels use cone seats, while aftermarket may require ball or conical. Verify thread engagement and torque to spec. Never reuse damaged nuts; re-torque after 50–100 miles.
Historical Fitment Data Reference
In our dataset, GMC Sierra 1500 Crew Cab appears from 2004 to 2024 (21 model years). Across recorded model years, this model generally keeps the same bolt pattern.
- Observed bolt-pattern variants for this model: 1
- Observed center-bore variants for this model: 1
- Observed lug-size variants for this model: 1
- Observed total offset span across years: 50.0 mm
Quick Tips & Safety Warnings
- ✅ Re-torque lug nuts to 140 ft-lb after 50–100 miles of driving.
- ✅ Avoid wheels with offset below 20mm to prevent tire rubbing on fenders.
- ✅ Use hub-centric rings (78.1mm ID to 72.6mm OD for common aftermarket) to ensure proper centering.
- ⚠️ This fitment uses a wide offset range. Check brake clearance and fender clearance before buying wheels.
- ⚠️ Torque lugs in a star pattern to 100 ft-lbs (135 Nm), then re-check torque after 50-100 km (30-60 miles).
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2020 GMC Sierra 1500 Crew Cab — Frequently Asked Questions
What is the bolt pattern for a 2020 GMC Sierra 1500 Crew Cab?
The 2020 GMC Sierra 1500 Crew Cab uses a 6x139.7 bolt pattern (also called lug pattern or PCD). The center bore is 78.1mm and the offset is 20-30mm.
What other years of GMC Sierra 1500 Crew Cab have the same bolt pattern as the 2020?
The GMC Sierra 1500 Crew Cab uses the 6x139.7 pattern from 2004 through 2024. Wheels from any of these model years are dimensionally compatible with the 2020, provided the offset and center bore also match.
Can I use spacers on my 2020 GMC Sierra 1500 Crew Cab?
Yes, but ensure the wheel spacers match the 6x139.7 bolt pattern and 78.1mm center bore. Also verify that you have enough thread engagement for your 14x1.5 hardware.
What is the factory wheel offset for a 2020 GMC Sierra 1500 Crew Cab?
The OEM offset for the 2020 Sierra 1500 Crew Cab is typically around 20-30mm. Depending on wheel width, a deviation of ±5mm is usually acceptable, but verify suspension clearance.
What lug nut size does the 2020 GMC Sierra 1500 Crew Cab use?
The 2020 GMC Sierra 1500 Crew Cab uses 14x1.5 lug nuts. Always verify the thread pitch and seat type (cone, ball, or flat) match your aftermarket wheels.
What does 20-30mm offset mean for the 2020 Sierra 1500 Crew Cab?
An offset of 20-30mm means the wheel's mounting surface is 20-30mm away from its centerline. Changing this value drastically can affect suspension geometry and wheel bearing wear on your GMC.
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