2008 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 2008 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.
2008 Sierra 1500 Crew Cab — Year-Specific Fitment Context
The 2008 GMC Sierra 1500 Crew Cab is in year 5 of 21 using the 6x139.7 pattern (2004–2024). Wheels from any 2004–2024 GMC Sierra 1500 Crew Cab are cross-compatible with the 2008 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 2008 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 2008 GMC Sierra 1500 Crew Cab
For your 2008 GMC Sierra 1500 Crew Cab, the 6x139.7 bolt pattern is shared across 2004–2024 models, but critical specs differ. 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; aftermarket may require ball or conical. Improper seating can cause wheel loss. Verify lug nut thread engagement (minimum 6 full turns) and 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-lbs after 50-100 miles of driving to ensure proper seating.
- ✅ Avoid wheels with offset below 20mm; they may rub the fender or brake calipers on this model.
- ✅ Check for clearance with aftermarket wheels: the 2008 Sierra has large brake calipers that can interfere with certain spoke designs.
- ⚠️ 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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2008 GMC Sierra 1500 Crew Cab — Frequently Asked Questions
What is the bolt pattern for a 2008 GMC Sierra 1500 Crew Cab?
The 2008 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 2008?
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 2008, provided the offset and center bore also match.
How do I measure the bolt pattern on my 2008 GMC?
The 2008 Sierra 1500 Crew Cab uses a 6x139.7 pattern. For 4, 6, or 8-lug wheels, measure center-to-center across opposite holes. For 5-lug, measure from the center of one hole to the back of the opposite hole.
What is the PCD for a 2008 GMC Sierra 1500 Crew Cab?
PCD stands for Pitch Circle Diameter, which is the same as the bolt pattern. For the 2008 Sierra 1500 Crew Cab, the PCD is 6x139.7.
What lug nut size does the 2008 GMC Sierra 1500 Crew Cab use?
The 2008 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.
Do 2008 GMC Sierra 1500 Crew Cabs use lug bolts or lug nuts?
The 2008 Sierra 1500 Crew Cab requires 14x1.5 hardware. Check your specific trim to ensure you use the correct conical or spherical seating.
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