2007 GMC Sierra (Classic) 1500 Extended Cab Bolt Pattern
Checking fitment for your vehicle? Below you will find the factory bolt pattern (also known as the lug pattern) for the 2007 GMC Sierra (Classic) 1500 Extended 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.
2007 Sierra (Classic) 1500 Extended Cab — Year-Specific Fitment Context
The 2007 is the only model year of the GMC Sierra (Classic) 1500 Extended Cab in our database using the 6x139.7 bolt pattern.
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 2007 GMC Sierra (Classic) 1500 Extended Cab
For your 2007 GMC Sierra (Classic) 1500 Extended Cab, the 6x139.7 bolt pattern and 78.1mm center bore are critical. Aftermarket wheels often have a larger center bore, requiring hub-centric rings to prevent vibration and ensure proper load distribution. The offset range of 20-30mm is sensitive; staying within this range avoids rubbing on suspension or fenders. Always use 14x1.5 lug nuts with the correct seat type—cone or ball seat—matching your wheels. Mismatched seats can cause loosening and wheel separation. Safety first: verify all specs before installation.
Historical Fitment Data Reference
In our dataset, GMC Sierra (Classic) 1500 Extended Cab appears from 2007 to 2007 (1 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 after 50-100 miles of driving to maintain clamping force.
- ✅ Check for clearance between the tire and upper control arm at full lock; aftermarket offsets near 20mm may require trimming.
- ✅ Use a thin coat of anti-seize on hub-centric rings to prevent corrosion and ease future removal.
- ⚠️ 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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2007 GMC Sierra (Classic) 1500 Extended Cab — Frequently Asked Questions
What is the bolt pattern for a 2007 GMC Sierra (Classic) 1500 Extended Cab?
The 2007 GMC Sierra (Classic) 1500 Extended 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.
Can I use spacers on my 2007 GMC Sierra (Classic) 1500 Extended 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.
Why is matching the 78.1mm center bore important for the 2007 Sierra (Classic) 1500 Extended Cab?
The 78.1mm center bore ensures the wheel is perfectly centered on the hub. If the wheel is lug-centric instead of hub-centric, you may experience steering wheel vibration at highway speeds.
Will wheels from another GMC fit my 2007 Sierra (Classic) 1500 Extended Cab?
Only if they share the exact same 6x139.7 bolt pattern, a compatible offset, and a center bore equal to or larger than 78.1mm.
What does 20-30mm offset mean for the 2007 Sierra (Classic) 1500 Extended 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.
How do I measure the bolt pattern on my 2007 GMC?
The 2007 Sierra (Classic) 1500 Extended 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.
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