1999 GMC Yukon Bolt Pattern
Checking fitment for your vehicle? Below you will find the factory bolt pattern (also known as the lug pattern) for the 1999 GMC Yukon, 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.
1999 Yukon — Year-Specific Fitment Context
The 1999 GMC Yukon is in year 8 of 34 using the 6x139.7 pattern (1992–2025). Wheels from any 1992–2025 GMC Yukon are cross-compatible with the 1999 model.
GMC Yukon Bolt Pattern by Year
The table below shows how the Yukon's wheel specifications have changed over the years. The 1999 model year is highlighted.
| Year | Bolt Pattern | Center Bore | Offset |
|---|---|---|---|
| 1992 | 6x139.7 | 78.1 | 20-30 |
| 1993 | 6x139.7 | 78.1 | 20-30 |
| 1994 | 6x139.7 | 78.1 | 20-30 |
| 1995 | 6x139.7 | 78.1 | 20-30 |
| 1996 | 6x139.7 | 78.1 | 20-30 |
| 1997 | 6x139.7 | 78.1 | 20-30 |
| 1998 | 6x139.7 | 78.1 | 20-30 |
| ▸ 1999 | 6x139.7 | 78.1 | 20-30 |
| 2000 | 6x139.7 | 78.1 | 20-30 |
| 2001 | 6x139.7 | 78.1 | 20-30 |
| 2002 | 6x139.7 | 78.1 | 20-30 |
| 2003 | 6x139.7 | 78.1 | 20-30 |
| 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 |
| 2025 | 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 1999 GMC Yukon
For your 1999 GMC Yukon, the 6x139.7 bolt pattern is shared with 1992–2025 models, but aftermarket wheels require hub-centric rings (bore 78.1mm) to prevent vibration. Offset must stay within 20–30mm; deviations risk rubbing or poor handling. Always use 14x1.5 lug nuts with the correct seat (cone or ball) to avoid wheel loosening. Verify wheel load rating matches your vehicle's weight. Safety first: improper fitment can lead to catastrophic failure.
Historical Fitment Data Reference
In our dataset, GMC Yukon appears from 1992 to 2025 (34 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 ensure proper seating.
- ✅ Avoid wheels with a center bore larger than 78.1mm without hub rings; vibration and stress on studs may occur.
- ✅ Check for caliper clearance with aftermarket wheels, especially if offset is near the 20mm limit.
- ⚠️ 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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1999 GMC Yukon — Frequently Asked Questions
What is the bolt pattern for a 1999 GMC Yukon?
The 1999 GMC Yukon 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 Yukon have the same bolt pattern as the 1999?
The GMC Yukon uses the 6x139.7 pattern from 1992 through 2025. Wheels from any of these model years are dimensionally compatible with the 1999, provided the offset and center bore also match.
How do I measure the bolt pattern on my 1999 GMC?
The 1999 Yukon 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.
Can I use spacers on my 1999 GMC Yukon?
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 does 20-30mm offset mean for the 1999 Yukon?
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.
Why is matching the 78.1mm center bore important for the 1999 Yukon?
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.
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