1999 GMC 1500 Club Coupe 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 1500 Club Coupe, 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) |
1999 1500 Club Coupe — Year-Specific Fitment Context
The 1999 model year is the final year of the GMC 1500 Club Coupe's 6x139.7 bolt pattern run (since 1992). Wheels from any 1992–1999 GMC 1500 Club Coupe are cross-compatible with the 1999 model.
GMC 1500 Club Coupe Bolt Pattern by Year
The table below shows how the 1500 Club Coupe's wheel specifications have changed over the years. The 1999 model year is highlighted.
Fitment Notes
The 1999 GMC 1500 Club Coupe has a bolt pattern of 6x139.7.
Imperial Conversion: This bolt pattern is commonly referred to as 6x5.5" in imperial units. When searching for aftermarket wheels, you may see them listed as 6x5.5".
This means it is a 6 lug pattern with a circle diameter of 139.7mm. When shopping for aftermarket wheels, ensure the "lug pattern" or "PCD" matches these numbers.
Year-to-Year Fitment Context
In our dataset, GMC 1500 Club Coupe appears from 1992 to 1999 (8 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
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:
1999 GMC 1500 Club Coupe — Frequently Asked Questions
What is the bolt pattern for a 1999 GMC 1500 Club Coupe?
The 1999 GMC 1500 Club Coupe 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 1500 Club Coupe have the same bolt pattern as the 1999?
The GMC 1500 Club Coupe uses the 6x139.7 pattern from 1992 through 1999. Wheels from any of these model years are dimensionally compatible with the 1999, provided the offset and center bore also match.
Can I put aftermarket wheels on my 1999 GMC 1500 Club Coupe?
Absolutely. Just ensure the aftermarket wheels have a 6x139.7 bolt pattern, an offset near 20-30mm, and a center bore of at least 78.1mm (using hub rings if larger).
Do 1999 GMC 1500 Club Coupes use lug bolts or lug nuts?
The 1999 1500 Club Coupe requires 14x1.5 hardware. Check your specific trim to ensure you use the correct conical or spherical seating.
How do I measure the bolt pattern on my 1999 GMC?
The 1999 1500 Club Coupe 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 does 20-30mm offset mean for the 1999 1500 Club Coupe?
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.
Fitment Checklist Before You Buy Wheels
- 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).
Editorial Fitment Notes
GMC 1500 Club Coupe is generally consistent in bolt-pattern records across model years, but offset and hardware should still be validated before purchase.
- Observed production years in our database: 1992-1999 (8 model years).
- Observed bolt-pattern variants: 1 (6x139.7).
- Observed total offset span across years: 50.0 mm.
- Observed center-bore variants: 1 | lug-size variants: 1.
Data Quality & Review
Source note: Compiled from manufacturer fitment references, historical wheel data, and internal normalization rules.
Last reviewed: 2026-05-26 | Reviewed by: Bolt Pattern HQ Editorial Team
If you find a discrepancy for 1999 GMC 1500 Club Coupe, please report it via our About page contact so we can verify and update this record.