1998 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 1998 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) |
Imperial Match: 6x139.7 is commonly referred to as 6x5.5" in US Standard.
1998 1500 Club Coupe — Year-Specific Fitment Context
The 1998 GMC 1500 Club Coupe is in year 7 of 8 using the 6x139.7 pattern (1992–1999). Wheels from any 1992–1999 GMC 1500 Club Coupe are cross-compatible with the 1998 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 1998 model year is highlighted.
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 1998 GMC 1500 Club Coupe
For your 1998 GMC 1500 Club Coupe, the 6x139.7 bolt pattern is shared across 1992–1999 models, ensuring cross-compatibility. The 78.1mm center bore requires hub-centric rings for aftermarket wheels to prevent vibration and hub damage. Offset must stay within 20–30mm; deviations risk rubbing or bearing stress. Always use 14x1.5 lug nuts with the correct seat (cone or ball) matching your wheel—mixing seat types can cause loosening. Re-torque after 50–100 miles to maintain clamping force.
Historical Fitment Data Reference
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
Quick Tips & Safety Warnings
- ✅ Re-torque lug nuts to 140 ft-lbs after 50–100 miles of driving.
- ✅ Verify wheel bore is ≥78.1mm; use hub-centric rings if larger.
- ✅ Avoid offset below 20mm to prevent tire rubbing on suspension.
- ⚠️ 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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1998 GMC 1500 Club Coupe — Frequently Asked Questions
What is the bolt pattern for a 1998 GMC 1500 Club Coupe?
The 1998 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 1998?
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 1998, provided the offset and center bore also match.
Can I use spacers on my 1998 GMC 1500 Club Coupe?
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 1998 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.
Why is matching the 78.1mm center bore important for the 1998 1500 Club Coupe?
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.
What is the PCD for a 1998 GMC 1500 Club Coupe?
PCD stands for Pitch Circle Diameter, which is the same as the bolt pattern. For the 1998 1500 Club Coupe, the PCD is 6x139.7.
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