1998 Chevrolet 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 1998 Chevrolet 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) | 24-28 |
| Torque Specs | 100 ft-lbs (135 Nm) |
Imperial Match: 6x139.7 is commonly referred to as 6x5.5" in US Standard.
1998 1500 Extended Cab — Year-Specific Fitment Context
The 1998 Chevrolet 1500 Extended Cab is in year 7 of 8 using the 6x139.7 pattern (1992–1999). Wheels from any 1992–1999 Chevrolet 1500 Extended Cab are cross-compatible with the 1998 model.
Chevrolet 1500 Extended Cab Bolt Pattern by Year
The table below shows how the 1500 Extended Cab'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 Chevrolet 1500 Extended Cab
For your 1998 Chevrolet 1500 Extended Cab, the 6x139.7 bolt pattern is shared with 1992-1999 models, but center bore is critical: 78.1mm. Aftermarket wheels often have larger bores (e.g., 108mm), requiring hub-centric rings to prevent vibration and ensure proper load transfer. Offset must stay within 24-28mm; deviations risk rubbing on suspension or fenders. Always use lug nuts with the correct 14x1.5 thread pitch and proper seat type (cone or ball) matching the wheel. Incorrect lug nuts can cause wheel separation. Re-torque after 50-100 miles of driving.
Historical Fitment Data Reference
In our dataset, Chevrolet 1500 Extended Cab 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: 52.0 mm
Quick Tips & Safety Warnings
- ✅ Re-torque lug nuts to 140 ft-lbs after 50-100 miles.
- ✅ Check for caliper clearance with aftermarket wheels; some designs may require spacers.
- ✅ Avoid wheels with offset below 24mm or above 28mm to prevent rubbing or bearing stress.
- ⚠️ 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 Chevrolet 1500 Extended Cab — Frequently Asked Questions
What is the bolt pattern for a 1998 Chevrolet 1500 Extended Cab?
The 1998 Chevrolet 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 24-28mm.
What other years of Chevrolet 1500 Extended Cab have the same bolt pattern as the 1998?
The Chevrolet 1500 Extended Cab 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.
What lug nut size does the 1998 Chevrolet 1500 Extended Cab use?
The 1998 Chevrolet 1500 Extended Cab uses 14x1.5 lug nuts. Always verify the thread pitch and seat type (cone, ball, or flat) match your aftermarket wheels.
What is the PCD for a 1998 Chevrolet 1500 Extended Cab?
PCD stands for Pitch Circle Diameter, which is the same as the bolt pattern. For the 1998 1500 Extended Cab, the PCD is 6x139.7.
Do 1998 Chevrolet 1500 Extended Cabs use lug bolts or lug nuts?
The 1998 1500 Extended Cab requires 14x1.5 hardware. Check your specific trim to ensure you use the correct conical or spherical seating.
Why is matching the 78.1mm center bore important for the 1998 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.
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