1999 Chevrolet Silverado 1500 Regular Cab Bolt Pattern
Checking fitment for your vehicle? Below you will find the factory bolt pattern (also known as the lug pattern) for the 1999 Chevrolet Silverado 1500 Regular Cab, along with offset and center bore data.
| Bolt Pattern (Lug Pattern) | 6x139.7 (6x5.5") |
|---|---|
| Lug Nut / Bolt Size | N 14x1.50 |
| Center Bore (CB) | 78.1 mm |
| Offset (ET) | 16 |
| Torque Specs | 100 ft-lbs (135 Nm) |
Imperial Match: 6x139.7 is commonly referred to as 6x5.5" in US Standard.
1999 Silverado 1500 Regular Cab — Year-Specific Fitment Context
The 1999 model year marks the beginning of the Chevrolet Silverado 1500 Regular Cab's 6x139.7 bolt pattern era, which continued through 2024 (26 consecutive years). Wheels from any 1999–2024 Chevrolet Silverado 1500 Regular Cab are cross-compatible with the 1999 model.
Chevrolet Silverado 1500 Regular Cab Bolt Pattern by Year
The table below shows how the Silverado 1500 Regular Cab's wheel specifications have changed over the years. The 1999 model year is highlighted.
| Year | Bolt Pattern | Center Bore | Offset |
|---|---|---|---|
| ▸ 1999 | 6x139.7 | 78.1 | 16 |
| 2000 | 6x139.7 | 78.1 | 16 |
| 2001 | 6x139.7 | 78.1 | 16 |
| 2002 | 6x139.7 | 78.1 | 16 |
| 2003 | 6x139.7 | 78.1 | 16 |
| 2004 | 6x139.7 | 78.1 | 16 |
| 2005 | 6x139.7 | 78.1 | 16 |
| 2006 | 6x139.7 | 78.1 | 16 |
| 2007 | 6x139.7 | 78.1 | 16 |
| 2008 | 6x139.7 | 78.1 | 16 |
| 2009 | 6x139.7 | 78.1 | 26 |
| 2010 | 6x139.7 | 78.1 | 26 |
| 2011 | 6x139.7 | 78.1 | 26 |
| 2012 | 6x139.7 | 78.1 | 26 |
| 2013 | 6x139.7 | 78.1 | 26 |
| 2014 | 6x139.7 | 78.1 | 26 |
| 2015 | 6x139.7 | 78.1 | 26 |
| 2016 | 6x139.7 | 78.1 | 26 |
| 2017 | 6x139.7 | 78.1 | 26 |
| 2018 | 6x139.7 | 78.1 | 26 |
| 2019 | 6x139.7 | 78.1 | 24-28 |
| 2020 | 6x139.7 | 78.1 | 24-28 |
| 2021 | 6x139.7 | 78.1 | 24-28 |
| 2022 | 6x139.7 | 78.1 | 24-28 |
| 2023 | 6x139.7 | 78.1 | 24-28 |
| 2024 | 6x139.7 | 78.1 | 24-28 |
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 Chevrolet Silverado 1500 Regular Cab
The 1999 Chevrolet Silverado 1500 Regular Cab uses a 6x139.7 bolt pattern with a 78.1mm center bore. When selecting aftermarket wheels, ensure hub-centric rings are used to match the bore precisely, preventing vibrations. The factory offset is 16mm; deviations beyond ±10mm may cause clearance issues with suspension or body components. Always verify lug nut compatibility: this vehicle requires 14x1.50 thread pitch with a conical (60-degree) seat. Using incorrect lug nuts (e.g., ball seat) can lead to wheel loosening. For safety, re-torque lug nuts after 50-100 miles of driving.
Historical Fitment Data Reference
In our dataset, Chevrolet Silverado 1500 Regular Cab appears from 1999 to 2024 (26 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: 2
- Observed total offset span across years: 54.0 mm
Quick Tips & Safety Warnings
- ✅ Re-torque lug nuts to 140 ft-lb after 50-100 miles of driving.
- ✅ Avoid using wheels with a center bore larger than 78.1mm without hub-centric rings.
- ✅ Check for caliper clearance when using wheels with offset less than 6mm or more than 26mm.
- ⚠️ 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 Chevrolet Silverado 1500 Regular Cab — Frequently Asked Questions
What is the bolt pattern for a 1999 Chevrolet Silverado 1500 Regular Cab?
The 1999 Chevrolet Silverado 1500 Regular Cab uses a 6x139.7 bolt pattern (also called lug pattern or PCD). The center bore is 78.1mm and the offset is 16mm.
What other years of Chevrolet Silverado 1500 Regular Cab have the same bolt pattern as the 1999?
The Chevrolet Silverado 1500 Regular Cab uses the 6x139.7 pattern from 1999 through 2024. Wheels from any of these model years are dimensionally compatible with the 1999, provided the offset and center bore also match.
How tight should I torque the lug nuts on a 1999 Chevrolet Silverado 1500 Regular Cab?
Refer to your owner's manual for exact specs, but always tighten the N 14x1.50 hardware in a star or crisscross pattern. Re-torque after the first 50 miles of driving.
What is the center bore of a 1999 Chevrolet Silverado 1500 Regular Cab?
The factory center bore (hub bore) for the 1999 Chevrolet Silverado 1500 Regular Cab is 78.1mm. If your aftermarket wheels have a larger hub bore, you will need hub-centric rings to prevent vibration.
What is the PCD for a 1999 Chevrolet Silverado 1500 Regular Cab?
PCD stands for Pitch Circle Diameter, which is the same as the bolt pattern. For the 1999 Silverado 1500 Regular Cab, the PCD is 6x139.7.
Why is matching the 78.1mm center bore important for the 1999 Silverado 1500 Regular 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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