1999 GMC 3500 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 GMC 3500 Regular Cab, along with offset and center bore data.
| Bolt Pattern (Lug Pattern) | 8x165.1 (8x6.5") |
|---|---|
| Lug Nut / Bolt Size | 14x1.5 |
| Center Bore (CB) | 116.7 mm |
| Offset (ET) | 20-40 |
| Torque Specs | 140 ft-lbs (190 Nm) |
Imperial Match: 8x165.1 is commonly referred to as 8x6.5" in US Standard.
1999 3500 Regular Cab — Year-Specific Fitment Context
The 1999 model year is the final year of the GMC 3500 Regular Cab's 8x165.1 bolt pattern run (since 1992). Wheels from any 1992–1999 GMC 3500 Regular Cab are cross-compatible with the 1999 model.
GMC 3500 Regular Cab Bolt Pattern by Year
The table below shows how the 3500 Regular Cab's wheel specifications have changed over the years. The 1999 model year is highlighted.
8x165.1 Pattern Context
This bolt pattern appears on 846 vehicles in our current database and is considered common.
Examples of other vehicles using 8x165.1:
Expert Buying Guide for 1999 GMC 3500 Regular Cab
For your 1999 GMC 3500 Regular Cab, the 8x165.1 bolt pattern is shared with 1992-1999 models. The critical center bore is 116.7mm; aftermarket wheels often have a larger bore, requiring hub-centric rings to prevent vibration and ensure proper load transfer. Offset must stay within 20-40mm to avoid rubbing or suspension interference. Always use lug nuts with the correct 14x1.5 thread pitch and matching seat type (cone or ball) to prevent loosening or wheel damage. Verify hub bore compatibility before purchase.
Historical Fitment Data Reference
In our dataset, GMC 3500 Regular 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: 60.0 mm
Quick Tips & Safety Warnings
- ✅ Re-torque lug nuts after 50-100 miles of driving to maintain clamping force.
- ✅ Avoid using universal fit wheels without hub-centric rings; they can cause vibration and stress on studs.
- ✅ Check for clearance with brake calipers and suspension components, especially with wider wheels or lower offsets.
- ⚠️ This fitment uses a wide offset range. Check brake clearance and fender clearance before buying wheels.
- ⚠️ Torque lugs in a star pattern to 140 ft-lbs (190 Nm), then re-check torque after 50-100 km (30-60 miles).
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1999 GMC 3500 Regular Cab — Frequently Asked Questions
What is the bolt pattern for a 1999 GMC 3500 Regular Cab?
The 1999 GMC 3500 Regular Cab uses a 8x165.1 bolt pattern (also called lug pattern or PCD). The center bore is 116.7mm and the offset is 20-40mm.
What other years of GMC 3500 Regular Cab have the same bolt pattern as the 1999?
The GMC 3500 Regular Cab uses the 8x165.1 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.
What lug nut size does the 1999 GMC 3500 Regular Cab use?
The 1999 GMC 3500 Regular Cab uses 14x1.5 lug nuts. Always verify the thread pitch and seat type (cone, ball, or flat) match your aftermarket wheels.
How do I measure the bolt pattern on my 1999 GMC?
The 1999 3500 Regular Cab uses a 8x165.1 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 is the center bore of a 1999 GMC 3500 Regular Cab?
The factory center bore (hub bore) for the 1999 GMC 3500 Regular Cab is 116.7mm. If your aftermarket wheels have a larger hub bore, you will need hub-centric rings to prevent vibration.
Do 1999 GMC 3500 Regular Cabs use lug bolts or lug nuts?
The 1999 3500 Regular Cab requires 14x1.5 hardware. Check your specific trim to ensure you use the correct conical or spherical seating.
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