1999 GMC Savana 1500 Cargo 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 Savana 1500 Cargo, 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.
1999 Savana 1500 Cargo — Year-Specific Fitment Context
The 1999 GMC Savana 1500 Cargo is in year 4 of 19 using the 6x139.7 pattern (1996–2014). Wheels from any 1996–2014 GMC Savana 1500 Cargo are cross-compatible with the 1999 model.
GMC Savana 1500 Cargo Bolt Pattern by Year
The table below shows how the Savana 1500 Cargo's wheel specifications have changed over the years. The 1999 model year is highlighted.
| Year | Bolt Pattern | Center Bore | Offset |
|---|---|---|---|
| 1996 | 6x139.7 | 78.1 | 20-30 |
| 1997 | 6x139.7 | 78.1 | 20-30 |
| 1998 | 6x139.7 | 78.1 | 20-30 |
| ▸ 1999 | 6x139.7 | 78.1 | 20-30 |
| 2000 | 6x139.7 | 78.1 | 20-30 |
| 2001 | 6x139.7 | 78.1 | 20-30 |
| 2002 | 6x139.7 | 78.1 | 20-30 |
| 2003 | 6x139.7 | 78.1 | 20-30 |
| 2004 | 6x139.7 | 78.1 | 20-30 |
| 2005 | 6x139.7 | 78.1 | 20-30 |
| 2006 | 6x139.7 | 78.1 | 20-30 |
| 2007 | 6x139.7 | 78.1 | 20-30 |
| 2008 | 6x139.7 | 78.1 | 20-30 |
| 2009 | 6x139.7 | 78.1 | 20-30 |
| 2010 | 6x139.7 | 78.1 | 20-30 |
| 2011 | 6x139.7 | 78.1 | 20-30 |
| 2012 | 6x139.7 | 78.1 | 20-30 |
| 2013 | 6x139.7 | 78.1 | 20-30 |
| 2014 | 6x139.7 | 78.1 | 20-30 |
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 GMC Savana 1500 Cargo
For your 1999 GMC Savana 1500 Cargo, the bolt pattern is 6x139.7mm with a critical center bore of 78.1mm. Aftermarket wheels often have a larger bore; use hub-centric rings to prevent vibration and ensure proper load distribution. Offset must stay within 20-30mm; deviations risk rubbing or poor handling. Always use lug nuts with 14x1.5 thread pitch and correct seat type (cone or ball) matching your wheels—mismatched seats cause loosening. Re-torque after 50-100 miles. Wheels from 1996-2014 Savana 1500 Cargo are compatible, but verify bore and offset.
Historical Fitment Data Reference
In our dataset, GMC Savana 1500 Cargo appears from 1996 to 2014 (19 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
- ✅ Always use hub-centric rings if aftermarket wheels have a larger center bore than 78.1mm to avoid vibration.
- ✅ Stick to offset between 20-30mm; lower offset may rub suspension, higher offset may contact brake calipers.
- ✅ Re-torque lug nuts to spec (140 ft-lbs) after 50-100 miles of driving to ensure proper seating.
- ⚠️ 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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1999 GMC Savana 1500 Cargo — Frequently Asked Questions
What is the bolt pattern for a 1999 GMC Savana 1500 Cargo?
The 1999 GMC Savana 1500 Cargo 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 Savana 1500 Cargo have the same bolt pattern as the 1999?
The GMC Savana 1500 Cargo uses the 6x139.7 pattern from 1996 through 2014. Wheels from any of these model years are dimensionally compatible with the 1999, provided the offset and center bore also match.
What is the center bore of a 1999 GMC Savana 1500 Cargo?
The factory center bore (hub bore) for the 1999 GMC Savana 1500 Cargo is 78.1mm. If your aftermarket wheels have a larger hub bore, you will need hub-centric rings to prevent vibration.
How do I measure the bolt pattern on my 1999 GMC?
The 1999 Savana 1500 Cargo 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.
Do 1999 GMC Savana 1500 Cargos use lug bolts or lug nuts?
The 1999 Savana 1500 Cargo requires 14x1.5 hardware. Check your specific trim to ensure you use the correct conical or spherical seating.
Will wheels from another GMC fit my 1999 Savana 1500 Cargo?
Only if they share the exact same 6x139.7 bolt pattern, a compatible offset, and a center bore equal to or larger than 78.1mm.
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