1998 GMC Suburban 1500 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 Suburban 1500, 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 Suburban 1500 — Year-Specific Fitment Context
The 1998 GMC Suburban 1500 is in year 7 of 8 using the 6x139.7 pattern (1992–1999). Wheels from any 1992–1999 GMC Suburban 1500 are cross-compatible with the 1998 model.
GMC Suburban 1500 Bolt Pattern by Year
The table below shows how the Suburban 1500'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 Suburban 1500
For your 1998 GMC Suburban 1500, the 6x139.7 bolt pattern is shared across 1992–1999 models, ensuring cross-compatibility. However, the 78.1mm center bore is critical: aftermarket wheels often have a larger bore, requiring hub-centric rings to prevent vibration and ensure proper load transfer. Offset must stay within 20–30mm; deviations risk rubbing on suspension or fenders. Always use 14x1.5 lug nuts with correct seat type—factory wheels use conical (60-degree) seats, while aftermarket may require ball or flat seats. Mismatched lug nuts can cause wheel loosening. Verify thread engagement (at least 6 full turns) and torque to manufacturer specs.
Historical Fitment Data Reference
In our dataset, GMC Suburban 1500 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 after 50–100 miles of driving to account for settling.
- ✅ Avoid using universal fit wheels without hub-centric rings; they can cause steering wheel vibration.
- ✅ Check for caliper clearance with aftermarket wheels, especially if offset is near 20mm.
- ⚠️ 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 Suburban 1500 — Frequently Asked Questions
What is the bolt pattern for a 1998 GMC Suburban 1500?
The 1998 GMC Suburban 1500 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 Suburban 1500 have the same bolt pattern as the 1998?
The GMC Suburban 1500 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.
Will wheels from another GMC fit my 1998 Suburban 1500?
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.
What lug nut size does the 1998 GMC Suburban 1500 use?
The 1998 GMC Suburban 1500 uses 14x1.5 lug nuts. Always verify the thread pitch and seat type (cone, ball, or flat) match your aftermarket wheels.
Can I put aftermarket wheels on my 1998 GMC Suburban 1500?
Absolutely. Just ensure the aftermarket wheels have a 6x139.7 bolt pattern, an offset near 20-30mm, and a center bore of at least 78.1mm (using hub rings if larger).
How do I measure the bolt pattern on my 1998 GMC?
The 1998 Suburban 1500 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.
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