1999 GMC Sonoma 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 1999 GMC Sonoma Extended Cab, along with offset and center bore data.
| Bolt Pattern (Lug Pattern) | 5x120.65 (5x4.75") |
|---|---|
| Lug Nut / Bolt Size | 12x1.5 |
| Center Bore (CB) | 70.3 mm |
| Offset (ET) | 0-13 |
| Torque Specs | 80 ft-lbs (108 Nm) |
1999 Sonoma Extended Cab — Year-Specific Fitment Context
The 1999 model year marks the beginning of the GMC Sonoma Extended Cab's 5x120.65 bolt pattern era, which continued through 2003 (5 consecutive years). Wheels from any 1999–2003 GMC Sonoma Extended Cab are cross-compatible with the 1999 model.
GMC Sonoma Extended Cab Bolt Pattern by Year
The table below shows how the Sonoma Extended Cab's wheel specifications have changed over the years. The 1999 model year is highlighted.
Fitment Notes
The 1999 GMC Sonoma Extended Cab has a bolt pattern of 5x120.65.
Imperial Conversion: This bolt pattern is commonly referred to as 5x4.75" in imperial units. When searching for aftermarket wheels, you may see them listed as 5x4.75".
This means it is a 5 lug pattern with a circle diameter of 120.65mm. When shopping for aftermarket wheels, ensure the "lug pattern" or "PCD" matches these numbers.
Year-to-Year Fitment Context
In our dataset, GMC Sonoma Extended Cab appears from 1999 to 2003 (5 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: 13.0 mm
5x120.65 Pattern Context
This bolt pattern appears on 202 vehicles in our current database and is considered moderately common.
Examples of other vehicles using 5x120.65:
1999 GMC Sonoma Extended Cab — Frequently Asked Questions
What is the bolt pattern for a 1999 GMC Sonoma Extended Cab?
The 1999 GMC Sonoma Extended Cab uses a 5x120.65 bolt pattern (also called lug pattern or PCD). The center bore is 70.3mm and the offset is 0-13mm.
What other years of GMC Sonoma Extended Cab have the same bolt pattern as the 1999?
The GMC Sonoma Extended Cab uses the 5x120.65 pattern from 1999 through 2003. Wheels from any of these model years are dimensionally compatible with the 1999, provided the offset and center bore also match.
Can I use spacers on my 1999 GMC Sonoma Extended Cab?
Yes, but ensure the wheel spacers match the 5x120.65 bolt pattern and 70.3mm center bore. Also verify that you have enough thread engagement for your 12x1.5 hardware.
How tight should I torque the lug nuts on a 1999 GMC Sonoma Extended Cab?
Refer to your owner's manual for exact specs, but always tighten the 12x1.5 hardware in a star or crisscross pattern. Re-torque after the first 50 miles of driving.
How do I measure the bolt pattern on my 1999 GMC?
The 1999 Sonoma Extended Cab uses a 5x120.65 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.
Will wheels from another GMC fit my 1999 Sonoma Extended Cab?
Only if they share the exact same 5x120.65 bolt pattern, a compatible offset, and a center bore equal to or larger than 70.3mm.
Fitment Checklist Before You Buy Wheels
- Verify thread pitch before installation; M12x1.25 and M12x1.5 are not interchangeable.
- Torque lugs in a star pattern to 80 ft-lbs (108 Nm), then re-check torque after 50-100 km (30-60 miles).
Editorial Fitment Notes
GMC Sonoma Extended Cab is generally consistent in bolt-pattern records across model years, but offset and hardware should still be validated before purchase.
- Observed production years in our database: 1999-2003 (5 model years).
- Observed bolt-pattern variants: 1 (5x120.65).
- Observed total offset span across years: 13.0 mm.
- Observed center-bore variants: 1 | lug-size variants: 1.
Data Quality & Review
Source note: Compiled from manufacturer fitment references, historical wheel data, and internal normalization rules.
Last reviewed: 2026-05-26 | Reviewed by: Bolt Pattern HQ Editorial Team
If you find a discrepancy for 1999 GMC Sonoma Extended Cab, please report it via our About page contact so we can verify and update this record.