1999 Buick Riviera Bolt Pattern
Checking fitment for your vehicle? Below you will find the factory bolt pattern (also known as the lug pattern) for the 1999 Buick Riviera, along with offset and center bore data.
| Bolt Pattern (Lug Pattern) | 5x115 |
|---|---|
| Lug Nut / Bolt Size | N 12x1.50 |
| Center Bore (CB) | 70.3 mm |
| Offset (ET) | 45 |
| Torque Specs | 80 ft-lbs (108 Nm) |
1999 Riviera — Year-Specific Fitment Context
The 1999 model year is the final year of the Buick Riviera's 5x115 bolt pattern run (since 1992). Wheels from any 1992–1999 Buick Riviera are cross-compatible with the 1999 model.
Buick Riviera Bolt Pattern by Year
The table below shows how the Riviera's wheel specifications have changed over the years. The 1999 model year is highlighted.
5x115 Pattern Context
This bolt pattern appears on 498 vehicles in our current database and is considered moderately common.
Examples of other vehicles using 5x115:
Expert Buying Guide for 1999 Buick Riviera
For the 1999 Buick Riviera, the 5x115 bolt pattern and 70.3mm center bore are critical. Aftermarket wheels often have a larger center bore, requiring hub-centric rings to prevent vibration and ensure proper load transfer. The factory offset is 45mm; deviations beyond ±5mm may cause rubbing or clearance issues. Use only lug nuts with 12x1.5 thread pitch and correct seat type (conical or ball seat) to avoid wheel loosening. Always torque to manufacturer specs and re-torque after 50-100 miles.
Historical Fitment Data Reference
In our dataset, Buick Riviera appears from 1992 to 1999 (7 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: 0.0 mm
Quick Tips & Safety Warnings
- ✅ Re-torque lug nuts after 50-100 miles of driving to ensure proper seating.
- ✅ Verify wheel hub bore is at least 70.3mm; use hub-centric rings if larger.
- ✅ Avoid spacers without extended studs; they can alter offset and stress suspension.
- ⚠️ 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).
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1999 Buick Riviera — Frequently Asked Questions
What is the bolt pattern for a 1999 Buick Riviera?
The 1999 Buick Riviera uses a 5x115 bolt pattern (also called lug pattern or PCD). The center bore is 70.3mm and the offset is 45mm.
What other years of Buick Riviera have the same bolt pattern as the 1999?
The Buick Riviera uses the 5x115 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.
Can I use spacers on my 1999 Buick Riviera?
Yes, but ensure the wheel spacers match the 5x115 bolt pattern and 70.3mm center bore. Also verify that you have enough thread engagement for your N 12x1.50 hardware.
What does 45mm offset mean for the 1999 Riviera?
An offset of 45mm means the wheel's mounting surface is 45mm away from its centerline. Changing this value drastically can affect suspension geometry and wheel bearing wear on your Buick.
How tight should I torque the lug nuts on a 1999 Buick Riviera?
Refer to your owner's manual for exact specs, but always tighten the N 12x1.50 hardware in a star or crisscross pattern. Re-torque after the first 50 miles of driving.
What is the PCD for a 1999 Buick Riviera?
PCD stands for Pitch Circle Diameter, which is the same as the bolt pattern. For the 1999 Riviera, the PCD is 5x115.
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