1998 Pontiac Trans Sport Bolt Pattern
Checking fitment for your vehicle? Below you will find the factory bolt pattern (also known as the lug pattern) for the 1998 Pontiac Trans Sport, 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) |
1998 Trans Sport — Year-Specific Fitment Context
The 1998 model year is the final year of the Pontiac Trans Sport's 5x115 bolt pattern run (since 1992). Wheels from any 1992–1998 Pontiac Trans Sport are cross-compatible with the 1998 model.
Pontiac Trans Sport Bolt Pattern by Year
The table below shows how the Trans Sport's wheel specifications have changed over the years. The 1998 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 1998 Pontiac Trans Sport
For your 1998 Pontiac Trans Sport, the 5x115 bolt pattern and 70.3mm center bore are critical. Aftermarket wheels often have a larger center bore (e.g., 73.1mm), requiring hub-centric rings to prevent vibrations and ensure proper load transfer. The factory offset is 45mm; staying within ±5mm is recommended to avoid rubbing or clearance issues. Always use lug nuts with the correct thread pitch (12x1.50) and seat type—factory wheels use a conical (60-degree) seat, while aftermarket may require ball or conical seats. Never mix seat types. Re-torque lug nuts after 50-100 miles of driving.
Historical Fitment Data Reference
In our dataset, Pontiac Trans Sport appears from 1992 to 1998 (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: 5.0 mm
Quick Tips & Safety Warnings
- ✅ Re-torque lug nuts to 100 ft-lbs after 50-100 miles of driving.
- ✅ If using aftermarket wheels, verify hub-centric ring inner diameter matches 70.3mm and outer diameter matches wheel bore.
- ✅ Avoid wheels with offset below 40mm or above 50mm to prevent fender rubbing or brake caliper contact.
- ⚠️ 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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1998 Pontiac Trans Sport — Frequently Asked Questions
What is the bolt pattern for a 1998 Pontiac Trans Sport?
The 1998 Pontiac Trans Sport 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 Pontiac Trans Sport have the same bolt pattern as the 1998?
The Pontiac Trans Sport uses the 5x115 pattern from 1992 through 1998. Wheels from any of these model years are dimensionally compatible with the 1998, provided the offset and center bore also match.
What lug nut size does the 1998 Pontiac Trans Sport use?
The 1998 Pontiac Trans Sport uses N 12x1.50 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 Pontiac Trans Sport?
Absolutely. Just ensure the aftermarket wheels have a 5x115 bolt pattern, an offset near 45mm, and a center bore of at least 70.3mm (using hub rings if larger).
What is the factory wheel offset for a 1998 Pontiac Trans Sport?
The OEM offset for the 1998 Trans Sport is typically around 45mm. Depending on wheel width, a deviation of ±5mm is usually acceptable, but verify suspension clearance.
What does 45mm offset mean for the 1998 Trans Sport?
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 Pontiac.
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