Pontiac Grand AM Wheel Lug Pattern, Offset, and Center Bore Specifications
The Pontiac Grand AM wheel lug pattern varies slightly depending on the production year and trim. The lug pattern specifies the number of lugs and the pitch circle diameter (PCD) in millimeters, essential for selecting compatible wheels that ensure safe and proper fitment.\n\nOffset (ET) values for Pontiac Grand AM wheels typically range within factory specifications, influencing wheel positioning relative to the fender and suspension components. Correct offset maintains handling performance and prevents tire rubbing.\n\nCenter bore dimensions are equally important to ensure the wheel mounts concentrically on the hub, reducing vibrations and maintaining secure attachment. Rim sizes commonly approved for the Pontiac Grand AM cover a range that balances ride comfort and aesthetic appeal.\n\nRefer to the year-sorted Pontiac Grand AM wheel lug pattern catalog on this site for precise specifications, including lug count × PCD, recommended offset values, center bore diameters, and compatible rim sizes to assist in selecting the right wheels.
| Make / model / trim | Year | Tire | Rim width (in) | Rim diam. (in) | Bolt pattern | Offset ET | Bore DIA | Mounting |
|---|---|---|---|---|---|---|---|---|
| Pontiac Grand AM 2.2i | 2005 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.4i | 2005 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 3.4i GT | 2005 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.2i | 2004 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.4i | 2004 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 3.4i GT | 2004 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.2i | 2003 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.4i | 2003 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 3.4i GT | 2003 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.2i | 2002 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.4i | 2002 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 3.4i GT | 2002 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.2i | 2001 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.4i | 2001 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 3.4i GT | 2001 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.2i | 2000 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.4i | 2000 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 3.4i GT | 2000 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.2i | 1999 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.4i | 1999 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 3.4i GT | 1999 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.2i | 1998 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 2.4i | 1998 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
| Pontiac Grand AM 3.4i GT | 1998 | 215/60R15 | 7 | 15 | 5×115 | 48 | 70.3 | M12*1,5 |
FAQ
- What is the standard lug pattern size for the Pontiac Grand AM?
- Most Pontiac Grand AM models use a 5-lug pattern with a 4x100mm or 5x110mm PCD, depending on the year and model variant.
- Why is offset (ET) important when choosing wheels for a Pontiac Grand AM?
- Offset affects wheel positioning relative to suspension and body components. Using the correct ET value ensures proper clearance and maintains handling characteristics.
- Can I use wheels with a different center bore on my Pontiac Grand AM?
- Using wheels with a center bore that is larger than the hub can result in vibrations and fitment issues. Hub-centric rings can help, but it's best to match the original center bore when possible.
Tire size calculatorShow
Compare two tire sizes — diameter, speedometer error, and clearance change.
| Size 1 | Size 2 | Diff | Diff(%) | |
|---|---|---|---|---|
| Diameter | 25.0" | 25.4" | 0.5" | 1.89% |
| Width | 7.7" | 8.5" | 0.8" | 10.26% |
| Circumference | 78.4" | 79.9" | 1.5" | 1.86% |
| Profile height | 5.0" | 4.2" | -0.7" | -15.08% |
| Turnover per mile | 807 | 793 | 14 | -1.73% |
| Clearance | - | - | +0.2" | - |
Speedometer Error
(First wheel OEM size)
| Reading | 20 mph | 30 mph | 40 mph | 50 mph | 60 mph | 70 mph | 80 mph | 90 mph |
|---|---|---|---|---|---|---|---|---|
| Actual | 20.4 | 30.5 | 40.7 | 50.9 | 61.1 | 71.2 | 81.4 | 91.6 |