Alfa Romeo 8C Spider Wheel Lug Pattern, Offset & Rim Size Reference
The Alfa Romeo 8C Spider requires specific wheel lug patterns to ensure proper fitment and safe operation. The wheel lug pattern, defined by the number of lugs and the pitch circle diameter (PCD), is essential for matching wheels to the hub.\n\nThis model typically features a lug pattern of 5×110 mm, complemented by an offset (ET) range designed for optimal clearance and handling. The center bore size is equally critical to guarantee that wheels mount perfectly without causing vibrations or imbalance.\n\nWheel rim sizes for the Alfa Romeo 8C Spider vary depending on the production year, with commonly available diameters ranging from 19 to 20 inches. Our year-sorted reference table offers detailed dimensions, including offset and center bore measurements, to assist in selecting compatible wheels for your vehicle.\n\nConsulting precise wheel fitment data enables Alfa Romeo 8C Spider owners and enthusiasts to maintain vehicle performance, safety, and style when selecting aftermarket or replacement wheels.
| Make / model / trim | Year | Tire | Rim width (in) | Rim diam. (in) | Bolt pattern | Offset ET | Bore DIA | Mounting |
|---|---|---|---|---|---|---|---|---|
| Alfa Romeo 8C Spider 4.7 | 2010 | 245/40R20 | 8.5 | 20 | 5×110 | 36 | 65.1 | M14*1,5 |
| Alfa Romeo 8C Spider 4.7 | 2009 | 245/40R20 | 8.5 | 20 | 5×110 | 36 | 65.1 | M14*1,5 |
| Alfa Romeo 8C Spider 4.7 | 2008 | 245/40R20 | 8.5 | 20 | 5×110 | 36 | 65.1 | M14*1,5 |
FAQ
- What is the lug pattern specification for the Alfa Romeo 8C Spider?
- The Alfa Romeo 8C Spider features a 5×110 mm lug pattern, meaning five lugs with a 110 mm pitch circle diameter.
- Why is offset ET important for Alfa Romeo 8C Spider wheels?
- Offset ET affects wheel positioning relative to the suspension and fenders, impacting handling and clearance, making it critical for proper fitment.
- How does center bore size influence wheel fitment on the 8C Spider?
- The center bore must match the vehicle hub diameter to ensure wheels mount securely and prevent vibrations.
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 |
