Alfa Romeo 8C Spider Tire Size Guide by Year & Trim | Rim Dimensions
The Alfa Romeo 8C Spider features specific tire size markings that vary slightly based on model year and trim. Understanding these markings is crucial for selecting the right tires to maintain performance and safety.\n\nCommon rim widths and diameters for the 8C Spider typically range from 19 to 20 inches in diameter, with widths between 8.5 and 10 inches depending on the trim. These dimensions impact handling characteristics and should be matched accurately when replacing tires or rims.\n\nWhen comparing trims of the Alfa Romeo 8C Spider, pay attention to the original equipment tire size stamped on the sidewall, which includes width, aspect ratio, and diameter. This ensures compatibility and preserves the vehicle’s intended driving dynamics.\n\nConsulting manufacturer-specified tire sizes by model year and trim helps avoid mismatches. This is particularly important for maintaining speedometer accuracy and overall vehicle balance.
| Make / model / trim | Year | Tire size | Wheel |
|---|---|---|---|
| Alfa Romeo 8C Spider 4.7 | 2010 | 245/40R20 | 8.5" × 20" |
| Alfa Romeo 8C Spider 4.7 | 2009 | 245/40R20 | 8.5" × 20" |
| Alfa Romeo 8C Spider 4.7 | 2008 | 245/40R20 | 8.5" × 20" |
For bolt pattern (PCD), offset ET, center bore, and mounting details, open the bolt pattern page for Alfa Romeo 8C Spider.
FAQ
- What tire size does the Alfa Romeo 8C Spider use?
- Tire sizes vary by model year and trim, commonly ranging from 235/35 R19 to 265/35 R20.
- How do rim width and diameter affect tire choice?
- Rim width and diameter must match the tire's specifications to ensure proper fit, safety, and performance.
- Can I use tires from different trims on my Alfa Romeo 8C Spider?
- It's best to use tires matching your trim's exact size to maintain handling and avoid speedometer errors.
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 |
