The wheels on the Honda Civic Si are typically 18 inches in diameter, with 8-inch-wide rims and 235/40R18 tires on the current models.
Current-generation wheel specs
For the latest Civic Si models—part of the 11th generation launched for the 2022 model year—the factory setup is designed around an 18-inch wheel package. This pairing balances sportiness with ride comfort and is the standard configuration across most trims.
Key figures for the stock setup are:
- Wheel diameter: 18 inches
- Wheel width: 8 inches
- Tire size: 235/40R18
- Wheel type: 5-lug aluminum alloy
A note for buyers: wheel size and offset can vary by model year or trim, and some special editions or dealer packages may use different sizing. Always verify the exact specs for your exact vehicle or VIN.
Why this size matters
The 18x8 wheel size helps maintain appropriate brake clearance and suspension geometry while fitting the common tire options available in the market. It also preserves the Civic Si’s handling characteristics, particularly when paired with the 1.5-liter turbo engine in the Si trim.
Summary
In short, the current Civic Si uses 18-inch wheels, typically 18x8 with 235/40R18 tires. If you're shopping for wheels or tires, use this as a baseline and always confirm your specific year and trim to ensure proper fitment and performance.