Honda FC1 - Civic Si Fitment Guide

Wheel, tire, and stance recommendations for Honda FC1 - Civic Si, built from Offset Lab fitment presets and factory baseline data.

Popular setup

Flush fitment

Front

18x8.5 +38

245/40R18

Rear

18x8.5 +38

245/40R18

Factory baseline for Si: 18x8 +40 on 235/40R18.

Recommendations

Trims and setup styles

Open fitment tool

Trim

Si

Factory: 18x8 +40

235/40R18

5x114.3 · 64.1mm

Aggressive

Front: 18x9.5 +38

Rear: 18x9.5 +38

Tires: 255/35R18

Moderate

Flush

Front: 18x8.5 +38

Rear: 18x8.5 +38

Tires: 245/40R18

Low / Moderate

OEM+

Front: 18x8 +40

Rear: 18x8 +40

Tires: 235/40R18

Low

Fitment note

Final fitment depends on tire model, alignment, suspension height, brake clearance, body tolerance, and intended use. Test fit before committing to permanent changes.