Spec Sizes

2020 Honda Civic Si Tire Size

Confirmed OEM tire sizes for this model year. Multiple sizes may apply depending on trim and wheel package — all catalog options are listed.

  • Tire size235/40R18
235/40R18Section width 235 mmSidewall ~94 mm(40% of width)Rim 18"235/40R18235 = width40 = aspectR18 = rim
OEM code 235/40R18: section 235 mm · aspect 40% · rim 18"

All confirmed configurations

SizePositionWidthAspectRimLoadSpeed
235/40R18 (run-flat)Front / all2354018"——