18×8 ET40
Documented Modified1 build
FK RT7M
Tire: 235/45R18
- Suspension
- Not recorded
- Rubbing
- Not reported
- Fender
- Not recorded
18×8 ET40 Wheels on a 2013 Kia Optima
4 documented builds specifically using ET40
Show evidence for this exact wheel size and offset on my vehicle/year. Exact size+offset builds are observational evidence only — not a universal fit, not the “correct” offset, and not a no-rub guarantee.
Evidence summary
- Documented builds using 18×8: 9
- Documented builds specifically using 18×8 ET40: 4
- Axle context: 0 square · 4 staggered · 4 front-only · 0 rear-only · 0 both axles
4 documented 2013 Kia Optima builds in our database use 18×8 ET40 wheels. This is observed use — not a fit confirmation.
Compared with OEM
Aftermarket: 18×8 ET40
Compared with the OEM 17×6.5 ET44 configuration.
Width: +1.5 in
Outer edge 23 mm farther toward fender (more outward poke)
Inner edge 15 mm closer to suspension (less inner clearance)
Geometry is deterministic vs the named OEM baseline. It does not mean the setup fits or will clear.
Tires documented with 18×8 ET40
- 225/45R18 — 2 builds
- 235/45R18 — 1 build
- 225/45R18: -1.3% overall diameter vs selected OEM tire — descriptive only, not a clearance rating.
- 235/45R18: +0.1% overall diameter vs selected OEM tire — descriptive only, not a clearance rating.
Documented tire pairings are not tire recommendations.
Suspension, rubbing, fender, and spacers
Suspension on documented builds
- Not recorded — 4
Reported rubbing
- Rubbing reported: 0
- No rubbing reported: 0
- Not recorded: 4
Fender modifications
- Rolled: 0
- Pulled: 0
- No trimming recorded: 0
- Other trimming label: 0
- Not recorded: 4
Spacer data was not recorded on these exact builds.
Counts are descriptive evidence only — not probabilities or clearance guarantees.
Exact documented builds
Showing 4 of 4 builds matching 18×8 ET40.
18×8 ET40
Documented Modified1 build
MOTEGI Racing MR126
Tire: 225/45R18
- Suspension
- Not recorded
- Rubbing
- Not reported
- Fender
- Not recorded
18×8 ET40
Documented Modified1 build
Revolution Racing RR07
Tire: 225/45R18
- Suspension
- Not recorded
- Rubbing
- Not reported
- Fender
- Not recorded
18×8 ET40
Documented Modified1 build
Enkei Raijin
- Suspension
- Not recorded
- Rubbing
- Not reported
- Fender
- Not recorded
Nearby documented setups
Similar evidence — not the same setup.
Compare this setup with your OEM wheels
Prefills 18×8 ET40 on this vehicle in the fitment calculator.
Related specs
- Bolt pattern: 5x114.3
- Center bore: 67.1 mm
- Thread: M12 x 1.5
- All documented 18×8 offsets for this year
- 2013 Kia Optima OEM wheel fitment
Size and offset evidence does not replace bolt pattern, hub bore, or thread requirements.