20×8.5 ET40 Wheels on a 2013 Kia Optima

Evidence summary

• Documented builds using 20×8.5: 18
• Documented builds specifically using 20×8.5 ET40: 7
• Axle context: 1 square · 6 staggered · 7 front-only · 0 rear-only · 0 both axles

7 documented 2013 Kia Optima builds in our database use 20×8.5 ET40 wheels. This is observed use — not a fit confirmation.

Compared with OEM

Aftermarket: 20×8.5 ET40

Compared with the OEM 17×6.5 ET44 configuration.

Width: +2 in

Outer edge 29.4 mm farther toward fender (more outward poke)

Inner edge 21.4 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 20×8.5 ET40

• 245/35R20 — 4 builds
• 235/35R20 — 1 build

• 245/35R20: +1.7% overall diameter vs selected OEM tire — descriptive only, not a clearance rating.
• 235/35R20: +0.6% 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 — 7

Reported rubbing

• Rubbing reported: 0
• No rubbing reported: 0
• Not recorded: 7

Fender modifications

• Rolled: 0
• Pulled: 0
• No trimming recorded: 0
• Other trimming label: 0
• Not recorded: 7

Spacer data was not recorded on these exact builds.

Counts are descriptive evidence only — not probabilities or clearance guarantees.

Nearby documented setups

Similar evidence — not the same setup.

• 20×8.5 ET383 builds · nearby offset
• 20×8.5 ET357 builds · nearby offset
• 20×9 ET353 builds · similar size

Compare this setup with your OEM wheels

Prefills 20×8.5 ET40 on this vehicle in the fitment calculator.

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Related specs

• Bolt pattern: 5x114.3
• Center bore: 67.1 mm
• Thread: M12 x 1.5
• All documented 20×8.5 offsets for this year
• 2013 Kia Optima OEM wheel fitment

Size and offset evidence does not replace bolt pattern, hub bore, or thread requirements.