2009 Hyundai Genesis — Sedan 3.8 Premium Plus
The 2009 Hyundai Genesis Sedan 3.8 Premium Plus came from the factory equipped with 235/50R18 tires. If your vehicle has since been fitted with aftermarket or upsized wheels, your actual tire size may no longer match this factory spec — always confirm against your door placard before buying.
235/50R18
| Section width | 235 mm |
|---|---|
| Aspect ratio (sidewall height) | 50% (117.5 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~27.3" |
| Revolutions per mile | ~740 |
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What this size means for your Hyundai Genesis
On the 2009 Hyundai Genesis Sedan 3.8 Premium Plus, the factory 235/50R18 measures about 27.3″ in overall diameter with a 117.5 mm (4.6″) sidewall, and completes roughly 740 revolutions per mile. Its 50-series aspect ratio gives a balanced everyday-passenger profile — enough sidewall to soak up road shock while keeping steering response crisp. In tire terms it is a passenger (P-metric / Euro-metric) size.
On a vehicle of this age, the Hyundai Genesis may have been refitted with a slightly different replacement size somewhere in its life, so check the current sidewall — not just the factory spec — before buying.
Other 2009 Hyundai Genesis trims
- Coupe 225/45R18 (Front) / 245/45R18 (Rear) / 225/40R19 (Front) / 245/40R19 (Rear)
- Coupe 2.0T R-Spec 225/40R19 (Front) / 245/40R19 (Rear)
- Sedan 3.8 225/55R17 / 235/50R18
- Sedan 4.6 235/50R18
Hyundai Genesis tire sizes by year
- 2016 Hyundai Genesis 225/45R18 (Front) / 245/45R18 (Rear)
- 2015 Hyundai Genesis 225/45R18 (Front) / 245/45R18 (Rear)
- 2014 Hyundai Genesis 225/45R18 (Front) / 245/45R18 (Rear) / 225/40R19 (Front) / 245/40R19 (Rear)
- 2013 Hyundai Genesis 225/45R18 (Front) / 245/45R18 (Rear) / 225/40R19 (Front) / 245/40R19 (Rear)
- 2012 Hyundai Genesis 225/45R18 (Front) / 245/45R18 (Rear) / 225/40R19 (Front) / 245/40R19 (Rear)
- 2011 Hyundai Genesis 225/45R18 (Front) / 245/45R18 (Rear) / 225/40R19 (Front) / 245/40R19 (Rear)
- 2010 Hyundai Genesis 225/45R18 (Front) / 245/45R18 (Rear) / 225/40R19 (Front) / 245/40R19 (Rear)
How to read a tire size
A tire size like 225/45R17 breaks down into three parts:
the first number is the section width in millimeters
(the tire's width from sidewall to sidewall), the second is the
aspect ratio — the sidewall's height as a percentage of
that width — and the number after the "R" is the rim
diameter in inches. A letter prefix (P or LT) indicates
Passenger or Light Truck construction; its absence usually means
Euro-metric sizing.
Some trucks and off-road tires instead use "flotation" sizing, like
37X12.50R17 — here the numbers are the tire's overall
diameter and width in inches directly, with the rim diameter last.
Always verify against the tire information placard on your driver's-side door jamb or your owner's manual before purchasing — tire size can vary by factory option package even within the same trim.