2012 Hyundai Genesis — Sedan 3.8
The 2012 Hyundai Genesis Sedan 3.8 shipped with 2 different factory tire sizes, depending on the wheel package it left the factory with (this can also reflect a staggered front/rear setup). Check your tire sidewall or door placard to confirm which one applies to your vehicle.
This trim shipped with more than one tire size (staggered fitment, front/rear, or optional wheel package). Confirm which one matches your vehicle by checking your tire sidewall or door placard.
225/55R17
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 55% (123.8 mm) |
| Rim diameter | 17" |
| Overall tire diameter | ~26.7" |
| Revolutions per mile | ~754 |
Compare prices at:
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 |
Compare prices at:
What this size means for your Hyundai Genesis
On the 2012 Hyundai Genesis Sedan 3.8, the factory 225/55R17 measures about 26.7″ in overall diameter with a 123.8 mm (4.9″) sidewall, and completes roughly 754 revolutions per mile. Its 55-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.
The 225/55R17 and 235/50R18 differ in both width and overall diameter (0.6″, 2.2%), which usually means a staggered front/rear setup — the two sizes are not interchangeable side to side, so match each to its correct axle.
Other 2012 Hyundai Genesis trims
- Coupe 2.0T Base 225/45R18 (Front) / 245/45R18 (Rear) / 225/40R19 (Front) / 245/40R19 (Rear)
- Coupe 2.0T Premium 225/45R18 (Front) / 245/45R18 (Rear) / 225/40R19 (Front) / 245/40R19 (Rear)
- Coupe 2.0T R-Spec 225/40R19 (Front) / 245/40R19 (Rear)
- Coupe 2.0T Track 225/40R19 (Front) / 245/40R19 (Rear)
- Coupe 3.8 Grand Touring 225/45R18 (Front) / 245/45R18 (Rear)
- Coupe 3.8 R-Spec 225/40R19 (Front) / 245/40R19 (Rear)
- Coupe 3.8 Track 225/40R19 (Front) / 245/40R19 (Rear)
- Sedan 4.6 235/50R18
- Sedan 5.0 R-Spec 235/45R19
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)
- 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)
- 2009 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.