2014 Buick Regal — Base Model
The 2014 Buick Regal Base Model 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 Buick Regal
On the 2014 Buick Regal Base Model, 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.
Other 2014 Buick Regal trims
- 2.0L Turbo 235/50R18 / 245/40R19
- GS 245/40R19 / 255/35R20
- Premium eAssist 235/50R17 / 235/50R18
Buick Regal tire sizes by year
- 2017 Buick Regal 235/50R18
- 2016 Buick Regal 235/50R18 / 245/40R19
- 2015 Buick Regal 235/50R18 / 245/40R19
- 2013 Buick Regal 235/50R18 / 245/40R19
- 2012 Buick Regal 235/50R18 / 245/40R19
- 2011 Buick Regal 235/50R18 / 245/40R19
- 2004 Buick Regal 225/60R16
- 2003 Buick Regal 225/60R16
- 2002 Buick Regal 225/60R16
- 2001 Buick Regal 225/60R16
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.