2007 Cadillac SRX — 2WD V8 Sport Package
The 2007 Cadillac SRX 2WD V8 Sport Package came from the factory equipped with 255/50R20 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.
255/50R20
| Section width | 255 mm |
|---|---|
| Aspect ratio (sidewall height) | 50% (127.5 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~30" |
| Revolutions per mile | ~671 |
Compare prices at:
What this size means for your Cadillac SRX
On the 2007 Cadillac SRX 2WD V8 Sport Package, the factory 255/50R20 measures about 30″ in overall diameter with a 127.5 mm (5″) sidewall, and completes roughly 671 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 large-diameter fitment.
On a vehicle of this age, the Cadillac SRX 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 2007 Cadillac SRX trims
- 2WD V6 Base Model 235/65R17 (Front) / 255/60R17 (Rear)
- 2WD V6 Luxury Package 235/65R17 (Front) / 255/60R17 (Rear)
- 2WD V6 Sport Package 255/50R20
- 2WD V8 Base Model 235/60R18 (Front) / 255/55R18 (Rear)
- 2WD V8 Luxury Package 235/60R18 (Front) / 255/55R18 (Rear)
- AWD V6 Base Model 235/65R17 (Front) / 255/60R17 (Rear)
- AWD V6 Luxury Package 235/65R17 (Front) / 255/60R17 (Rear)
- AWD V6 Sport Package 255/50R20
- AWD V8 Base Model 235/60R18 (Front) / 255/55R18 (Rear)
- AWD V8 Luxury Package 235/60R18 (Front) / 255/55R18 (Rear)
- AWD V8 Sport Package 255/50R20
Cadillac SRX tire sizes by year
- 2016 Cadillac SRX 235/65R18 / 235/55R20
- 2015 Cadillac SRX 235/65R18 / 235/55R20
- 2014 Cadillac SRX 235/65R18 / 235/55R20
- 2013 Cadillac SRX 235/65R18
- 2012 Cadillac SRX 235/65R18
- 2011 Cadillac SRX 235/55R20
- 2010 Cadillac SRX 235/55R20
- 2009 Cadillac SRX 235/65R17 (Front) / 255/60R17 (Rear)
- 2008 Cadillac SRX 235/65R17 (Front) / 255/60R17 (Rear)
- 2006 Cadillac SRX 235/65R17 (Front) / 255/60R17 (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.