2005 Cadillac CTS — Base Model
The 2005 Cadillac CTS Base Model 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.
225/55R16
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 55% (123.8 mm) |
| Rim diameter | 16" |
| Overall tire diameter | ~25.7" |
| Revolutions per mile | ~783 |
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225/50R17
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 50% (112.5 mm) |
| Rim diameter | 17" |
| Overall tire diameter | ~25.9" |
| Revolutions per mile | ~780 |
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What this size means for your Cadillac CTS
On the 2005 Cadillac CTS Base Model, the factory 225/55R16 measures about 25.7″ in overall diameter with a 123.8 mm (4.9″) sidewall, and completes roughly 783 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 225/55R16 and 225/50R17 roll within 0.2″ (0.8%) of each other in overall diameter, so they are interchangeable from a speedometer standpoint — the second size is an optional wheel package rather than a different rolling size.
On a vehicle of this age, the Cadillac CTS 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 2005 Cadillac CTS trims
- Luxury Package 225/55R16 / 225/50R17
- Luxury Sport Package 225/50R17
- V 245/45R18
Cadillac CTS tire sizes by year
- 2019 Cadillac CTS 245/45R17 / 255/35R19
- 2018 Cadillac CTS 245/45R17 / 245/40R18
- 2017 Cadillac CTS 245/45R17 / 245/40R18
- 2016 Cadillac CTS 245/45R17 / 245/40R18
- 2015 Cadillac CTS 245/45R17 / 245/40R18
- 2014 Cadillac CTS 235/50R18 (Front) / 265/45R18 (Rear) / 235/45R19 (Front) / 265/40R19 (Rear)
- 2013 Cadillac CTS 235/50R18 (Front) / 265/45R18 (Rear) / 235/45R19 (Front) / 265/40R19 (Rear)
- 2012 Cadillac CTS 235/50R18 (Front) / 265/45R18 (Rear) / 235/45R19 (Front) / 265/40R19 (Rear)
- 2011 Cadillac CTS 235/50R18 (Front) / 265/45R18 (Rear) / 235/45R19 (Front) / 265/40R19 (Rear)
- 2010 Cadillac CTS 235/55R17
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.