The 2009 Cadillac Trucks SRX came from an era when Cadillac blended luxury-wagon practicality with sport-utility presence, giving the first-generation SRX a distinctive mix of comfort, road manners, and sharp styling. That wide-ranging character shows up in its tire fitment, because this exact model uses several radial tire sizes across different front, rear, and Sport AWD configurations. Sizes span 17-, 18-, and 20-inch rims, so the first step is confirming the exact sub-model and wheel setup before choosing tires. Once that is settled, the decision shifts to selecting the right modern metric radial size for the vehicle's stance, handling balance, and everyday road use.
Which Tire Size Is Right for The 2009 Cadillac Trucks SRX
The 2009 Cadillac Trucks SRX uses five primary tire sizes, and the right one depends on the exact configuration because fitment varies by sub-model and by front or rear position. These are all radial metric sizes, but they are spread across 17-inch, 18-inch, and 20-inch rims. Before choosing a tire, confirm both the specific SRX version and the actual wheel diameter on the vehicle.
255/50R20 is a metric radial size in which 255 is the nominal section width in millimeters, 50 is the aspect ratio, R identifies radial construction, and 20 is the rim diameter in inches. On the 2009 Cadillac Trucks SRX, this size is tied to the Sport AWD configuration and reflects a lower-profile fitment than the 17-inch and 18-inch options. Its broader tread width and shorter sidewall give this setup a more performance-oriented appearance. It is the size to evaluate when the vehicle carries the factory-style 20-inch wheel package and the goal is to preserve that specific look and fitment layout.
235/65R17 is a metric radial size that uses a 235-millimeter nominal section width, a 65-series profile, and a 17-inch rim. On the 2009 Cadillac Trucks SRX, this size appears on the V6 Front position, making it part of a staggered front-to-rear setup rather than a one-size arrangement at all four corners. The taller sidewall gives it a different visual and functional character than the 18-inch and 20-inch alternatives. This is the front size to confirm when the SRX is equipped with the 17-inch wheel package and separate rear tire sizing.
255/60R17 is a metric radial size with a 255-millimeter nominal section width, a 60-series profile, and a 17-inch rim diameter. On the 2009 Cadillac Trucks SRX, it serves the V6 Rear position, pairing with a narrower 17-inch front tire in a staggered setup. That wider rear sizing contributes to the vehicle's intended stance and means tire selection has to follow axle position, not just overall model year and name. It is the rear size to use when the SRX has the 17-inch V6 arrangement and the existing wheel diameter matches this specification.
Fit(s): V6 w/Luxury Performance Pkg. Front and V8 Front
Construction: Radial|Rim: 18 in
235/60R18 is a metric radial tire size where 235 represents nominal section width in millimeters, 60 is the aspect ratio, and 18 indicates the wheel diameter. On the 2009 Cadillac Trucks SRX, this size is used on the front of both the V6 with Luxury Performance Package and the V8 configuration, so it belongs to another staggered setup. Its profile sits between the taller 17-inch front fitment and the lower-profile 20-inch Sport AWD size. This is the front tire size to verify when the vehicle carries 18-inch wheels and either of those specific SRX configurations.
Fit(s): V6 w/Luxury Performance Pkg. Rear and V8 Rear
Construction: Radial|Rim: 18 in
255/55R18 is a metric radial size that combines a 255-millimeter nominal section width with a 55-series profile on an 18-inch rim. On the 2009 Cadillac Trucks SRX, it is used on the rear of both the V6 with Luxury Performance Package and the V8, complementing the narrower 235/60R18 front tire in a staggered arrangement. That means rear tire selection should match the wheel diameter and axle position rather than be treated as interchangeable with the front size. It is the correct rear size to review when the SRX has the 18-inch staggered factory-style setup.
Sub-model fitment on the 2009 Cadillac Trucks SRX is not one-size-fits-all, because tire size changes by trim and, in several cases, by front and rear position. Checking the exact SRX configuration matters here just as much as checking the wheel diameter, especially on staggered setups.
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2009 Cadillac Trucks SRX Sport (AWD)
The 2009 Cadillac Trucks SRX Sport (AWD) uses a single 20-inch radial tire size rather than the staggered front-and-rear layouts found on other SRX configurations. Tire selection here centers on confirming the 20-inch wheel package and choosing a replacement that matches the intended profile and overall presentation of the Sport AWD setup.
The 2009 Cadillac Trucks SRX V6 Front uses a different tire size than the rear, so this configuration should be treated as a staggered setup from the start. Front tire selection needs to stay specific to the front wheel position, with wheel diameter and existing tire layout confirmed before replacement.
The 2009 Cadillac Trucks SRX V6 Rear carries its own dedicated rear tire size, separate from the front axle. That makes it important to verify rear wheel diameter and avoid assuming the front and rear tires can be selected interchangeably on this V6 arrangement.
2009 Cadillac Trucks SRX V6 w/Luxury Performance Pkg. Front
The 2009 Cadillac Trucks SRX V6 w/Luxury Performance Pkg. Front uses an 18-inch radial front tire that differs from the rear size in the same package. Tire choice should follow the front axle specification and the 18-inch wheel setup, especially when replacing only two tires on a staggered vehicle.
The 2009 Cadillac Trucks SRX V6 w/Luxury Performance Pkg. Rear uses a wider 18-inch rear tire than the front. That rear-specific fitment affects replacement planning, so the tire should be selected with the correct axle position and wheel diameter in mind rather than by model name alone.
The 2009 Cadillac Trucks SRX V8 Front shares the same 18-inch front radial size used on the V6 with Luxury Performance Package. The practical step is confirming the vehicle still has its intended staggered 18-inch layout so front replacements stay consistent with the wheel and axle position.
The 2009 Cadillac Trucks SRX V8 Rear uses the matching 18-inch rear size paired with the narrower front tire. Rear tire selection should account for that staggered setup, particularly if wheel changes or prior tire substitutions make the current fitment worth double-checking before replacement.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Frequently Asked Questions
Tire questions for the 2009 Cadillac Trucks SRX usually come down to identifying the correct front or rear size, confirming 17-, 18-, or 20-inch wheel fitment, and understanding how the staggered layouts affect tire replacement and maintenance.
Tire Size & Fitment
What tire size fits a 2009 Cadillac Trucks SRX?
A 2009 Cadillac Trucks SRX can use 255/50R20, 235/65R17, 255/60R17, 235/60R18, or 255/55R18, depending on the exact configuration. The Sport AWD uses 255/50R20, while the V6, V6 with Luxury Performance Package, and V8 setups use staggered front and rear sizes on 17-inch or 18-inch rims.
The key is matching the tire to the exact SRX version and axle position, not just the model year. Front and rear sizes are different on several configurations, so check the wheel diameter, the current tire markings, and whether the vehicle still has its intended wheel package before choosing replacements.
What size rim does a 2009 Cadillac Trucks SRX use?
The 2009 Cadillac Trucks SRX uses 17-inch, 18-inch, or 20-inch rims depending on the sub-model and tire size. The 17-inch setup pairs 235/65R17 front with 255/60R17 rear, the 18-inch setup pairs 235/60R18 front with 255/55R18 rear, and the Sport AWD uses 255/50R20.
Wheel diameter is one of the first things to confirm because these sizes are not all interchangeable across the same vehicle line. A quick check of the sidewall and the actual wheel can prevent ordering the wrong tire, especially on an SRX that may have had wheels changed over time.
Why does the 2009 Cadillac Trucks SRX have more than one tire size?
The 2009 Cadillac Trucks SRX has more than one tire size because fitment changes by configuration and, in several cases, by front and rear position. Cadillac used different wheel packages across the SRX range, including 17-inch, 18-inch, and 20-inch layouts, and some versions use staggered sizing for a wider rear tire.
That means the right choice depends on more than the model name alone. Identifying the exact sub-model, confirming whether the tire is for the front or rear, and checking the actual wheel diameter on the vehicle are the practical steps before selecting a replacement tire.
Choosing the Right Tire
What should I consider when choosing a tire for a 2009 Cadillac Trucks SRX?
Start with the exact size and axle position used on the vehicle, because the 2009 Cadillac Trucks SRX may have a staggered setup with different front and rear tires. All of its primary fitments are radial metric sizes, but they span 17-inch, 18-inch, and 20-inch rims depending on configuration.
After confirming the size, look at how the SRX is used and whether the wheel package remains original to the vehicle. Matching the correct rim diameter and maintaining the intended front-to-rear sizing pattern matter more here than choosing by appearance alone, especially if only two tires are being replaced.
How do I choose between the available tire sizes for a 2009 Cadillac Trucks SRX?
The available tire sizes for a 2009 Cadillac Trucks SRX are not alternatives to mix and match freely; each one belongs to a specific configuration or axle position. The real choice is identifying whether the vehicle is a Sport AWD, a 17-inch V6 setup, or an 18-inch V6 Luxury Performance Package or V8 setup.
Once that is confirmed, use the exact front or rear size that matches the wheel on the vehicle. Checking the existing sidewall markings and wheel diameter is especially important on used SRX models, where previous owners may have changed wheels or replaced tires with a different setup.
How do I choose between the available 18-inch tires for a 2009 Cadillac Trucks SRX?
On a 2009 Cadillac Trucks SRX with 18-inch wheels, the front size is 235/60R18 and the rear size is 255/55R18. Those two sizes work together as a staggered arrangement on the V6 with Luxury Performance Package and the V8, so selection should follow axle position rather than a single all-around fitment.
That matters most when replacing only one pair of tires. Confirm whether the tire is for the front or rear, make sure the remaining tires are compatible with the same overall setup, and check that the vehicle still has its intended 18-inch wheels before choosing replacements.
Restoration & Appearance
Does correct tire fitment matter for a 2009 Cadillac Trucks SRX restoration?
Correct tire fitment matters on a 2009 Cadillac Trucks SRX restoration because the vehicle used different wheel-and-tire combinations depending on configuration. A Sport AWD on 20-inch tires presents differently from a 17-inch V6 or an 18-inch Luxury Performance Package or V8, so the tire size is part of the vehicle's overall stance.
For a restoration-minded project, start by confirming which SRX configuration the vehicle represents and whether it still carries the right wheel diameter front and rear. Originality questions are best checked against build documentation, marque references, or other vehicle-specific records before settling on a final tire setup.
How does tire size affect the appearance of a 2009 Cadillac Trucks SRX?
Tire size has a visible effect on the appearance of a 2009 Cadillac Trucks SRX because the model used several different wheel diameters and profile combinations. A 255/50R20 setup gives the Sport AWD a different visual balance than the taller-sidewall 17-inch arrangement or the staggered 18-inch package.
That means appearance and fitment should be considered together. Matching the correct front and rear sizes helps preserve the intended proportions of the SRX, while a mismatched wheel diameter or incorrect axle sizing can change the vehicle's stance even before any driving differences are noticed.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2009 Cadillac Trucks SRX?
Yes, modifications can affect tire fitment on a 2009 Cadillac Trucks SRX, especially because several factory configurations already use different front and rear sizes. Aftermarket wheels, suspension changes, lowering, or prior tire substitutions can alter the wheel diameter, clearance, or axle-specific sizing that the vehicle was originally set up to use.
A modified SRX should be checked carefully before replacement tires are chosen. Confirm the actual wheel size on the vehicle, inspect clearance at full steering lock and normal ride height, and make sure front and rear sizes still match the intended layout rather than assuming the original configuration is still in place.
What should I inspect before driving a 2009 Cadillac Trucks SRX on new tires?
Before driving a 2009 Cadillac Trucks SRX on new tires, check that the installed sizes match the correct front or rear positions and that the wheel diameters are consistent with the intended setup. It is also smart to inspect inflation pressure, lug torque, tread seating, and basic clearance around the fenders and suspension.
A staggered SRX deserves an extra walk-around after installation because front and rear sizes are easy to confuse. After a short initial drive, recheck pressure, look for any rubbing marks, and make sure the vehicle tracks normally so any setup issue is caught early rather than after longer road use.
How should tires on a 2009 Cadillac Trucks SRX be maintained?
Tires on a 2009 Cadillac Trucks SRX should be maintained with regular pressure checks, routine visual inspection, and attention to wear patterns at all four corners. Because several SRX configurations use staggered front and rear sizes, maintenance starts with making sure each tire remains in the correct position and that tread condition is monitored by axle.
Collector-style low-mile use can still age tires even when tread looks good, so inspect for cracking, bulges, cuts, and air loss over time. Vehicles that sit for long periods also benefit from clean storage conditions and periodic checks before road use, particularly if the SRX is driven only occasionally.
