The 2007 Cadillac Trucks SRX came from a period when Cadillac was pushing luxury utility vehicles toward a more athletic, road-focused feel. Its mix of V6 and V8 configurations, available performance-oriented packages, and optional 20-inch wheel setup means tire fitment on this model is more configuration-specific than a single-size lookup suggests. Every primary fitment for the 2007 Cadillac Trucks SRX is radial, but the exact size changes by front or rear position and by wheel package, ranging from 17-inch and 18-inch staggered setups to a 255/50R20 option. The right choice starts with confirming the exact sub-model and wheel diameter, then matching the tire size to the vehicle's intended road use and overall stance.
Which Tire Size Is Right for The 2007 Cadillac Trucks SRX
The 2007 Cadillac Trucks SRX uses five primary tire sizes, and the correct one depends on the exact configuration. Fitment varies by sub-model, front or rear position, and wheel diameter, so the first step is confirming whether the vehicle has the 17-inch, 18-inch, or 20-inch setup before selecting a tire.
255/50R20 is a metric radial size in which 255 identifies the nominal section width in millimeters, 50 is the aspect ratio, R marks radial construction, and 20 is the rim diameter in inches. On the 2007 Cadillac Trucks SRX, this size is tied to the 20-inch option and reflects a lower-profile fitment than the 17-inch and 18-inch combinations. Its overall dimensions give it a distinct role within the SRX lineup, so it should be chosen only after confirming the vehicle actually uses the 20-inch wheel package. That check matters just as much as the size itself.
235/65R17 is a metric radial size with a 235-millimeter nominal section width, a 65-series aspect ratio, and a 17-inch rim diameter. On the 2007 Cadillac Trucks SRX, this size serves the V6 Front position as part of a staggered 17-inch setup rather than a universal four-corner fitment. The taller profile compared with the 20-inch option is part of what distinguishes this configuration, so the buyer should treat it as a position-specific size. Front and rear sizing should always be confirmed together before replacement.
255/60R17 uses a 255-millimeter nominal section width, a 60-series profile, radial construction, and a 17-inch rim. For the 2007 Cadillac Trucks SRX, this size belongs to the V6 Rear position and pairs with 235/65R17 at the front in a staggered arrangement. Its wider section distinguishes the rear fitment and means it should not be treated as a one-size answer for every SRX configuration. Matching the rear tire to the correct front size and verifying the existing wheel setup are the practical keys to getting this fitment right.
Fit(s): V6 w/Luxury Performance Pkg. Front and V8 Front
Construction: Radial|Rim: 18 in
235/60R18 is a metric radial tire size that combines a 235-millimeter nominal section width with a 60-series aspect ratio on an 18-inch rim. On the 2007 Cadillac Trucks SRX, it is used on the front of the V6 with Luxury Performance Package and on the front of the V8 configuration. Because this size is front-specific within an 18-inch staggered setup, it should be selected with the matching rear size in mind rather than as a standalone substitute. Buyers comparing tires here should focus on maintaining the correct front-to-rear relationship for the vehicle's configuration.
Fit(s): V6 w/Luxury Performance Pkg. Rear and V8 Rear
Construction: Radial|Rim: 18 in
255/55R18 is a metric radial size with a 255-millimeter nominal section width, a 55-series profile, and an 18-inch rim diameter. On the 2007 Cadillac Trucks SRX, this size is used at the rear on the V6 with Luxury Performance Package and on the V8 setup, making it the wider half of the 18-inch staggered arrangement. Its role is specific to the rear axle, so choosing it starts with confirming that the SRX actually uses the 18-inch package and matching front size. That helps preserve the intended fitment balance across the vehicle.
Tire fitment for the 2007 Cadillac Trucks SRX varies by sub-model, wheel package, and front or rear position. Checking the exact configuration matters here because the SRX uses multiple staggered setups, and wheel diameter changes along with the tire size.
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2007 Cadillac Trucks SRX (20 Inch Option)
The 2007 Cadillac Trucks SRX (20 Inch Option) uses a dedicated 20-inch radial fitment built around 255/50R20. Tire selection here starts with confirming that the vehicle still wears the 20-inch wheel package and has not been changed to a 17-inch or 18-inch setup.
The 2007 Cadillac Trucks SRX V6 Front uses a 17-inch radial front tire size as part of a staggered arrangement. Replacement should be approached as a front-position fitment, with the rear size confirmed at the same time so the full setup stays consistent.
The 2007 Cadillac Trucks SRX V6 Rear uses the wider rear component of the 17-inch staggered radial setup. Tire choice here should account for the matching front tire size and the actual rear wheel diameter already on the vehicle.
2007 Cadillac Trucks SRX V6 w/Luxury Performance Pkg. Front
The 2007 Cadillac Trucks SRX V6 w/Luxury Performance Pkg. Front uses the front half of an 18-inch staggered radial combination. Selecting a tire for this position means confirming the package-specific 18-inch wheels and pairing it correctly with the rear fitment.
The 2007 Cadillac Trucks SRX V6 w/Luxury Performance Pkg. Rear uses the wider rear size in the 18-inch staggered radial setup. The important step is matching it to the correct front tire rather than treating the rear size as a universal SRX fitment.
The 2007 Cadillac Trucks SRX V8 Front uses the same 18-inch front radial sizing found on the SRX's performance-oriented 18-inch setup. Tire selection should center on confirming the front position and keeping the paired rear size aligned with the vehicle's current wheel package.
The 2007 Cadillac Trucks SRX V8 Rear uses the matching wider rear tire for the 18-inch staggered arrangement. Buyers should confirm the rear wheel diameter and replace it in the context of the complete front-and-rear setup, not as a one-size SRX answer.
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
Questions about 2007 Cadillac Trucks SRX tires usually come down to identifying the exact wheel package and whether the vehicle uses a front-and-rear staggered setup. The FAQs below focus on size fitment, rim diameter, selection strategy, and practical checks before road use.
Tire Size & Fitment
What tire size fits a 2007 Cadillac Trucks SRX?
The 2007 Cadillac Trucks SRX does not use one universal tire size across every configuration. Primary fitments include 255/50R20, 235/65R17, 255/60R17, 235/60R18, and 255/55R18, all in radial construction.
The correct choice depends on the exact sub-model, wheel package, and whether the tire is for the front or rear position. A 17-inch V6 setup, an 18-inch staggered setup, and the 20-inch option each point to different sizes, so the vehicle's existing wheel diameter and front-to-rear arrangement should be confirmed before replacement.
What size rim does a 2007 Cadillac Trucks SRX use?
A 2007 Cadillac Trucks SRX can use 17-inch, 18-inch, or 20-inch rims depending on configuration. The 17-inch setup pairs with 235/65R17 front and 255/60R17 rear, the 18-inch setup uses 235/60R18 front and 255/55R18 rear, and the 20-inch option uses 255/50R20.
Rim diameter is the first thing to verify because the tire size must match it exactly. Once the wheel diameter is confirmed, the next step is checking whether the SRX has a staggered front-and-rear setup, since several configurations use different sizes at each end of the vehicle.
Why does the 2007 Cadillac Trucks SRX have more than one tire size?
The 2007 Cadillac Trucks SRX has more than one tire size because fitment changes with engine configuration, package level, wheel option, and tire position. Some versions use a 17-inch staggered setup, others use an 18-inch staggered setup, and the 20-inch option uses its own dedicated size.
That means tire selection starts with identifying the exact SRX configuration rather than choosing by year, make, and model alone. Looking at the current wheel diameter and checking whether the front and rear tires are different sizes will usually clarify which fitment path the vehicle follows.
Choosing the Right Tire
What should I consider when choosing a 2007 Cadillac Trucks SRX tire?
Start with the exact size and wheel diameter already used on the vehicle, since the 2007 Cadillac Trucks SRX has multiple fitments across 17-inch, 18-inch, and 20-inch wheels. It is also important to confirm whether the vehicle uses the same size at all four corners or a staggered front-and-rear arrangement.
After size is confirmed, compare the tire's role in the setup rather than shopping by dimensions alone. A front SRX tire and a rear SRX tire may differ in width and profile, so matching the intended position, preserving overall fitment balance, and checking the actual wheel setup on the vehicle are the practical priorities.
How do I choose between the available 17-inch, 18-inch, and 20-inch tire fitments for a 2007 Cadillac Trucks SRX?
The 17-inch, 18-inch, and 20-inch tire sizes on a 2007 Cadillac Trucks SRX are not interchangeable choices for a stock vehicle. Each size belongs to a specific configuration, with 17-inch and 18-inch staggered front-rear pairings and a separate 255/50R20 fitment for the 20-inch option.
The decision is less about preference and more about matching the wheel package already on the vehicle. Checking the rim diameter, then confirming whether the SRX uses different front and rear tire sizes, will prevent choosing a size that belongs to another sub-model or another wheel package.
How do I choose between the available rear tire sizes for a 2007 Cadillac Trucks SRX?
Rear tire choice on the 2007 Cadillac Trucks SRX depends on which staggered setup the vehicle uses. A V6 17-inch arrangement uses 255/60R17 at the rear, while the 18-inch Luxury Performance Package and V8 setup use 255/55R18 at the rear.
The practical difference is not simply width, but the complete wheel-and-position relationship. Matching the rear tire to the correct front size and wheel diameter is essential, especially on a vehicle with multiple package-specific configurations. Confirm the existing rear rim size and compare it with the front before replacing a single tire.
Restoration & Appearance
Does correct tire fitment matter for a 2007 Cadillac Trucks SRX restoration?
Correct tire fitment matters on a 2007 Cadillac Trucks SRX because the vehicle was offered with several distinct wheel and tire combinations. Using the wrong diameter or mixing sizes from different configurations can change the vehicle's stance and move it away from the appearance of the original setup it was built to reflect.
A restoration-minded approach starts with confirming whether the SRX has the 17-inch, 18-inch, or 20-inch arrangement and whether it uses staggered front and rear sizing. Owners pursuing a highly exact presentation should also compare the current wheel package against vehicle-specific records and marque references before replacing tires.
How does tire fitment affect the appearance of a restored 2007 Cadillac Trucks SRX?
Tire fitment plays a visible role in how a restored 2007 Cadillac Trucks SRX sits and presents, especially because the model uses different profiles across 17-inch, 18-inch, and 20-inch wheel packages. A lower-profile 255/50R20 setup creates a different visual effect than the taller 17-inch or 18-inch combinations.
Appearance decisions should still begin with the configuration the vehicle is meant to represent. On an SRX with staggered fitment, keeping the correct front-to-rear relationship is part of preserving the intended look, so wheel diameter and position-specific sizing should be checked before cosmetic preferences drive the choice.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2007 Cadillac Trucks SRX?
Yes, modifications can affect tire fitment on a 2007 Cadillac Trucks SRX. Aftermarket wheels, suspension changes, ride-height adjustments, or previous conversions between 17-inch, 18-inch, and 20-inch packages can all alter which tire size is actually on the vehicle today.
That is why the current setup should be inspected rather than assuming every SRX still matches its original configuration. Wheel diameter, front and rear tire sizes, and visible clearance around fenders and steering components are the practical checkpoints before choosing replacement tires for a modified or updated vehicle.
What should I inspect before driving a 2007 Cadillac Trucks SRX on new tires?
Before driving a 2007 Cadillac Trucks SRX on new tires, inspect the wheel diameter, confirm the front and rear sizes are mounted in the correct positions, and verify that inflation is set appropriately for the tire being used. The tread should seat evenly, and there should be no visible rubbing or interference.
A short initial road check is useful for catching issues that are easy to miss while the vehicle is parked. Listen for rubbing during turns, watch for vibration, and recheck tire pressure after the first drive. On an SRX with staggered fitment, position accuracy matters just as much as the tire size itself.
What should I check before a longer drive in a 2007 Cadillac Trucks SRX?
Before a longer drive, the 2007 Cadillac Trucks SRX should have its tire pressures checked, tread and sidewalls inspected for cuts or bulges, and all four tire sizes verified against the vehicle's wheel setup. This is especially important on configurations that use different front and rear tires.
Longer trips put more emphasis on stability and heat management, so aging tires deserve close attention even if they still show good tread. An SRX that sees intermittent use should also be checked for air loss and sidewall cracking, since time and storage conditions can matter as much as mileage on a collector-kept vehicle.
