The 2015 Mazda Trucks CX-9 sits in the three-row crossover segment where family hauling, long-wheelbase comfort, and a more athletic road feel had to work together. For owners today, tire choice matters because it influences not just ride quality and appearance, but also how the CX-9 feels on the road in daily use. This model uses two primary radial tire sizes: 245/60R18 or 245/50R20, depending on sub-model. That creates a straightforward fitment decision centered on wheel diameter first, then on choosing the right tire character within the correct size. For a well-kept CX-9, staying matched to the proper size is the starting point for safe clearance and balanced road manners.
Which Tire Size Is Right for The 2015 Mazda Trucks CX-9
The 2015 Mazda Trucks CX-9 uses two primary tire sizes, and the correct one depends on the specific sub-model and wheel diameter. Both are radial metric sizes, but one fits an 18-inch wheel and the other fits a 20-inch wheel. Before choosing a tire, confirm whether the vehicle is a Sport, Touring, or Grand Touring and verify the wheel size currently on the vehicle, especially if it has been changed from stock.
245/50R20 is a metric radial size that uses a 245-millimeter section width, a 50-series aspect ratio, and a 20-inch rim diameter. On the 2015 Mazda Trucks CX-9, this size is part of the factory-style fitment approach for the Grand Touring and gives the buyer a lower-profile tire format than the 18-inch option. Because it is already a modern radial size, the choice here is less about construction and more about staying with the correct dimensions for the wheel. This size should be selected only after confirming the vehicle is equipped with the proper 20-inch wheel setup.
245/60R18 is a metric radial size with a 245-millimeter section width, a 60-series aspect ratio, and an 18-inch rim diameter. On the 2015 Mazda Trucks CX-9, this size applies to Sport and Touring models, making it the primary fitment for those sub-models. Its modern metric radial format is familiar to current buyers, so the main selection factors are correct wheel diameter, tire category, and maintaining the intended proportions for the vehicle. It is the right size to evaluate when the CX-9 carries the original-style 18-inch wheel package.
Sub-model fitment matters on the 2015 Mazda Trucks CX-9 because tire size changes with trim. Sport and Touring share one size, while Grand Touring uses a different size on a different wheel diameter, so identifying the exact sub-model is the first step before comparing tires.
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2015 Mazda Trucks CX-9 Grand Touring
The 2015 Mazda Trucks CX-9 Grand Touring uses the 245/50R20 radial size, which places it on a 20-inch wheel package rather than the 18-inch setup used on other trims. Tire selection here starts with confirming the existing wheel diameter, then choosing a tire that preserves the intended fitment and clearance.
The 2015 Mazda Trucks CX-9 Sport uses the 245/60R18 radial size. That makes tire selection fairly straightforward as long as the vehicle still carries the proper 18-inch wheels and has not been changed to an alternate wheel package.
The 2015 Mazda Trucks CX-9 Touring also uses the 245/60R18 radial size. For this sub-model, the main task is confirming the wheel setup on the vehicle and then choosing among tires in the correct 18-inch metric radial fitment.
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
Common questions for the 2015 Mazda Trucks CX-9 usually come down to the correct tire size by sub-model, 18-inch versus 20-inch wheel fitment, and what to inspect before putting the vehicle back into regular road use.
Tire Size & Fitment
What tire size fits a 2015 Mazda Trucks CX-9?
The 2015 Mazda Trucks CX-9 uses either 245/60R18 or 245/50R20, depending on sub-model. Sport and Touring models use 245/60R18, while the Grand Touring uses 245/50R20. Both are modern metric radial sizes, but they are tied to different wheel diameters.
The practical takeaway is that tire selection starts with trim level and wheel size, not just the model name on the tailgate. A CX-9 with changed wheels may no longer match its original sub-model fitment, so checking the actual wheel diameter on the vehicle is just as important as checking the badge.
What size rim does a 2015 Mazda Trucks CX-9 use?
A 2015 Mazda Trucks CX-9 uses either an 18-inch rim or a 20-inch rim, depending on sub-model. The 245/60R18 tire fits the 18-inch setup used on Sport and Touring models, while the 245/50R20 tire fits the 20-inch setup used on the Grand Touring.
That difference matters because tire sizes do not cross over between 18-inch and 20-inch wheels. Before replacing tires, confirm the wheel diameter stamped on the wheel or verify the size on the current tire sidewall, especially if the vehicle may have received aftermarket wheels at some point.
Do all 2015 Mazda Trucks CX-9 sub-models use the same tire size?
No. The 2015 Mazda Trucks CX-9 does not use one shared tire size across all sub-models. Sport and Touring models use 245/60R18, while the Grand Touring uses 245/50R20, so fitment changes with trim and wheel package.
That means a tire chosen for one CX-9 sub-model should not be assumed correct for another. Even though the two sizes are close in overall proportions, they mount on different wheel diameters, so the right approach is to confirm the sub-model and inspect the wheels currently installed before purchasing tires.
Choosing the Right Tire
What should I consider when choosing a tire for a 2015 Mazda Trucks CX-9?
Start with the correct primary size for the specific 2015 Mazda Trucks CX-9 sub-model: 245/60R18 for Sport and Touring, or 245/50R20 for Grand Touring. Because both fitments are radial metric sizes, the basic decision is not construction type but selecting a tire in the proper dimensions for the wheel.
After size is confirmed, compare the tire's intended use with how the CX-9 is driven. Daily commuting, highway travel, weather conditions, and ride preferences all matter, but none of that overrides correct fitment. Wheel diameter, overall condition of the suspension, and any past wheel changes should be checked before final selection.
How do I choose between the available 245/60R18 and 245/50R20 tires for a 2015 Mazda Trucks CX-9?
The choice between 245/60R18 and 245/50R20 is determined by the vehicle's wheel package, not personal preference alone. A 2015 Mazda Trucks CX-9 Sport or Touring belongs in the 245/60R18 size, while a Grand Touring belongs in 245/50R20 unless the wheel setup has been changed.
Once the correct size is established, compare tires within that size rather than across sizes. This keeps the focus on the tire that belongs on the wheel already fitted to the vehicle. Checking the sidewall size on the current tires and verifying the actual wheel diameter helps avoid ordering the right tire in the wrong format.
What tire size should I use for my 2015 Mazda Trucks CX-9 sub-model?
Use 245/60R18 for a 2015 Mazda Trucks CX-9 Sport or Touring, and use 245/50R20 for a 2015 Mazda Trucks CX-9 Grand Touring. Those are the primary fitments tied to the sub-model and wheel diameter used on each version.
The easiest way to confirm the right choice is to match three things: the sub-model, the current tire sidewall size, and the wheel diameter on the vehicle. That extra check is worthwhile because a used CX-9 may have received replacement wheels, and trim alone does not always guarantee the wheels are still original to the vehicle.
Restoration & Appearance
Does correct tire fitment matter for a 2015 Mazda Trucks CX-9 restoration or refurbishment?
Yes. Even on a newer collector-leaning vehicle or a well-preserved original example, correct tire fitment helps maintain the intended stance, wheel-to-tire proportion, and overall presentation. For the 2015 Mazda Trucks CX-9, that means staying with 245/60R18 on Sport and Touring models or 245/50R20 on Grand Touring models unless the wheel package has been deliberately changed.
Appearance and fitment work together, especially on a crossover where the wheel opening and tire profile are visually obvious. A refurbishment focused on keeping the vehicle close to its original look should begin with the correct size and wheel diameter, then move on to tire brand, tread character, and general visual style.
How does tire size affect the appearance of a 2015 Mazda Trucks CX-9?
Tire size has a visible effect on how a 2015 Mazda Trucks CX-9 sits and fills the wheel openings. The 245/50R20 fitment used on the Grand Touring presents a lower-profile look on a larger wheel, while the 245/60R18 fitment used on Sport and Touring carries more sidewall on an 18-inch wheel.
That difference is one reason the correct size should match the actual wheel package on the vehicle. Even when two sizes are close in overall diameter, they create a different visual balance. Buyers trying to preserve a trim-specific presentation should confirm both the sub-model and the wheel diameter before replacing tires.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2015 Mazda Trucks CX-9?
Yes. Wheel changes, suspension modifications, lowering, or non-original offsets can affect tire fitment on a 2015 Mazda Trucks CX-9 even when the tire size itself looks close to stock. The main concern is whether the altered setup preserves adequate clearance at the fenders, struts, and steering components.
That is why a modified CX-9 should be checked as an individual vehicle before tire replacement. Confirm the actual wheel diameter first, then inspect for rubbing marks, reduced turning clearance, or altered ride height. A tire that is correct for a stock setup should never be assumed correct for a changed wheel and suspension package.
What should I inspect before driving a 2015 Mazda Trucks CX-9 on new tires?
Inspect the wheels, valve stems, and suspension condition before putting a 2015 Mazda Trucks CX-9 back into regular road use on new tires. Tire pressure should be set properly, and the vehicle should be checked for uneven wear patterns, alignment issues, vibration, or evidence that the previous tires contacted suspension or body components.
A close visual inspection is especially useful on a vehicle that has sat for extended periods or has recently changed hands. Look for cracking on old tires, bent wheels, fluid leaks near suspension parts, and any sign of irregular ride height. Catching those issues early helps the new tires wear evenly and run as intended.
How often should tires on a 2015 Mazda Trucks CX-9 be inspected?
Tires on a 2015 Mazda Trucks CX-9 should be inspected regularly, not just when tread appears worn. A quick visual check for pressure loss, cuts, bulges, cracking, and uneven tread wear is smart before routine driving, and a more careful inspection should be part of scheduled maintenance and seasonal changes.
Consistent inspection matters because age, storage conditions, and curb impacts can affect tire condition long before the tread is gone. It also helps confirm that all four tires still match the correct size for the vehicle's wheel package. On a CX-9, that means keeping an eye on both condition and fitment accuracy over time.
