The 2008 Mazda Trucks CX-9 arrived as a car-based crossover with three-row practicality and a more responsive feel than many traditional SUVs of its time. It appealed to drivers who wanted family space without giving up a more athletic road manner. Tire selection on the 2008 Mazda Trucks CX-9 starts with trim-specific radial fitment, because Grand Touring models use 245/50R20 while Sport and Touring models use 245/60R18. That makes wheel diameter the first checkpoint, followed by the tire's profile and overall presentation. Getting the right size matters for ride quality, clearance, and preserving the way this crossover was intended to sit and drive.
Which Tire Size Is Right for The 2008 Mazda Trucks CX-9
The 2008 Mazda Trucks CX-9 uses two primary tire sizes, and the correct one depends on the specific sub-model and wheel diameter. Both fitments are radial, but they do not share the same rim size, so the first step is confirming whether the vehicle has the 18-inch or 20-inch wheel setup before comparing tire choices.
245/50R20 is a metric radial size in which 245 is the section width in millimeters, 50 is the aspect ratio, R indicates radial construction, and 20 is the wheel diameter in inches. On the 2008 Mazda Trucks CX-9, this size belongs to the 20-inch wheel configuration rather than the 18-inch setup used on other trims. Its lower-profile sidewall gives it a different visual and fitment character than the 245/60R18 alternative. This is the size to evaluate when the vehicle is a Grand Touring model or when the CX-9 is already equipped with 20-inch wheels.
245/60R18 is a metric radial size where 245 identifies the section width in millimeters, 60 is the aspect ratio, R marks radial construction, and 18 is the rim diameter in inches. For the 2008 Mazda Trucks CX-9, this size is used on the 18-inch wheel fitment found on Sport and Touring models. Compared with the 20-inch fitment, it uses a taller sidewall on a smaller wheel diameter. This is the size to confirm when matching tires to an 18-inch wheel setup and the appropriate trim configuration.
Sub-model fitment matters on the 2008 Mazda Trucks CX-9 because tire size changes with trim and wheel diameter. Grand Touring uses a different setup than Sport and Touring, so identifying the exact sub-model is the quickest way to narrow the correct tire size.
1
2008 Mazda Trucks CX-9 Grand Touring
The 2008 Mazda Trucks CX-9 Grand Touring uses the 245/50R20 radial fitment. Tire selection starts with confirming the 20-inch wheel setup, then choosing a replacement that keeps the intended profile and clearance relationship for this trim.
The 2008 Mazda Trucks CX-9 Sport uses the 245/60R18 radial size. That keeps the tire search centered on the 18-inch wheel configuration, making wheel confirmation especially important if the vehicle has had any later wheel changes.
The 2008 Mazda Trucks CX-9 Touring also uses the 245/60R18 radial fitment. Because it shares the 18-inch setup with the Sport model, the main selection step is verifying the actual wheel size currently on the vehicle before replacing tires.
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 2008 Mazda Trucks CX-9 usually center on trim-specific tire size, 18-inch versus 20-inch wheel fitment, and what to inspect before replacing tires on a crossover that may already have aftermarket wheels or suspension changes.
Tire Size & Fitment
What tire size fits a 2008 Mazda Trucks CX-9?
The 2008 Mazda Trucks CX-9 uses two tire sizes: 245/50R20 and 245/60R18. Grand Touring models use 245/50R20, while Sport and Touring models use 245/60R18. Both are radial tire fitments, but they are tied to different wheel diameters and trim levels.
The practical step is to confirm the exact sub-model and the actual wheel size on the vehicle before ordering tires. A CX-9 that has been fitted with different wheels since new may no longer match the original trim-based setup, so checking the current rim diameter is just as important as knowing the badge on the liftgate.
What size rim does a 2008 Mazda Trucks CX-9 use?
A 2008 Mazda Trucks CX-9 uses either an 18-inch or 20-inch rim, depending on the sub-model. Sport and Touring models use the 245/60R18 size on an 18-inch rim, while Grand Touring models use the 245/50R20 size on a 20-inch rim.
Wheel diameter is the first thing to verify because the two CX-9 tire sizes are not built for the same rim. Looking at the sidewall size code on the current tire is a quick check, but it is still wise to confirm the wheel itself if the vehicle has aftermarket rims or a changed trim appearance.
Do all 2008 Mazda Trucks CX-9 sub-models use the same tire size?
No. The 2008 Mazda Trucks CX-9 does not use one tire size across all sub-models. Grand Touring uses 245/50R20, while Sport and Touring use 245/60R18, so the correct fitment depends on the trim and the wheel package on the vehicle.
That difference matters because the two sizes also use different rim diameters. Anyone replacing one or more tires should verify whether the CX-9 still has its original wheel setup, especially if it has changed hands or received wheel upgrades, since trim names alone do not always reflect what is currently installed.
Choosing the Right Tire
What should I consider when choosing a tire for a 2008 Mazda Trucks CX-9?
Start with the correct size for the exact trim and wheel diameter. A 2008 Mazda Trucks CX-9 needs either 245/50R20 or 245/60R18, and those sizes are not interchangeable without checking the wheel setup. Construction is straightforward because both primary fitments are radial.
After size is confirmed, focus on matching the tire to the vehicle's current configuration and intended use. A daily-driven CX-9, a lightly used family vehicle, and one with aftermarket wheels can each call for a different replacement approach, so clearance, wheel condition, and uniform sizing across the axle should all be reviewed.
How do I choose between the available 2008 Mazda Trucks CX-9 tire sizes?
The two available sizes are not alternate choices for the same setup. 245/50R20 belongs to the Grand Touring configuration with 20-inch wheels, while 245/60R18 belongs to Sport and Touring models with 18-inch wheels. The correct choice depends on which wheel diameter the vehicle actually has.
The safest way to narrow it down is to check the sidewall size on the current tires and confirm the wheel diameter directly. That matters even more on used vehicles, because a CX-9 may have been upgraded or downsized over time, and selecting by model name alone can lead to the wrong rim match.
Which tire size should I use for my 2008 Mazda Trucks CX-9 sub-model?
Use 245/50R20 for a 2008 Mazda Trucks CX-9 Grand Touring and 245/60R18 for a 2008 Mazda Trucks CX-9 Sport or Touring. Each size is tied to a specific wheel diameter, so the trim and the rim need to agree before replacement tires are selected.
The most useful double-check is the vehicle's actual wheel and tire combination as it sits today. If the CX-9 has non-original wheels, a prior owner may have changed the size package, so matching the new tires to the installed rim diameter and verifying clearance is more important than relying on trim alone.
Restoration & Appearance
Does correct tire fitment matter for a 2008 Mazda Trucks CX-9 restoration?
Yes. Correct tire fitment helps a 2008 Mazda Trucks CX-9 keep the wheel-to-tire proportions intended for its trim level. Grand Touring uses 245/50R20, while Sport and Touring use 245/60R18, so staying with the proper size helps preserve the crossover's stance and visual balance.
That is especially relevant when the goal is to return the vehicle to a stock-style presentation after years of wheel changes or mixed replacements. Checking the current rims, confirming the correct trim-based size, and avoiding improvised substitutions will do more for appearance and fitment consistency than chasing a generic modern size.
Which tire should I choose for a period-style 2008 Mazda Trucks CX-9?
A period-style approach starts with using the original trim-based size rather than substituting a different wheel diameter. On a 2008 Mazda Trucks CX-9, that means 245/50R20 for Grand Touring or 245/60R18 for Sport and Touring, both in radial construction.
Appearance on a vehicle from this era is shaped more by maintaining the intended size and wheel relationship than by vintage sidewall styling. Anyone aiming for a stock-looking result should confirm the current wheels, avoid mixing tire sizes across the vehicle, and compare the finished stance to reliable vehicle-specific reference photos or owner documentation.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2008 Mazda Trucks CX-9?
Yes. Wheel changes, suspension lowering, spacer use, or non-original offsets can affect tire fitment on a 2008 Mazda Trucks CX-9 even when the tire size itself looks close to stock. That matters because this vehicle already uses two different factory wheel diameters depending on trim.
A modified CX-9 should be checked for wheel diameter, wheel width, steering clearance, and fender clearance before replacement tires are chosen. Sidewall markings tell part of the story, but the actual installed wheel and the vehicle's current ride height are what determine whether the replacement remains compatible in everyday driving.
What should I inspect before driving a 2008 Mazda Trucks CX-9 on new tires?
Before road use, inspect inflation pressure, lug nut torque, valve stems, tread seating, and basic clearance at full steering lock. It is also smart to look over the wheels for bends or damage and make sure the installed tire size matches the CX-9's actual rim diameter.
A short local drive followed by a second inspection can reveal issues early. Listen for rubbing, watch for vibration, and recheck pressure after the tires have settled in, especially on a used 2008 Mazda Trucks CX-9 where wheel changes, uneven wear patterns, or alignment issues may have been present before the new tires went on.
How often should tires on a 2008 Mazda Trucks CX-9 be inspected?
Tires on a 2008 Mazda Trucks CX-9 should be inspected regularly, not just when tread looks worn. Pressure, tread wear pattern, sidewall condition, and any cuts, bulges, or air loss deserve routine attention, particularly on an older crossover that may spend time parked between longer drives.
Monthly visual checks are a sensible habit, and a closer inspection before trips is worthwhile. Uneven wear can point to alignment or suspension issues, while age-related cracking can matter even when mileage is low, so condition should guide service decisions just as much as the tire size printed on the sidewall.
