2006 Infiniti Trucks Tire Fitment Guide

2006 Infiniti Trucks vehicles use three tire sizes across the model range: 265/50R20, 265/60R18, and 265/70R18. The FX35 uses either 265/50R20 or 265/60R18 depending on wheel package, the FX45 uses 265/50R20, and the QX56 uses 265/70R18. That means the full 2006 Infiniti Trucks lineup does not share one universal size.

The practical takeaway is that year and make alone are not enough for this lineup. You need to confirm the model first, and for an FX35, confirm whether the truck has 18-inch or 20-inch wheels. Once wheel diameter and model are verified, the correct tire size becomes much more straightforward and prevents confusion between the FX crossover fitments and the taller QX56 SUV fitment.

On a 2006 Infiniti Trucks tire, 265/50R20 means the tire is 265 millimeters wide, has a 50-series aspect ratio, uses radial construction, and mounts on a 20-inch wheel. Within the 2006 Infiniti Trucks range, that size belongs to the FX35 and FX45. It is the 20-inch FX fitment rather than a size used across the whole lineup.

That code matters because each part affects fitment and stance. A 20-inch rim requirement means it cannot be interchanged with the 18-inch FX35 or QX56 fitments without changing wheels, and the shorter sidewall gives it a distinctly different profile from the taller 18-inch choices. Owners comparing FX models should treat 265/50R20 as the larger-wheel option first and a replacement size second.

No, 2006 Infiniti Trucks models do not all use the same tire size. The FX45 uses 265/50R20, the QX56 uses 265/70R18, and the FX35 can use either 265/50R20 or 265/60R18 depending on its wheel setup. Even though the FX35 and QX56 both have 18-inch options, they are not the same size.

That difference is important because similar-looking numbers can still represent different fitments. A buyer with a QX56 should not assume any 18-inch FX size will substitute, and an FX35 owner should not assume every FX used the same wheel package. Matching the tire to the exact model and wheel diameter is the right starting point before comparing tread design, brand, or driving priorities.

Choosing the right tire size for a 2006 Infiniti Trucks model starts with identifying the model and wheel diameter, not just the year. The FX45 uses 265/50R20, the QX56 uses 265/70R18, and the FX35 can use either 265/50R20 or 265/60R18 depending on configuration. All three are radial sizes, so the main distinction is fitment rather than a bias-ply-versus-radial decision.

That makes the process more about matching the tire to the truck’s existing wheel package and intended factory-style setup. If the vehicle is new to you, check the tire sidewall already on the truck, confirm the wheel diameter directly, and compare front and rear tires in case a previous owner changed them. That simple verification step helps avoid ordering an 18-inch fitment for a 20-inch FX or confusing the QX56’s taller profile with the FX35’s 18-inch option.

A 2006 Infiniti Trucks vehicle should generally run the same tire size at all four corners unless the truck has a confirmed factory or engineered staggered setup. Within this model range, the fitments presented are single-size applications by model or wheel package: 265/50R20, 265/60R18, or 265/70R18. Mixing those sizes without a deliberate wheel and fitment plan can affect ride height, handling balance, and overall appearance.

For most owners, the safest approach is to replace tires in the same size already fitted to the vehicle and keep all four matched. That is especially important on luxury SUVs and crossovers where traction control, ABS behavior, and overall road feel depend on consistent rolling dimensions. If the truck came to you with mismatched tires, treat that as a prompt to verify the correct model-specific fitment before moving forward.

The 2006 Infiniti Trucks sizes covered here are all modern radial fitments: 265/50R20, 265/60R18, and 265/70R18. These sizes belong to the era of tubeless passenger and SUV tire design rather than the older tube-type conventions seen on vintage bias-ply applications. The key fitment concern is matching the tire to the correct wheel diameter and vehicle model.

Even so, wheel condition still matters. If a wheel is damaged, corroded, or has bead-seat issues, that should be corrected before mounting any replacement tire. Owners working with original wheels, aftermarket wheels, or newly acquired vehicles should have the wheel inspected during mounting so the tire, valve stem, and sealing surfaces are all addressed as part of a proper setup.

Original 2006 Infiniti Trucks wheels cannot be treated as universal across all three tire sizes because the lineup uses both 18-inch and 20-inch fitments. The FX35 may use either 18-inch or 20-inch wheels, the FX45 uses a 20-inch fitment, and the QX56 uses an 18-inch fitment with a different profile from the FX35’s 18-inch size. Rim diameter has to match the tire exactly.

That means a 265/50R20 requires a 20-inch wheel, while 265/60R18 and 265/70R18 both require 18-inch wheels. Even when two sizes share an 18-inch diameter, they are still different fitments and should not be swapped casually. If the truck has aftermarket wheels or an uncertain ownership history, confirm the wheel size stamped on the wheel itself before choosing a replacement tire.

A 2006 Infiniti Trucks vehicle stores best on clean, properly inflated tires in a cool, dry, dark space away from direct sunlight, electric motors, welders, furnaces, and other ozone-producing equipment. Long stationary periods can stress any tire, even modern radials, especially on a heavier SUV such as a QX56. Keeping the truck off damp ground and moving it periodically helps reduce flat-spotting and casing stress.

If the vehicle will sit for an extended season, wash the tires, set inflation to the intended storage level, and either roll the truck periodically or support it in a way that reduces constant load. A breathable cover and stable indoor temperatures help preserve both the rubber and the finish on the wheels. Good storage habits matter just as much as tread depth on a collector or low-mileage truck.

Tires on a 2006 Infiniti Trucks vehicle should be judged more by age and condition than by mileage alone, especially on low-use luxury SUVs and enthusiast-owned crossovers. A useful rule is to begin careful age-based evaluation around five to seven years and to treat about ten years as the outer edge for continued service consideration, regardless of remaining tread. The DOT date code on the sidewall gives the tire’s build week and year.

That matters because an older tire can look presentable yet still lose flexibility, grip, and structural integrity over time. A QX56 that sees occasional towing or an FX that spends most of its life parked can both age out their tires before wearing them out. If the truck is newly purchased, checking the date code is one of the quickest ways to understand whether the tires are simply used or genuinely overdue.

Tires on a 2006 Infiniti Trucks vehicle should be inspected before every drive and given a more deliberate check before any longer highway outing. Look for sidewall cracking, punctures, uneven wear, bulges, embedded debris, and any sign that the tire is losing pressure. Because these vehicles are performance-oriented or full-size luxury models, uneven wear can also hint at alignment or suspension issues that should not be ignored.

A quick routine works well: check inflation when the tires are cold, look across the tread for shoulder wear or cupping, and inspect valve stems at the same time. On a vehicle that sits often, repeat that inspection even if mileage is low, since aging and static storage can be as hard on tires as road use. Doing this consistently makes longer drives far less stressful and helps catch problems before they become roadside failures.

2006 Infiniti Trucks vehicles use modern radial tire sizes, and radial construction is well suited to normal highway use when the tires are the correct size, in sound condition, and properly inflated. The fitments here—265/50R20, 265/60R18, and 265/70R18—belong to a modern SUV era rather than an antique or early bias-ply era. Highway safety depends first on condition, age, inflation, and matching the tire to the correct model and wheel diameter.

The practical question is less about whether the size itself can be driven on the highway and more about whether the specific tire on the truck is healthy enough for sustained speed and load. Any 2006-era luxury SUV or crossover should also have brakes, suspension, steering, and alignment in proper order before a long trip. Tires are one part of a system, and the whole system needs to be ready.

Inflation pressure for 2006 Infiniti Trucks tires should follow the vehicle manufacturer’s placard or owner’s manual for the specific model and wheel package, rather than borrowing a number from another Infiniti truck size. The FX35, FX45, and QX56 do not all use the same fitment, and the two 18-inch sizes are not interchangeable pressure references just because they share rim diameter. Pressure should always be matched to the exact vehicle application and tire in use.

That means an FX35 on 265/60R18 should be checked against FX35 guidance, an FX45 on 265/50R20 against FX45 guidance, and a QX56 on 265/70R18 against QX56 guidance. If replacement tires differ from what the truck wore when new, compare the vehicle recommendation with the tire manufacturer’s rated pressure and load information, then set pressure appropriately when cold. Recheck after installation and with seasonal temperature swings.

Before a longer drive in a 2006 Infiniti Trucks vehicle, inspect all four tires and the spare for pressure, tread condition, age cracking, cuts, bulges, and any sign of impact damage. Confirm that the tire size matches the vehicle: 265/50R20 for FX45 and some FX35 applications, 265/60R18 for other FX35 applications, and 265/70R18 for QX56. A mismatch in size or wheel diameter is a problem worth addressing before any trip.

After the tire check, include the broader basics that matter on an older luxury SUV or crossover: brakes, fluids, lights, battery condition, and suspension feel. Long trips also justify checking that the spare is usable and that the jack and tools are present. A careful pre-drive inspection does not take long, but it greatly reduces the chance that a small tire issue turns into a much larger interruption on the road.