2006 Infiniti Q45 Tires

A 2006 Infiniti Q45 does not use one universal tire size across every version. The Base model uses 225/55R17, the Sport uses 245/40R19, and the Premium Package models use 245/45R18. All of these are radial tire sizes, but they correspond to different wheel diameters and different sub-model setups.

The practical step is to confirm the exact sub-model and then verify the wheel diameter currently on the car. A Q45 that has had wheels changed over time may no longer match its original trim-based setup, so checking the tire sidewall and wheel size before ordering helps avoid choosing the wrong fitment.

The 2006 Infiniti Q45 uses three different rim diameters depending on the sub-model: 17-inch, 18-inch, or 19-inch. The Base uses the 17-inch fitment, the Premium Package versions use the 18-inch fitment, and the Sport uses the 19-inch fitment. Each tire size is matched to its corresponding wheel diameter.

Rim diameter is the first thing to confirm because a tire must match the wheel exactly at that point. After that, wheel width still matters, especially when comparing among modern performance-oriented radials, so it is worth checking the actual wheel dimensions if the car has aftermarket wheels or replacement rims.

No, the 2006 Infiniti Q45 changes tire size by sub-model. The Base uses 225/55R17, the Sport uses 245/40R19, and both Premium Package versions use 245/45R18. That means tire fitment is trim-specific rather than shared across the whole Q45 lineup.

This matters because a buyer cannot choose by model name alone and assume the tire will be correct. Checking the trim badge, current wheel diameter, and existing tire sidewall helps narrow the fitment quickly, especially on cars that may have had wheel upgrades, chrome wheel packages, or prior replacement tires installed.

Start with the correct size for the exact sub-model, because the 2006 Infiniti Q45 uses three different radial fitments. After size, the most useful comparisons are wheel-width compatibility, tire series, load figures where stated, and whether the tire is aimed more toward general street use or a more performance-focused driving feel.

Appearance may also influence the choice, especially on the 17-inch Base fitment where blackwall, wide whitewall, and redline-style options are available. On the 18-inch and 19-inch sizes, the selection is more centered on blackwall performance radials, so choosing the right series for the car’s setup becomes more important than sidewall style.

Sidewall style depends on the tire size used by the specific 2006 Infiniti Q45 sub-model. The 17-inch 225/55R17 fitment includes blackwall, wide whitewall, and redline-style choices. The 18-inch 245/45R18 and 19-inch 245/40R19 fitments are represented by blackwall tires in the available product range.

That means the Base model offers the broadest appearance flexibility if the car is being styled with a more distinctive visual treatment. Buyers with Sport or Premium Package cars will usually be choosing among blackwall performance radials, so the decision shifts toward tire series, rim-width range, and the overall character of the available tire options.

BFGoodrich is available across all three 2006 Infiniti Q45 tire sizes, while Nitto appears in the 245/45R18 fitment used on Premium Package models. Within BFGoodrich, the available series include g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and Silvertown Radial in the 17-inch size.

Brand choice should be treated as one part of a larger fitment decision rather than the first decision by itself. It makes more sense to confirm the correct size and wheel setup, then compare the available brand and series options within that fitment based on sidewall presentation, rim-width suitability, and the kind of driving the car actually sees.

A period-style approach starts with keeping the correct trim-based size on the car, since the 2006 Infiniti Q45 used different wheel and tire combinations across Base, Sport, and Premium Package versions. For the Base model’s 225/55R17 fitment, Silvertown Radial options create a more distinctive visual presentation than a typical modern blackwall performance tire.

On Sport and Premium Package cars, the available choices lean toward modern blackwall radial performance series, so maintaining the proper size and wheel diameter becomes the main appearance decision. If exact originality matters, verify trim-specific wheel and tire presentation through marque references or original vehicle documentation before settling on a final visual style.

For a 2006 Infiniti Q45, sidewall style depends on the fitment tied to the sub-model. The 225/55R17 size used on the Base model offers the broadest appearance range, including blackwall, wide whitewall, and redline-style options. The larger 18-inch and 19-inch fitments are represented by blackwall tires in the available selection.

A buyer aiming for a cleaner factory-inspired late-model luxury look will usually stay with blackwall tires. A more personalized or standout presentation may point toward the whitewall or redline-style 17-inch choices, but that only applies when the car uses the Base model’s wheel and tire size rather than one of the larger trim-specific fitments.

Yes, modifications can change how a tire fits on a 2006 Infiniti Q45 even when the size looks close on paper. Aftermarket wheels, altered wheel widths, different offsets, suspension changes, or lowering can all affect clearance at the fender, steering components, and suspension. That is especially important on the Q45 because the factory fitments already vary by wheel diameter.

A modified car should be checked for actual wheel size and available clearance before a replacement tire is chosen. It is also smart to compare the existing tire size on the vehicle against the intended trim-based fitment so a previous owner’s changes do not lead to ordering a tire that matches the badge but not the car’s current setup.

Before road use, inspect the wheel condition, confirm that the tire size matches the correct sub-model setup, and make sure each tire is mounted on the proper rim diameter. It is also worth checking inflation pressure, valve stems, and wheel balance so the new tires start out with the right basic support and operating conditions.

A quick walkaround should also include looking for suspension wear, uneven old tire wear patterns, rubbing marks, and any interference near the inner fender or steering stops. On a luxury sedan like the Q45, those checks help the car ride and track as intended and can reveal underlying chassis issues before they shorten tire life.

Tires on a 2006 Infiniti Q45 should be inspected regularly, not just when tread looks worn. A monthly visual and pressure check is a sensible habit, along with a closer inspection before longer trips or after the car has been stored for a while. That schedule helps catch air loss, irregular wear, cracking, cuts, or impact damage early.

Cars that are driven infrequently still need attention because age and storage conditions can affect tire condition even when mileage stays low. Looking at the tread shoulders, sidewalls, and inner clearance areas is especially useful on vehicles with low-profile fitments, since ride-impact damage or rubbing can develop without becoming obvious from a casual glance.