2024 Cadillac Tire Fitment Guide

2024 Cadillac vehicles use ten sizes across two models. The CT4 uses 225/45R17, 235/35R19, 235/40R18, 255/35R18, and 275/35R18, while the CT5 uses 245/45R18, 255/35R20, 245/40R19, 275/35R19, and 305/30R19. Rim diameters span 17, 18, 19, and 20 inches, and rim width ranges vary by size where published, from 7.0-8.5 inches on some 225/45R17 products up to 9-11 inches on some 275-width applications.

The practical takeaway is that year and make alone are not enough for a 2024 Cadillac tire decision. You need the exact model, then the exact size already on the car, especially on staggered or performance-oriented wheel packages. Checking the size on the sidewall and confirming the wheel diameter before choosing a tire will keep you from crossing CT4 and CT5 fitments that may look similar at a glance but are not interchangeable.

On a 2024 Cadillac, 225/45R17 is a metric radial size. The 225 is the tire’s nominal section width in millimeters, 45 is the aspect ratio, meaning the sidewall height is 45 percent of the section width, R identifies radial construction, and 17 is the wheel diameter in inches. In this year-and-make range, that size belongs to the CT4.

That code matters because each part affects both fitment and the car’s stance. A 17-inch tire cannot be mounted on an 18- or 19-inch wheel, and a different section width or aspect ratio can alter overall diameter and clearance. When a 2024 Cadillac CT4 calls for 225/45R17, staying with that exact size is the best starting point unless you are intentionally changing the full wheel-and-tire package with a clear plan.

No. The 2024 Cadillac CT4 and 2024 Cadillac CT5 use different size groups, and every size here is tied to one model or the other rather than shared across both. The CT4 ranges from 17-inch through 19-inch fitments, while the CT5 ranges from 18-inch through 20-inch fitments and also includes wider 19-inch rear-style sizes such as 305/30R19.

That means a 2024 Cadillac owner should identify the model before doing anything else. Even if two sizes seem close in width, the wrong diameter or profile can create mounting issues or change the car’s intended balance. If the car has been upgraded with optional wheels, compare the sidewall size and the actual wheel diameter together so you match the tire to the setup that is on the car now.

Most 2024 Cadillac sizes here are offered in Blackwall form, which matches the contemporary look expected on modern Cadillac sport sedans. The exception is 305/30R19 for the CT5, where Blackwall, RWL, and Redline choices appear. That gives the widest CT5 19-inch fitment more visual variety than the rest of the lineup.

For a stock-appearing 2024 Cadillac, Blackwall is usually the most natural choice because it aligns with current luxury-performance styling. RWL and Redline options on 305/30R19 are more about visual emphasis than factory-style restraint, so they make the most sense for owners leaning into a custom or more expressive presentation. If appearance matters as much as fitment, choose the sidewall style at the same time you confirm the exact size.

2024 Cadillac tire coverage here comes from BFGoodrich, Nitto, and Pro-Trac, depending on size. BFGoodrich appears across nearly the entire range, Nitto covers many of the same performance-oriented metric radial sizes, and Pro-Trac appears in 305/30R19 with alternate sidewall looks. Brand availability changes by size, so the exact fitment on the car determines how many choices you will have.

That brand spread gives most 2024 Cadillac owners more than one path within the correct size. Some sizes, such as 245/40R19, stay within BFGoodrich options, while others open the door to both BFGoodrich and Nitto, and the widest CT5 fitment adds Pro-Trac styling alternatives. Once the size is settled, comparing the available series within that size is more useful than comparing brands in the abstract.

On overlapping 2024 Cadillac sizes, both are modern radial performance tires, but the exact specifications can differ by size. In 235/40R18, for example, the BFGoodrich g-Force Phenom T/A carries a 95Y speed rating, while the Nitto NT555 G2 carries a 95W rating; in 275/35R18, the BFGoodrich also reaches 99Y while the Nitto is 99W. Published load figures and rim width ranges are often close, but the speed-rating ceiling can change from one series to the other.

For a 2024 Cadillac owner, that means the decision is less about broad brand loyalty and more about the exact size and spec set that best suits the car’s use. If you want to compare two products seriously, look at the speed symbol, load figure where shown, sidewall appearance, and approved rim width range for that specific size. That approach gives you a cleaner comparison than assuming all tires in the same size behave the same way.

Approved rim width ranges vary by size on 2024 Cadillac applications. Examples include 7.0-8.5 inches for some 225/45R17 products, 8.0-9.5 inches for 235/40R18 and 245/40R19, 8.5-10.0 inches for 255/35R18 and 255/35R20, 7.5-9.0 inches for 245/45R18, and 9-11 inches for 275/35R18 and 275/35R19. A few products omit a published rim width range, so the tire should still be matched to the wheel on the car carefully.

Rim width matters because the same tire size can behave differently when stretched onto a narrow wheel or pulled onto a wheel at the wide end of its approved range. Before choosing a replacement for a 2024 Cadillac, confirm the actual wheel width as well as the tire size. That is especially important on lower-profile 18-, 19-, and 20-inch packages where appearance and handling are closely tied to wheel-and-tire proportions.

These 2024 Cadillac fitments are modern radial sizes, and the product markings do not indicate tube-type construction. The sizes use contemporary ZR-format radial sizing and fit modern passenger-car wheel diameters from 17 to 20 inches, which aligns with tubeless passenger tire practice. Nothing in these fitments points toward an inner-tube requirement as part of normal installation.

For most owners, the better setup check is the condition of the wheel and valve stem rather than tube selection. If a 2024 Cadillac has aftermarket wheels, make sure the wheel condition, bead seat, and valve hardware are appropriate for the tire being mounted. When in doubt, confirm the tire’s sidewall marking during installation so the wheel, tire, and service parts all match the intended use.

No, because 2024 Cadillac sizes do not all share one wheel diameter. The range includes 17-, 18-, 19-, and 20-inch fitments, so each tire must match the wheel diameter exactly. Even among the 18-inch or 19-inch groups, section width and approved rim width ranges differ enough that one size should not be treated as a universal substitute for another.

Original wheels can be used with the tire size they were built to accept, but not across the entire 2024 Cadillac lineup. A CT4 on 17-inch wheels needs a 17-inch tire, and a CT5 on 20-inch wheels needs a 20-inch tire. If the car has staggered sizing or optional wheels, verify front and rear sizes separately before replacing anything so you do not assume the same fitment is used at all four corners.

A 2024 Cadillac should be stored in a cool, dry, dark space away from direct sunlight, ozone sources such as electric motors or welders, and standing moisture. Keep the tires properly inflated during storage and move the car periodically if possible so one part of the tread is not carrying the load for months at a time. Modern radials tolerate storage better than older bias-ply designs, but they still age from heat, light, and inactivity.

For longer layups, clean the tires, avoid petroleum-based dressings, and consider stands or slight repositioning if the car will not move for an extended period. A 2024 Cadillac with low-profile performance tires can develop cosmetic flat-spot feel after sitting, even when the tires are otherwise healthy. Good storage habits protect the sidewalls and help the car return to smooth road manners more quickly when it goes back into use.

On a 2024 Cadillac, tire life should be judged by age and condition as much as mileage. A common collector and enthusiast guideline is to begin evaluating tires closely around five to seven years of age and to treat roughly ten years as a serious replacement threshold, even if tread remains. The DOT date code on the sidewall is the key reference point for age.

That matters because many performance-oriented cars cover modest annual mileage yet still spend long stretches parked. A 2024 Cadillac may wear its tires slowly in terms of tread but still age them through heat cycles, storage conditions, and calendar time. If the tire shows cracking, impact damage, bulges, or persistent vibration, condition should override mileage-based thinking and move the inspection or replacement timetable forward.

Tires on a 2024 Cadillac should be inspected before every drive and again before any longer highway outing. Look for visible cracking, cuts, punctures, uneven wear, bulges, and pressure loss, and pay extra attention to the shoulders on wide low-profile sizes where curb contact can happen more easily. Valve stems should also be checked for age or damage.

Frequent inspection is especially worthwhile on cars with staggered performance fitments, because front and rear tires may not wear the same way and often cannot be rotated in a simple pattern. A quick walk-around takes very little time and can catch a problem before it becomes a roadside issue. For a 2024 Cadillac that sees irregular use, pressure checks are just as important as visual checks because slow air loss may go unnoticed between drives.

Yes, these 2024 Cadillac fitments are modern radial performance tires with speed ratings that commonly include W and, on some products, Y. W corresponds to a ceiling of 112 mph, while Y corresponds to a ceiling of 186 mph. Those figures are well beyond ordinary U.S. highway speeds, so the tires themselves are not the limiting factor in normal road use when they are in good condition and properly inflated.

The more meaningful safety questions are condition, inflation, alignment, and whether the exact size matches the wheel on the car. A 2024 Cadillac is capable of higher-speed stability than many older collector cars, but tire age, prior damage, and neglected pressures can still undermine that advantage. For real-world driving, the correct size in sound condition matters more than chasing the highest speed symbol available.

Inflation pressure on a 2024 Cadillac should follow the vehicle’s factory recommendation first, because that reflects the car’s weight distribution, suspension tuning, and intended use. Some tire products in these sizes also publish load figures at 50 or 51 psi, such as 1,477 pounds at 50 psi for certain 225/45R17 and 255/35R18 applications, 1,709 pounds at 50 psi for some 275/35R18 products, and 1,764 pounds at 50 psi for some 245/45R18 and 275/35R19 products. Those figures are tire capacity references, not a universal pressure setting for every 2024 Cadillac.

Use the door-jamb or owner’s manual recommendation as your normal starting point, then confirm that the chosen tire is suitable for the car’s required load and wheel package. Do not transfer a pressure figure from one size to another just because the sizes look related. On low-profile 2024 Cadillac fitments, even small pressure errors can affect ride quality, steering response, and edge wear, so checking cold pressure regularly is worthwhile.

Before a longer trip in a 2024 Cadillac, inspect all four tires for cracking, cuts, punctures, bulges, exposed cords, and uneven wear, then verify cold inflation pressure and confirm that the spare or mobility setup is ready. Look closely at the sidewalls and inner shoulders on wider low-profile sizes, because damage there is easier to miss. If the car has staggered sizes, make sure front and rear positions still match the intended setup.

Tires are only one part of the pre-drive routine, but they are an easy place to catch trouble early. A longer outing is also a good time to check wheel torque, brake feel, and any vibration that might point to impact damage or an out-of-balance tire. On a 2024 Cadillac, proper preparation is less about vintage-era fragility and more about making sure a modern high-performance sedan is still being supported by healthy, correctly matched tires.