2017 Cadillac Tire Fitment Guide

2017 Cadillac vehicles use 13 tire sizes across four model lines. ATS uses 225/45R17, 225/40R18, 255/35R18, and 275/35R18; CT6 uses 235/50R18, 245/45R19, 245/40R20, and 265/45R18; CTS uses 245/45R17, 245/40R18, 255/35R19, 265/35R19, 295/30R19, and 275/35R18; XTS uses 245/45R19 and 245/40R20. Wheel diameters span 17, 18, 19, and 20 inches, so there is no single tire size that fits every 2017 Cadillac model.

That range makes model identification the first step, followed by checking the wheel diameter already on the car. Rim width guidance also changes by size where it is available, such as 7.0 to 8.5 inches for some 225/45R17 applications, 9.0 to 11.0 inches for some 275/35R18 applications, and 8.0 to 9.5 inches for some 245/40R20 applications. If your Cadillac has optional wheels or staggered sizing, compare the sidewall marking on each tire before replacing anything.

On a 2017 Cadillac, 225/40R18 is a metric radial size code. The 225 is the nominal section width in millimeters, 40 is the aspect ratio, R means radial construction, and 18 is the wheel diameter in inches. On this year Cadillac, that size belongs to the ATS and mounts on an 18-inch wheel.

Understanding that code helps you avoid mixing up tires that may look similar but fit very differently. A 225/40R18 has a shorter sidewall than a 225/45R17, even though both begin with the same section width. If your ATS uses 18-inch wheels, the 225/40R18 keeps you in the correct diameter class; if it uses 17-inch wheels, moving to an 18-inch size would require the correct wheel as well as the correct tire.

No. 2017 Cadillac models do not share one universal tire size. A few sizes overlap between models, including 275/35R18 for ATS and CTS, 245/45R19 for CT6 and XTS, and 245/40R20 for CT6 and XTS, but most sizes are model-specific. CTS alone uses six sizes, while XTS uses only two.

That means year and make are only the starting point. If you own an ATS or CTS, there may be more than one correct size depending on wheel package, and if you own a CT6 or XTS, the distinction between 19-inch and 20-inch wheels changes the tire entirely. The most reliable approach is to identify the model first, then confirm the exact sidewall code currently mounted on the car before choosing a replacement.

Most 2017 Cadillac tire sizes on this page are available in Blackwall form, which suits the clean, contemporary look expected on modern Cadillac sedans. The notable exception is 245/40R20, which also appears with an RWL raised white letter sidewall through Pro-Trac. That means sidewall style variety exists, but it is limited to certain sizes rather than spread evenly across the entire 2017 Cadillac range.

For a factory-like appearance on ATS, CT6, CTS, or XTS, Blackwall is usually the natural visual match. An RWL tire adds a more aggressive, custom look that may appeal to an enthusiast build but changes the car's appearance immediately. Sidewall style does not replace the need to match the correct size, so confirm the exact wheel diameter and tire code first, then decide whether you want a subtle original-style presentation or a more expressive visual treatment.

2017 Cadillac tire coverage on this page comes from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac. BFGoodrich and Nitto appear across many of the ATS, CT6, CTS, and XTS sizes, while M&H Racemaster appears in 245/45R17 and 245/40R18, and Pro-Trac appears in 245/40R20. Brand availability depends on size, so the brand choice for a CTS on 19-inch wheels is not the same as the brand choice for an ATS on 17-inch wheels.

That size-by-size variation matters because it shapes both appearance and intended use. A buyer comparing 245/40R20 choices for CT6 or XTS can weigh BFGoodrich, Nitto, and Pro-Trac, while a buyer in 255/35R19 for CTS stays within BFGoodrich offerings. Start with the exact size on your Cadillac, then compare the available tire series within that size instead of assuming every brand covers every 2017 Cadillac application.

For several 2017 Cadillac sizes, BFGoodrich g-Force Sport COMP-2 and Nitto NT555 G2 sit in the same general category of modern radial performance tires, but their details differ by size. In 225/40R18, both fit 7.5 to 9.0-inch rims, while the Nitto shows a 1,389-pound maximum load at 50 psi and the BFGoodrich shows 1,235 pounds at 51 psi on the examples here. In 275/35R18, the Nitto covers 9.0 to 11.0 inches with a 1,709-pound maximum load at 50 psi, while the BFGoodrich example shows 1,521 pounds at 51 psi and a narrower 9.00 to 9.50-inch rim range on one version.

The practical takeaway is to compare the exact size, load figure, and rim-width compatibility rather than choosing only by brand name. Two tires with the same sidewall size can still differ in wheel-width tolerance and load capacity. If your Cadillac uses factory wheels, confirming the wheel width helps narrow the better match; if the car has aftermarket wheels, that check becomes even more important before settling on one tire series over another.

Rim-width guidance for 2017 Cadillac tires changes significantly by size. Examples include 225/40R18 at 7.5 to 9.0 inches, 255/35R18 at 8.5 to 10.0 inches on some products, 225/45R17 at 7.0 to 8.5 inches on some products, 275/35R18 at 9.0 to 11.0 inches on some products, 235/50R18 at 6.5 to 8.5 inches, 245/45R19 at 7.5 to 9.0 inches, 245/40R20 at 8.0 to 9.5 inches, 245/45R17 at 7.5 to 9.0 inches, 245/40R18 at 8.0 to 9.5 inches, 255/35R19 at 8.5 to 10.0 inches, and 265/35R19 at 9.0 to 10.5 inches on one product.

Those ranges show why wheel width matters almost as much as wheel diameter. A tire may fit the diameter of your Cadillac wheel but still fall outside the ideal width window for that rim. Before choosing a tire, check the wheel width stamped on the wheel or confirm it with a trusted shop. That becomes especially important on cars with optional wheel packages or aftermarket wheels, where the tire size on the car may not tell the whole story.

Original 2017 Cadillac wheels can only be reused across sizes that share the same rim diameter, and even then, width still needs to be confirmed. A 17-inch wheel can only accept a 17-inch tire, an 18-inch wheel can only accept an 18-inch tire, and the same rule applies to 19- and 20-inch combinations. Shared sizes such as 245/45R19 for CT6 and XTS or 275/35R18 for ATS and CTS show diameter compatibility between those applications, but not universal interchangeability across the whole model range.

That means you should not assume a tire from one 2017 Cadillac model can move to another simply because both are sedans from the same year. Wheel width and the car's specific package still matter. If you are replacing tires on factory wheels, confirm the sidewall size already mounted and compare it with the wheel diameter. If you are restoring a car to stock appearance or correcting a prior owner's changes, check the wheel first before ordering tires.

A stored 2017 Cadillac should be kept away from direct sunlight, standing moisture, and ozone sources such as electric motors, battery chargers, and welders. Tires last better in a cool, dry, dark environment, and the car should be moved periodically or supported in a way that reduces long static loading if it will sit for long stretches. These 2017 Cadillac applications are all radial tires, which generally tolerate storage better than older bias-ply designs, but they still age from time, environment, and inactivity.

Good storage habits preserve both appearance and ride quality. Keep the tires properly inflated during storage, clean away road contaminants, and inspect the sidewalls before returning the car to service. If your Cadillac is a low-use collector or weekend car, making storage part of routine care is often more important than counting miles. A car that looks lightly driven can still have aging tires if it has spent years parked in warm, bright, or ozone-rich conditions.

Tires on a 2017 Cadillac should be judged primarily by age and condition, not just mileage. A common collector and enthusiast standard is to begin evaluating tires closely around five to seven years of service and to consider replacement as they approach ten years, even if tread depth still appears usable. The DOT date code on the sidewall gives the tire's manufacturing week and year, which is the best baseline for age-related decisions.

That matters because many ATS, CT6, CTS, and XTS cars are now old enough that original-era replacement tires may already be beyond their safest service life. Cracking, hardening, vibration, or repeated pressure loss can all signal that age is becoming the limiting factor. If a 2017 Cadillac is driven occasionally rather than daily, low mileage can create a false sense of security, so inspect by calendar age first and treat tread wear as only one part of the picture.

Tires on a 2017 Cadillac should be inspected before every drive and again before any longer trip. Look for sidewall cracking, cuts, punctures, irregular tread wear, bulges, and signs of pressure loss, and confirm that all four tires match the intended size arrangement for the car. Because these Cadillacs use modern low-profile radial sizes in many applications, even small pressure changes can affect ride quality and wear more noticeably than on taller-profile tires.

A quick inspection routine helps catch problems before they become roadside issues. Check pressure when the tires are cold, look at the inner sidewalls when possible, and do not forget the spare if the car still carries one. Cars that sit for weeks between outings deserve extra attention because flats, slow leaks, and age cracking often appear during storage intervals rather than during steady daily use.

A 2017 Cadillac ATS was originally built around modern radial tire sizes, not antique, numeric, or bias-ply formats. Within the ATS range, the fitments here are 225/45R17, 225/40R18, 255/35R18, and 275/35R18, all of them radial sizes intended for contemporary wheel diameters and modern suspension tuning. The exact size depends on the wheel package and configuration of the car rather than on a single universal ATS specification.

For an authenticity-minded owner, the goal is to match the size and visual character the car was meant to wear, especially if the ATS is being preserved in factory style. Blackwall tires are the natural appearance for this era. If there is any doubt about how your specific ATS left the factory, the safest route is to confirm the original wheel and tire package from the car's own labels or with a Cadillac marque specialist rather than relying on memory or another owner's setup.

Correct tire fitment does matter when showing a 2017 Cadillac, especially if the goal is factory-correct presentation rather than a modified enthusiast look. Judges and knowledgeable observers will notice whether the car wears the right size family, the correct wheel diameter, and a sidewall style that suits the period. On a modern Cadillac from 2017, a contemporary Blackwall radial usually looks appropriate, while a raised white letter tire can shift the car toward a custom or performance-styled presentation.

Authenticity is not just about whether the tire bolts on; it is about whether the overall look matches the model and era. An XTS on an incorrect low-profile size or an ATS on the wrong wheel diameter can look out of character even if the tire physically fits. If you plan to enter marque or preservation events, compare your car against original factory specifications and event rules, since each judging standard may place different emphasis on tires and wheels.

On several 2017 Cadillac sizes, BFGoodrich g-Force COMP-2 A/S and BFGoodrich g-Force Phenom T/A share the same basic radial size but differ in some published details. In 225/40R18, both are Blackwall radials, but the Phenom T/A shows a 1,389-pound maximum load at 50 psi while the COMP-2 A/S example does not carry the same published load figure here. In 245/40R20, both fit an 8.0 to 9.5-inch rim range, while the Phenom T/A adds a 1,709-pound maximum load at 50 psi and carries a Y speed rating rather than W.

For a buyer focused on authenticity, the key point is that both remain visually modern Blackwall radials appropriate to a 2017 Cadillac, but they are not identical in specification. Comparing the exact load figure, speed symbol, and fitment details within your size is worthwhile before making a final choice. That is particularly important on performance-oriented CTS applications or larger CT6 and XTS wheel packages, where the details of the tire's published specification can influence which version makes the most sense.

The 2017 Cadillac tire sizes on this page are modern radial tires, and many carry W or Y speed ratings. W indicates a ceiling of 168 mph, while Y indicates a ceiling above that threshold; several sizes such as 275/35R18, 245/45R19, 245/40R20, 245/40R18, 255/35R19, and 265/35R19 include Y-rated options alongside W-rated ones. At ordinary highway speeds, those ratings are well above normal U.S. driving conditions when the tires are in sound condition and properly inflated.

Real-world safety depends on more than the speed symbol alone. Tire age, pressure, wheel condition, alignment, suspension wear, and brake condition matter just as much on a luxury or performance Cadillac. A newer radial with the right load and speed rating is only part of the equation, so treat tire selection as one piece of the car's overall roadworthiness. Before a sustained highway trip, make sure the tire condition matches the capability suggested by the sidewall.

Inflation pressure on a 2017 Cadillac should follow the vehicle manufacturer's recommendation for the car and the tire maker's guidance for the specific tire. Some of the tires here include maximum load and pressure references, such as 1,389 pounds at 50 psi for one 225/40R18, 1,709 pounds at 50 psi for one 275/35R18, 1,874 pounds at 50 psi for one 245/45R19, and 1,709 pounds at 50 psi for one 245/40R20. Those figures are tire capacity references, not universal vehicle inflation settings.

The practical rule is simple: use the Cadillac door-jamb or owner's-manual recommendation as your starting point, then verify that the tire itself is suitable for that use. Do not transfer a pressure figure from one size to another, and do not inflate to the maximum shown on the tire unless the application specifically calls for it. On low-profile 17- through 20-inch fitments, even a few pounds of error can affect ride, wear, and steering response.

Before a longer drive in a 2017 Cadillac, inspect all four tires for cracking, cuts, bulges, punctures, uneven wear, and cold inflation pressure. Confirm that the tires match the car's intended size arrangement, especially on CTS applications where multiple 17-, 18-, and 19-inch fitments exist, and make sure the spare is present and usable if the car carries one. A visual check of the wheels for damage is also worthwhile on low-profile applications.

That tire inspection should sit alongside a broader mechanical check that suits a modern Cadillac now moving into enthusiast ownership. Brake condition, fluid levels, battery health, and suspension condition can matter just as much as the tire itself once you are on the road. If the car has been parked for a while, the first drive should be treated as a recommissioning exercise rather than a routine trip, even if the tread still looks fresh at a glance.