245/55R17 Tire Size Guide

The 245/55R17 code describes a metric radial tire with three main dimensions built into the size. In this case, 245 means the tire is 245 millimeters wide, 55 means the sidewall height is 55 percent of that width, R means radial construction, and 17 means it fits a 17-inch wheel.

Modern metric sizing gives buyers more direct dimensional information than older alphanumeric or numeric systems. A code like 245/55R17 tells you width, profile, construction, and wheel diameter right away, but it does not by itself confirm wheel width, load suitability, or vehicle clearance. Those still need to be checked against the actual wheel and vehicle setup.

The 245/55R17 fits a 17.0-inch wheel, which is 431.8 millimeters in diameter at the bead seat. That wheel diameter must match exactly, because a 17-inch tire cannot be safely mounted on a wheel of any other diameter.

Wheel diameter is only one part of the fitment picture. Buyers also need to confirm the wheel's width and offset, since those affect how the sidewall sits and how much clearance remains at the strut, fender, and inner wheelhouse. If you are replacing an existing setup, compare the current wheel specifications before changing tire size or profile.

The 245/55R17 has a section width of 245 millimeters, which converts to about 9.65 inches. Section width measures the tire at its widest point from sidewall to sidewall when inflated, not across the tread face.

Tread contact width is usually narrower than section width, so the sidewall bulge is what matters first when checking fitment. Fender lips, spring perches, steering lock, and brake clearances all need to be evaluated against the tire's full sidewall width. On vehicles with tight wheel wells, that outermost section measurement is often the difference between a clean fit and rubbing.

The 245/55R17 has an approximate overall diameter of 27.61 inches, or about 701.29 millimeters. That measurement represents the full height of the mounted and inflated tire from the ground to the top, passing through the center.

Overall diameter affects more than appearance. It influences ride height, wheel-opening fill, and the relationship between road speed and speedometer reading. When comparing the 245/55R17 with another size, diameter is one of the first numbers to study because even a modest change can alter stance, gearing feel, and available clearance at full suspension travel.

The 245/55R17 has an approximate sidewall height of 5.31 inches, or about 134.87 millimeters, on one side of the tire. That figure comes from taking 55 percent of the 245-millimeter section width.

Sidewall height shapes how the tire looks and behaves on the road. A sidewall in this range generally offers more cushion than a lower-profile setup while still keeping a more modern, shorter-sidewall appearance than taller touring sizes. If you are comparing alternatives, sidewall height helps explain differences in ride firmness, wheel-opening fill, and steering response.

The 245/55R17 turns approximately 730.5 revolutions per mile. That figure is based on its calculated circumference of 86.74 inches and gives a useful comparison point when evaluating replacement sizes.

Revolutions per mile matter because they show how often the tire rotates to cover a set distance. If a replacement size turns substantially more or fewer times per mile, speedometer and odometer readings will change along with the effective gearing feel. When comparing the 245/55R17 to another size, this number helps quantify whether the substitute is truly close.

The 245/55R17 is a modern passenger-car radial size and is also seen on some crossover-type applications. Its proportions suit vehicles that need a balance of sidewall height, ride quality, and stable road manners rather than an especially tall or especially low-profile package.

Vehicle fitment should still be confirmed one step at a time. Compare the current tire size, wheel diameter, wheel width, offset, and available clearance before assuming the 245/55R17 is interchangeable with another 17-inch setup. Even when width and rim diameter look familiar, small changes in profile or wheel specification can affect rubbing, steering travel, and stance.

The 245/55R17 can sometimes serve as a replacement comparison point for another 17-inch size, but sharing the same rim diameter does not make two tires interchangeable. Width, overall diameter, and sidewall height all change how the tire sits in the wheel opening and how it behaves on the road.

A careful comparison should include section width, the 27.61-inch overall diameter, and the effect on speedometer readings and clearance. Buyers should also confirm wheel specifications and load needs before substituting. If the vehicle is being judged for originality, the visual profile and construction type may matter too, even when the tire fits physically.

The 245/55R17 combines a 245-millimeter section width with a moderate 55-series sidewall, so both width and height have to work with the actual vehicle and wheel package. Clearance issues can show up at the inner suspension, outer fender lip, or during steering lock and full suspension movement.

Practical fitment work starts with measuring the current setup and comparing it to the replacement tire's section width and overall diameter. Wheel offset and wheel width can change how the same 245/55R17 sits on the vehicle, so two setups with the same tire size may not occupy the same space. Checking those details first helps prevent rubbing and unwanted stance changes.

The 245/55R17 uses radial construction and a 55-series sidewall, so it generally aims for a middle ground between comfort and control. Compared with a taller sidewall tire, it usually feels a bit more direct, while still keeping enough sidewall height to avoid the extra firmness that can come with very low-profile sizes.

Ride behavior also depends on the vehicle's suspension condition, wheel width, inflation setting, and the age of the tires in service. On a well-sorted street vehicle, this size often preserves everyday drivability without pushing the look or feel too far toward either a tall touring profile or an ultra-short performance profile.

A 245/55R17 radial typically delivers more immediate steering response than a taller-profile tire because the sidewall is shorter and flexes less under the same load. The 245-millimeter width also gives the tire a substantial footprint, which can influence steering weight and on-center feel depending on the vehicle.

Steering feel is never created by size alone. Alignment settings, wheel offset, suspension wear, and the actual tire design all shape how the vehicle responds. If you are replacing a different size, compare not only width but also sidewall height and total diameter, since those dimensions work together to influence response, ride quality, and the way the vehicle tracks at speed.

Moving away from the 245/55R17 can change more than appearance. A taller replacement may raise the vehicle slightly and reduce revolutions per mile, while a shorter one may lower ride height and increase engine rpm for a given road speed. Width changes can also affect clearance and steering feel.

Diameter is especially important because the 245/55R17 stands about 27.61 inches tall and turns roughly 730.5 revolutions per mile. Using those figures as comparison points helps predict speedometer change, stance shift, and wheel-opening fill before installation. Buyers should also consider wheel specifications and intended road use instead of comparing by rim diameter alone.

The first priority with the 245/55R17 is matching the size to the vehicle's real needs, not just matching the numbers on the sidewall. Construction type, load suitability, overall diameter, and the intended use of the vehicle all matter when deciding whether a given tire in this size is the right choice.

Quality selection also means looking for consistency across the set. Buyers should compare how accurately the tire preserves the intended stance, whether the wheel and tire dimensions work together properly, and whether the vehicle is being driven daily or maintained with a more appearance-focused goal. A well-matched set usually matters more than chasing one isolated specification.

Yes, because the 245/55R17 is a radial size and radial construction shapes how the vehicle feels in normal road use. Radials generally emphasize stable road manners, more predictable tread behavior, and drivability that suits modern street conditions better than older construction types meant for earlier vehicles.

Construction should still be judged alongside the vehicle's purpose. A regularly driven street vehicle may benefit from the familiar behavior of a radial, while a judged restoration may require closer attention to whether the construction matches the period appearance expected for that build. In either case, the actual size, wheel compatibility, and load needs remain the main decision points.

Using a matched set of 245/55R17 tires helps keep the vehicle's behavior predictable. Even when the size code matches, differences in construction details, overall tire age, and exact dimensions from one tire to another can affect how the vehicle tracks, rides, and responds under braking or cornering.

Consistency matters most when replacing more than one tire or when correcting an uneven setup left by older replacements. Buyers should compare the full set for size match, wear pattern, age, and intended use rather than treating all 245/55R17 tires as identical. Keeping the set uniform reduces surprises in stance, road feel, and maintenance needs over time.

The 245/55R17 should be inspected regularly for cracking, bulges, cuts, uneven wear, and any sign of air loss, especially if the vehicle is driven often or sees highway use. Regular checks matter because radial tires can look serviceable at a glance while still developing wear patterns or age-related condition issues that deserve attention.

Inspection is most useful when it becomes routine rather than occasional. Look across the full tread face, check both sidewalls, and compare wear from one corner of the vehicle to another. Uneven wear can point to alignment, suspension, or inflation issues, and catching those early helps preserve ride quality, tread life, and predictable handling.

The 245/55R17 is normally a tubeless fitment. Tube use is still a wheel-and-tire-system question rather than a size question, so the final answer should always be confirmed against the actual tire and wheel being used.

Modern radial passenger sizes like this are commonly matched with tubeless wheel systems, but exceptions can come from the wheel condition, wheel design, or a specialty application. If there is any doubt, review the sidewall markings on the actual tire, inspect the wheel's bead area and valve setup, and consult a qualified tire professional before assembly.

The 245/55R17 can age even when the vehicle is not being driven, so storage conditions matter. Tires last better when the vehicle is kept away from direct sunlight, excessive heat, standing moisture, and ozone sources such as electric motors or battery chargers that sit nearby for long periods.

Before returning a stored vehicle to the road, inspect each tire closely for flat spotting, sidewall cracking, air loss, and tread distortion. If the car sat for a long interval, a careful check is more important than tread depth alone. Time, storage environment, and inactivity all affect tire condition, even on a vehicle that accumulated very few miles.

The 245/55R17 should be replaced when inspection shows cracking, bulges, cuts, repeated air loss, impact damage, or wear severe enough to affect road use. Tread depth is only one part of the decision, because age and condition can make a tire unsuitable even when some tread remains.

Replacement timing should be based on the tire's actual condition, how the vehicle is used, and whether the tires have been exposed to heat, sun, ozone, or long periods of inactivity. Buyers should inspect before long trips and treat any unusual vibration, pull, or visible sidewall damage as a reason for closer evaluation by a qualified tire professional.

The 245/55R17 is a modern radial passenger size, so it is aligned with the kind of dimensions commonly used on contemporary street vehicles. Suitability for real-world road use still depends on the specific tire's condition, load capability, speed category, and how well the wheel-and-tire package matches the vehicle.

Before regular highway driving or longer trips, buyers should inspect the tires, confirm that all four match the intended application, and review current sidewall markings on the actual tires in service. Suspension condition, alignment, and tire age can affect road behavior just as much as the size itself, so the size code should be treated as only one part of the safety picture.

Buyers should verify wheel diameter first, because the 245/55R17 fits only a 17-inch rim. After that, confirm section width, overall diameter, wheel specifications, clearance at full steering and suspension travel, and the load requirements of the vehicle.

A careful installation check also includes reviewing the actual tire's sidewall markings and making sure the set suits the way the vehicle is driven. Vehicles with tight inner clearance or aggressive wheel offsets can create fitment problems even when the nominal size appears correct. Measuring the current setup before installation is the best way to avoid surprises.