325/30R19 Tire Size Guide

The 325/30R19 identifies a metric radial tire size. In that code, 325 is the section width in millimeters, 30 is the aspect ratio, R means radial construction, and 19 is the wheel diameter in inches.

Unlike an older alphanumeric or numeric size, the 325/30R19 spells out its width and profile directly. That makes it easier to compare sidewall height, overall diameter, and possible clearance changes when you are replacing tires or considering an equivalent size. It still does not answer every fitment question by itself, because wheel width, offset, load needs, and the space available around the suspension and fenders all have to be checked on the actual vehicle.

The 325/30R19 fits a 19.0-inch wheel, which is 482.6 millimeters in diameter. The wheel diameter must match exactly, because a 19-inch tire will not seat correctly on any other bead-seat diameter.

Wheel diameter is only part of the fitment picture on a size this wide. Buyers should also confirm the actual wheel width and offset being used, since those details influence sidewall shape, tread placement, and inner and outer clearance. On a low-profile performance size, even a small mismatch in wheel specification can change how the tire sits in the wheel opening and how close it runs to suspension parts or fender edges.

The 325/30R19 has a section width of 325 millimeters, which is about 12.8 inches. That measurement is taken at the widest point of the inflated tire, from sidewall to sidewall.

Section width is not the same as tread contact width, so the part touching the road is usually narrower than the published overall width. For fitment work, section width is the more important number because it is the one most likely to affect fender clearance, suspension clearance, and the amount of room available on the inside of the wheelhouse. On a size as wide as the 325/30R19, those physical checks matter more than appearance alone.

The 325/30R19 has an overall diameter of 26.68 inches, which is about 677.67 millimeters. Overall diameter measures the full height of the tire from the ground to the top when mounted and inflated.

Overall diameter affects more than how the tire looks in the wheel opening. It influences ride height, effective gearing, and speedometer behavior, which is why it is one of the first numbers to compare when looking at substitute sizes. If you move to a noticeably taller or shorter equivalent, the vehicle's stance and clearance can change even when the wheel diameter stays the same. Buyers should compare diameter along with width, not in isolation.

The 325/30R19 has a sidewall height of 3.84 inches, or 97.5 millimeters, on each side of the wheel. That short sidewall comes from pairing a 325 mm section width with a 30-series aspect ratio.

A sidewall this low is part of what gives the size its modern performance character. Shorter sidewalls usually reduce visual sidewall bulk and can sharpen steering response, but they also leave less cushion between the wheel and the road surface. On vehicles driven regularly, that makes wheel condition, suspension health, and alignment especially important. It also means curb impacts and potholes deserve more attention than they would with a taller-profile tire.

The 325/30R19 turns about 755.9 revolutions per mile. That figure comes from the tire's overall circumference and describes how many full rotations it makes over one mile of travel.

Revolutions per mile matter when you compare one size to another, because a meaningful change can affect speedometer and odometer readings. A tire with fewer revolutions per mile is effectively taller, while one with more revolutions per mile is effectively shorter. When evaluating substitutes, use this number together with overall diameter and section width so you can judge stance, gearing feel, and wheel-opening fill rather than relying on the size code alone.

The 325/30R19 is associated with modern performance and low-profile passenger car use. Vehicle references for this size run from 2006 through 2024 and place it in high-performance applications where wide footprint, low sidewall height, and precise wheel fitment are part of the package.

Fitment should still be treated carefully, because a size this wide is often tied to specific wheel widths, offsets, brake packages, and front-or-rear placement. Buyers replacing the 325/30R19 should confirm the exact wheel and chassis setup already on the car, then compare those details against the intended replacement tire. Original owner documentation and current sidewall markings are both helpful when a vehicle has been modified from stock.

The 325/30R19 can serve as a replacement size only when the receiving vehicle has the right 19-inch wheel diameter, enough width and clearance, and load requirements that match the tire being considered. Its 12.8-inch section width and 26.68-inch overall diameter make it a very specific fitment rather than a casual swap.

Replacement decisions should account for more than the wheel diameter shown in the size code. Compare inner clearance to suspension components, outer clearance at the fender lip, wheel offset, and how the tire's diameter will affect stance and speedometer behavior. On performance cars, even small dimensional changes can show up quickly in rubbing, altered proportions, or handling changes, so physical measurement is the safest way to proceed.

The 325/30R19 is a modern radial performance size, so it is usually chosen for contemporary fitment goals rather than for factory-authentic vintage restoration work. Its low 30-series profile and wide section width create a distinctly modern look compared with the taller sidewalls found on most earlier vehicles.

For a build being judged on originality, buyers should confirm whether a modern radial of this profile matches the vehicle's intended era and appearance. Radial construction may improve drivability, but authenticity and drivability are not always the same objective. If the project balances modern road manners with a custom or restomod direction, the 325/30R19 may make sense; if originality is the priority, the visual proportions deserve especially close review.

The 325/30R19 is built around a very wide tread section and a short 3.84-inch sidewall, so it generally favors a more immediate steering response and a firmer road feel than a taller-profile size. Its radial construction also supports the more controlled behavior drivers expect from modern performance applications.

Ride quality depends on more than the size alone. Suspension tuning, wheel width, alignment, inflation, and road surface all shape how the tire feels in service. On a vehicle that already uses a low-profile setup, keeping the original size helps preserve the balance the chassis was designed around. If the vehicle has worn bushings, damaged wheels, or poor alignment, even the correct size can feel harsher or less settled than expected.

The 325/30R19 is a modern radial size commonly associated with current performance-car use, so buyers often choose it for regular road driving as well as spirited use. Its low profile and wide footprint are aimed at maintaining the intended handling character of vehicles designed around this type of fitment.

Highway behavior still depends on the condition of the specific tire, the wheel it is mounted on, alignment settings, and the vehicle's suspension health. Before a long interstate trip, inspect for uneven wear, impact damage, air loss, or age-related cracking, and confirm the tire's load and speed markings on the actual sidewall. A wide, short-sidewall tire asks for closer attention to road hazards and wheel condition than a taller touring size would.

Changing away from the 325/30R19 can alter more than just width. A substitute with a different overall diameter will affect wheel-opening fill, ride height, and revolutions per mile, while a narrower or wider section can change inner clearance, outer clearance, and how aggressive the vehicle looks from the rear.

Drivers should compare overall diameter first, then evaluate sidewall height and section width together. A taller alternative may soften the visual profile and slightly change gearing feel, while a shorter one can leave more wheel gap and increase engine revs at a given speed. Because the 325/30R19 already sits at the low-profile end of the spectrum, small dimensional differences are easier to notice than they would be on a taller sidewall size.

Buyers comparing the 325/30R19 should start with the fundamentals: correct size, radial construction, appropriate load capability for the vehicle, and compatibility with the actual wheel being used. On a size this specialized, accuracy in dimensions and consistency from tire to tire matter as much as brand reputation.

Matched-set consistency is especially important on performance applications. Even when two tires share the same printed size, small differences in section width, shoulder shape, or overall diameter can affect stance and clearance. Review sidewall markings carefully, keep all four tires consistent where the vehicle calls for it, and choose a tire whose construction and intended use line up with the way the car is actually driven rather than focusing on size alone.

Yes, radial construction is central to what the 325/30R19 is. This size belongs to the modern metric radial category, so the construction is part of the tire's expected road manners, sidewall behavior, and overall fitment character.

Construction affects how the tire responds under load, how the sidewall flexes, and how the vehicle feels over pavement changes. For regular road use, many buyers want the drivability associated with a radial. If the vehicle is a judged restoration with authenticity concerns, construction choice may deserve a second look, but on most modern performance applications the more practical goal is preserving the handling balance and visual proportions intended by the original setup.

Full-set consistency matters because the 325/30R19 is a low-profile performance size where differences in tread design, age, wear, or construction can be felt quickly. Mixing unlike tires on the same axle can change steering response, braking behavior, and the way the vehicle tracks over uneven pavement.

A consistent set also helps preserve the visual stance of the vehicle, especially when wide rear sizes are part of the design. Buyers should compare overall diameter, section width, load capability, and sidewall markings across the set rather than assuming every tire labeled 325/30R19 behaves exactly the same. If one tire has been damaged or aged out, replacing in matched pairs is often the more balanced approach for regular road use.

The 325/30R19 should be inspected routinely because its short sidewall and wide footprint leave less margin for neglect than a taller-profile tire. Look for cuts, bulges, punctures, uneven shoulder wear, impact damage, and gradual air loss, especially if the vehicle sees rough pavement or performance driving.

Regular inspection is most useful when paired with alignment and wheel-condition checks. A low-profile size can show the effects of bent wheels, poor toe settings, or worn suspension parts quickly, and those problems often appear as uneven wear before they become obvious in day-to-day driving. Checking condition before long trips and after any hard pothole strike is a practical habit with the 325/30R19.

Tread depth alone does not determine whether the 325/30R19 should stay in service. Tires can age out before they wear out, especially when they are exposed to heat, sunlight, ozone, long periods of inactivity, or repeated impact stress from rough roads.

Owners should inspect the sidewalls and tread area for cracking, hardening, bulges, and irregular wear, then review the tire's age and overall condition before continuing to use it. A performance size may still look presentable while losing the flexibility and structural condition needed for reliable road use. When there is any doubt about age, damage, or unusual wear, a qualified tire professional should inspect the tire before continued driving.

The 325/30R19 is normally a tubeless fitment. Tube use is still a wheel-and-tire-system question rather than a size question, so the final decision should be confirmed against the actual wheel and the specific tire being used.

Modern radial performance sizes like this are generally paired with tubeless wheel setups, but damaged wheels, specialty wheels, or unusual applications can change that evaluation. Buyers should inspect the wheel condition, verify the valve arrangement, and follow the guidance that applies to the exact tire and wheel combination in service. If there is any uncertainty, confirming the setup before mounting is better than assuming the size code answers the question by itself.

The 325/30R19 should be replaced when it shows cracking, bulges, cuts, repeated air loss, impact damage, or uneven wear that points to structural or alignment problems. Replacement can also be necessary when the tire has aged significantly, even if the remaining tread still looks usable.

Performance tires often work under higher cornering and braking demands than ordinary passenger sizes, so condition matters as much as tread depth. Buyers should inspect the tire closely before long trips and after any hard road impact, then review age and service history along with visible wear. If the tire no longer holds air consistently or shows signs of sidewall distress, continued use is a risk that deserves prompt attention.

The most important checks are tire condition, exact 19-inch wheel diameter, adequate clearance, sound wheel condition, and load capability that matches the vehicle's needs. On the 325/30R19, buyers should also pay close attention to sidewall damage and wheel damage because the low profile leaves less cushioning against road hazards.

Roadworthiness depends on the complete wheel-and-tire system, not the size code alone. Confirm that the tire is seated on the correct wheel, inspect for bent rims or prior impact damage, and check for rubbing at full steering lock and through suspension travel where applicable. Reviewing current sidewall markings and having any questionable tire inspected before highway use is a sensible step with a wide performance fitment.

Yes. Buyers should review current sidewall markings, confirm the tire matches the vehicle's load and service requirements, and check any local inspection or road-use rules that apply to the vehicle. The 325/30R19 size by itself does not answer those legal or regulatory questions.

Modified performance cars often raise additional issues involving wheel width, fender clearance, and overall tire coverage, so local standards may matter as much as the printed size. If the vehicle has been altered from stock, verify that the tire and wheel combination still meets practical clearance and use requirements before road driving. When questions remain about suitability or compliance, a qualified tire professional can help evaluate the full setup.