2020 Audi Tire Fitment Guide

2020 Audi vehicles use 21 distinct tire sizes: 225/40R18, 235/35R19, 225/50R17, 245/40R18, 245/35R19, 245/45R18, 255/35R19, 245/45R19, 255/40R20, 255/35R21, 245/45R20, 255/45R19, 265/40R20, 275/35R21, 245/30R20, 295/35R19, 305/30R20, 255/30R19, 265/30R20, 265/35R21, and 255/30R20. They span 17-, 18-, 19-, 20-, and 21-inch rim diameters, and each size fits only certain models rather than the entire 2020 Audi range.

A3, A3 Quattro, and S3 share 225/40R18 and 235/35R19, while A4-family, A5-family, A6/A7, A8/S8, TT models, and the R8 each follow their own fitment patterns. Some cars also use multiple wheel packages or staggered front-and-rear sizing. The safest approach is to confirm the exact model and the tire size already mounted on the car, then compare that against the wheel diameter you plan to keep.

On a 2020 Audi, 225/40R18 is a metric radial tire size. The 225 is the nominal section width in millimeters, 40 is the aspect ratio showing the sidewall height as 40 percent of the width, R means radial construction, and 18 is the wheel diameter in inches. That size appears on the A3, A3 Quattro, and S3.

Reading the code correctly helps prevent one of the most common mistakes on modern Audis: confusing a tire that shares a similar width with one that fits a different wheel diameter or profile. A 225/40R18 cannot substitute for a 235/35R19 without a wheel change, even though the numbers look close at a glance. Always match the full size code, not just the width.

No. 2020 Audi uses model-specific sizing across its lineup, and even closely related cars may share some sizes while differing in others. The A4 and A4 Quattro share 225/50R17, 245/40R18, and 245/35R19, while the A6 Quattro and A7 Sportback share 245/45R19, 255/40R20, and 255/35R21. Models such as the A4 allroad, A6 allroad, RS3, and R8 also use sizes that are unique to those applications.

That means year and make alone are not enough for accurate tire selection on a 2020 Audi. A buyer needs the exact model, and on many cars the wheel package matters as well. Performance models may also use staggered front-and-rear sizes, so checking all four tires before replacement is wise rather than assuming a square setup.

Most 2020 Audi tire sizes here are available in blackwall form, which is the standard modern appearance for contemporary Audi sedans, wagons, coupes, and sports cars. The notable exception is 305/30R20 for the R8, where blackwall, RWL, and redline sidewall treatments are available. That makes the R8 rear 20-inch fitment the only size in this group with visible sidewall-style variety.

For a factory-style look on a 2020 Audi, blackwall is usually the natural choice because it matches the understated OEM appearance typical of the brand in this era. RWL and redline options are more personalized visual statements and make the most sense when the goal is custom styling rather than stock presentation. If originality matters, compare the sidewall look against the car’s intended presentation before deciding.

2020 Audi fitments here are covered by BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac, though brand availability depends heavily on the size. BFGoodrich and Nitto cover many of the mainstream 17-, 18-, 19-, and 20-inch fitments, M&H Racemaster appears in 245/40R18, and Pro-Trac appears in 305/30R20. Some sizes have only one brand choice, while others have two or three.

The practical takeaway is to choose the size first, then see which brands exist within that exact fitment. Buyers with common A3, A4, A5, and A6-family sizes often have the broadest brand coverage, while highly specialized performance sizes can narrow quickly. Once the size is settled, compare speed rating, sidewall appearance, and rim-width compatibility rather than assuming every brand covers every Audi application.

For 245/40R18 on a 2020 Audi, BFGoodrich and Nitto both offer blackwall radial choices, but the spec details are not identical. BFGoodrich includes W- and Y-rated versions in this size, with rim-width ranges of 8.0 to 9.5 inches and load ratings up to 1,609 pounds at 50 psi on some versions. Nitto’s NT555 G2 in the same size is W-rated to 112 mph, fits 8.0 to 9.5 inches with an 8.5-inch measuring width, and carries a 1,609-pound maximum load at 50 psi.

That means a 2020 Audi owner comparing 245/40R18 options should look beyond brand name and focus on the exact speed rating, the wheel width on the car, and the kind of driving the car actually sees. If the wheel sits near the edge of the approved width range, that fitment detail matters. Matching the tire’s intended use to the car’s role will usually be more important than small weight differences.

Several 2020 Audi sizes carry defined rim-width ranges. 225/40R18 fits 7.5 to 9.0 inches, 225/50R17 fits 6.0 to 8.0 inches, 245/40R18 fits 8.0 to 9.5 inches on most versions with one 8.5-inch specific drag radial, 245/35R19 fits 8.0 to 9.5 inches, 245/45R18 fits 7.5 to 9.0 inches, 255/35R19 fits 8.5 to 10.0 inches, 245/45R19 fits 7.5 to 9.0 inches, 255/40R20 fits 8.5 to 10.0 inches, and 245/45R20 fits 7.5 to 9.0 inches.

Those ranges matter because modern Audi handling and tire wear are sensitive to wheel width. A tire can be the correct nominal size yet still be a poor choice if the wheel sits outside the approved range for the product you want. Before choosing a tire, compare your wheel width against the approved span for that exact size and product rather than relying on size code alone.

The modern radial sizes used on 2020 Audi applications are tubeless in character, and at least some products explicitly carry TL markings. You can see that in sizes such as 245/40R18 and 245/45R20, where certain BFGoodrich versions show XLTL in the size marking. No tube-type markings appear in these 2020 Audi fitments.

For most buyers, that means the focus should be on wheel condition, bead-seat cleanliness, and valve-stem condition rather than planning for inner tubes. If you are replacing only one or two tires, make sure the wheel is suitable for a tubeless radial and that the valve hardware is in equally good shape. On a modern Audi, an air-loss problem is far more likely to involve the wheel or valve than a tube requirement.

A 2020 Audi should be stored on clean, properly inflated tires away from direct sunlight, standing moisture, and ozone sources such as electric motors, welders, battery chargers, or air compressors. Modern radials generally tolerate storage better than older bias-ply designs, but they still age from heat, UV exposure, and long periods of static load. If the car will sit for extended periods, move it occasionally or use stands when appropriate for the overall storage plan.

That routine helps reduce flat-spotting, sidewall stress, and cosmetic cracking, especially on lower-profile 19-, 20-, and 21-inch fitments. A covered, climate-stable garage is far better than outdoor storage, even if the car is driven only occasionally. If your Audi is a seasonal car, include tire pressure checks as part of the storage checklist rather than assuming the tires will hold the same pressure for months.

On a 2020 Audi, tire life should be judged by age and condition as much as by tread depth. A good collector and enthusiast rule is to begin careful evaluation around five to seven years of age and to treat roughly ten years as the point where replacement deserves serious consideration, even if the tires have low mileage. The DOT date code on the sidewall is the best way to verify the tire’s actual age.

That matters because many 2020 Audi cars, especially second or weekend vehicles, can age out their tires before they wear them out. High-performance compounds and low-profile sizes can also harden with time, changing ride and grip even when the tread looks usable. If you are buying a used Audi, checking the date code should happen before any spirited driving or long trip planning.

Tires on a 2020 Audi should be inspected before every drive and more carefully before any extended highway trip. Look for sidewall cracking, punctures, cuts, bulges, uneven shoulder wear, and any sign that the tire is losing pressure. On wider or lower-profile Audi fitments, also inspect the wheel lip for impact damage because curb or pothole contact can affect both the rim and the tire bead area.

Frequent inspection is especially important on performance-oriented Audis because low-profile tires can transmit more impact load into the wheel assembly. A slow leak, damaged inner shoulder, or bent rim can go unnoticed until vibration or handling changes become obvious. Catching those issues early protects the tire, improves ride quality, and helps you avoid choosing a replacement before the real cause is found.

Yes, the radial tires used on 2020 Audi applications are suitable for highway use when they are the correct size, in good condition, and operated within their speed and load ratings. Many sizes carry W-rated products with a 112 mph ceiling, while some BFGoodrich versions in sizes such as 235/35R19, 245/45R18, 255/35R19, 245/45R19, 255/40R20, and 245/45R20 carry Y ratings for 186 mph and above. Real-world safety still depends on condition, inflation, alignment, and the car’s overall mechanical state.

On a modern Audi, the tires are only one part of the highway equation. Suspension wear, brake condition, and impact-damaged wheels can affect stability just as much as the tire itself, especially on large-diameter low-profile packages. If the car feels nervous, pulls, or vibrates at speed, treat that as a full vehicle inspection issue rather than assuming the size code alone is the problem.

Inflation pressure for a 2020 Audi should follow the vehicle placard or owner’s manual for normal service, because factory pressure targets are vehicle-specific. Tire products in these sizes carry their own maximum load-and-pressure figures, including 1,235 pounds at 51 psi for one 225/40R18, 1,653 pounds at 50 psi for one 225/50R17, 1,609 pounds at 50 psi for some 245/40R18 versions, 1,764 pounds at 50 psi for some 245/45R18 versions, and 1,929 pounds at 50 psi for one 245/45R20.

Those maximum-pressure figures are load-rating references, not blanket everyday pressure recommendations for every 2020 Audi. The right running pressure depends on the exact model, front-versus-rear weight distribution, and intended operating load. Use the car’s factory recommendation as the baseline, then confirm that the tire you choose is appropriate for the required load rather than transferring a pressure number from another size.

Before a longer drive in a 2020 Audi, inspect all four tires and the spare if the car carries one. Check for cracking, punctures, cuts, bulges, uneven wear, and any sign of prior impact damage near the bead or sidewall. Confirm cold inflation pressure, verify that lug hardware is secure, and make sure no tire on a staggered setup has been accidentally rotated into the wrong position.

That inspection should sit alongside a broader mechanical review that matches the car’s performance level and age. Brake condition, alignment, wheel condition, and fluid status all matter on an Audi that may use very low-profile 19-, 20-, or 21-inch tires. Spending a few minutes on a careful walk-around can prevent a roadside issue and helps you catch a wheel or tire problem before it turns into a vibration or failure.