1928 Buick Tire Fitment Guide

1928 Buick vehicles use four sizes across three models. The 1928 Buick 115 Standard uses 31X5.25 and 525-21, while the 1928 Buick 120 Master and 1928 Buick 128 Master use 33X6.00 and 600-21. All of those sizes mount on 21-inch wheels, and available products show rim-width guidance of 2.50 to 4.00 inches where that specification is listed, depending on the tire chosen.

The practical takeaway is that year and make alone are not enough for 1928 Buick tire selection. You first need to identify whether your car is a 115 Standard or one of the Master models, then confirm which of the two matching size conventions is already on the car or appropriate for the restoration. That keeps you from mixing the smaller Standard-family sizes with the larger Master-family sizes.

On a 1928 Buick, 31X5.25 is an antique diameter-by-section marking. The first number, 31, refers to the tire's overall diameter in inches, and the second number, 5.25, refers to nominal section width in inches. For 1928 Buick fitment, that size belongs to the 115 Standard and represents an early tire-labeling system that predates the later numeric style many collectors know better.

That matters because a tire marked 31X5.25 is not being read the same way as a modern radial or even a later alpha-numeric collector size. If your 1928 Buick 115 Standard is being restored with close attention to period-correct appearance, this type of marking may be part of the look you want to preserve. It is still wise to compare the actual wheel and any existing tire markings before making a final choice.

On a 1928 Buick, 525-21 is a numeric bias-ply size. The 5.25 figure is the nominal section width in inches, and 21 is the wheel diameter in inches. Within the 1928 Buick lineup, this size applies to the 115 Standard rather than the Master models, and available products for it come in both blackwall and wide whitewall forms.

The main benefit of understanding 525-21 is that it helps separate a practical buyable replacement size from the older antique-style 31X5.25 notation used on the same model family. If your 1928 Buick 115 Standard already wears 21-inch wheels and you want a reproduction-style bias-ply tire with current product choices, 525-21 is the size code you will usually compare first against your existing setup.

1928 Buick tires are available in both blackwall and wide whitewall styles, depending on size. Size 525-21 includes Firestone blackwall and 3.00-inch whitewall options, along with an Excelsior blackwall offering. Size 600-21 includes Lester blackwall and BFGoodrich blackwall and 3.50-inch whitewall options. All current choices for these sizes are bias-ply tires, which keeps the construction in line with late-1920s practice.

Sidewall choice affects the finished character of a 1928 Buick as much as the tire size itself. A blackwall usually gives the car a more restrained, early-period look, while a wide whitewall can create a brighter presentation that many owners prefer on a restored touring or show car. If authenticity is the priority, compare your intended sidewall style against period photos, factory literature, and the standards used by your Buick club or show field.

Several established collector-tire brands cover 1928 Buick sizes. Firestone and Excelsior offer products in 525-21 for the 115 Standard, while Lester and BFGoodrich offer products in 600-21 for the 120 Master and 128 Master. The available range stays within bias-ply construction, which suits the pre-war Buick market these tires are intended to serve.

Brand choice on a 1928 Buick usually comes down to the exact size you need first, then the sidewall appearance and specification details available within that size. Owners often narrow their options by deciding whether they want blackwall or whitewall presentation and by checking the rim-width guidance shown for the specific tire. That approach keeps the decision practical instead of treating every brand as interchangeable across the whole Buick lineup.

For 1928 Buick 115 Standard fitment in 525-21, Firestone and Excelsior differ in sidewall choices, listed rim-width range, and weight. Firestone offers both blackwall and 3.00-inch whitewall versions with a 2.50 to 3.00-inch rim-width range and a listed maximum load capacity of 1120 pounds at 36 psi. Excelsior's Comp H version is blackwall, weighs less, and is listed for a 3.50 to 4.00-inch rim-width range.

Those differences matter if your 1928 Buick 115 Standard already has a known wheel width or if you are trying to hit a particular visual result. A Firestone whitewall changes the car's appearance immediately, while the blackwall choices keep a plainer period look. Before choosing between them, measure the actual wheel and decide whether sidewall appearance or wheel-width compatibility is the more important part of your project.

Rim-width guidance for 1928 Buick tires depends on the exact size and product. In 525-21, Firestone tires list a 2.50 to 3.00-inch rim-width range, while the Excelsior Comp H in the same size lists a 3.50 to 4.00-inch range. In 600-21, BFGoodrich lists a 3.00 to 3.75-inch rim-width range. All listed 1928 Buick tire sizes mount on 21-inch wheels, but the wheel width still needs to match the specific tire.

That means you should not assume every 21-inch wheel is equally suitable for every 1928 Buick tire option. Two products with the same nominal size can call for different rim-width windows, especially on specialty reproductions. Measuring the wheel before final selection is one of the best ways to avoid fitment surprises, particularly on cars that may have had wheel changes during a long restoration history.

Current 1928 Buick tire offerings shown in 525-21 and 600-21 are bias-ply products, and none are marked as tubeless in the size descriptions. On a pre-war 1928 Buick with 21-inch wire-era or lock-ring-era wheel designs, inner tubes are commonly part of the correct setup. Tube use should still be matched to the exact tire and wheel combination you are running.

The safest approach is to confirm tube requirements against the actual wheel construction and the specific tire's sidewall or manufacturer guidance rather than assuming every reproduction tire is handled the same way. If your 1928 Buick has older wheels that have been restored, repainted, or relined, inspect the wheel condition at the same time. Tube, flap, and valve-stem details should all be treated as part of the overall installation plan.

Original 1928 Buick wheels can only be considered across tire sizes after the model is identified, because all of the listed sizes share a 21-inch wheel diameter but not the same size family. The 115 Standard uses 31X5.25 and 525-21, while the 120 Master and 128 Master use 33X6.00 and 600-21. Diameter compatibility is shared, but width compatibility depends on the exact wheel and the chosen tire's listed rim-width range.

In practical terms, that means a 21-inch Buick wheel is only the starting point. A collector car that has changed hands for decades may have replacement wheels, mixed components, or older restorations that do not reflect the original setup. Before moving between available tire choices, confirm both the wheel diameter and the actual rim width so the tire's mounting requirements line up with the wheel you intend to keep.

A 1928 Buick stores best in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, welders, and other ozone-producing equipment. Bias-ply tires like the ones used on 1928 Buick models are especially prone to flat-spotting during long static periods and can also show age cracking sooner when exposed to heat and ozone. Clean floors, stable temperatures, and proper inflation all help preserve the tire casing.

If the car will sit for months, move it periodically or place it on stands to reduce constant load on one contact patch. That is particularly helpful on a heavy pre-war Buick with tall sidewalls. Avoid storing the car with one side exposed to sun through a window, and check the spare as carefully as the four road tires, since emergency-use tires often age unnoticed for the longest time.

Tire life on a 1928 Buick should be judged more by age and condition than by miles driven. Collector-car tires are often evaluated closely once they reach about five to seven years of service, and many owners treat around ten years as a point where replacement deserves serious consideration even if tread remains. The DOT date code on the tire helps establish age, while cracking, hardening, or persistent air loss are signs that matter just as much.

A lightly driven 1928 Buick can still age out its tires long before it wears them out. That is why low annual mileage should not be taken as proof that an older tire remains suitable for continued use. If the car has been in storage, has uncertain service history, or still wears tires from an earlier restoration phase, a careful age-and-condition review is the right first step before any touring plans.

Tires on a 1928 Buick should be inspected before every drive and again before any extended outing. Look for sidewall cracking, tread separation, bulges, cuts, embedded debris, and signs of uneven wear, and check that each tire is holding pressure consistently. On a pre-war Buick that may use tube-type installation practices, the valve stem area also deserves close attention because tube and stem problems can appear before obvious tread wear does.

Frequent inspection matters because collector cars often go from long idle periods to occasional longer trips without the steady usage pattern that reveals problems gradually. A quick walk-around before a short local drive may catch issues early, while a deeper inspection before a tour helps avoid roadside interruptions. If the car has sat through a season, include the spare and any older tube or flap components in the inspection routine as well.

A 1928 Buick 115 Standard would have been fitted in the bias-ply era, and the size family associated with that model is 31X5.25 and 525-21. Those markings reflect the late-1920s transition between antique-style diameter-by-section nomenclature and later numeric sizing conventions still represented in reproduction collector tires. No specific original-equipment tire brand should be assumed without factory literature or marque-specific confirmation.

For restoration work, that means the most important points are matching the correct Standard-model size family, maintaining bias-ply construction, and choosing a sidewall style that fits the look you want. If the car is being judged, details can vary by body style, market, and event rules. Buick club resources, period brochures, and surviving original cars are the best next references when you want to refine beyond the correct basic size and construction.

Correct tire fitment matters on a 1928 Buick because size, construction type, and sidewall appearance all contribute to how authentic the car looks on the field. A 115 Standard wearing the larger Master-size family, or a Master model wearing the smaller Standard-size family, would look out of scale. Judges and knowledgeable Buick enthusiasts also tend to notice whether a sidewall treatment suits the era and presentation of the car.

That does not mean every event applies exactly the same standard, but it does mean tires should be treated as part of the restoration rather than a last-minute accessory. Matching the correct model-specific size family is the first step, followed by selecting blackwall or whitewall presentation that fits your restoration goal. Before a serious judged event, compare your setup against the event's rules and the expectations of Buick marque specialists.

For 1928 Buick 120 Master and 128 Master fitment in 600-21, BFGoodrich and Lester differ in listed specifications and sidewall offerings. BFGoodrich offers both blackwall and 3.50-inch whitewall versions, lists a 3.00 to 3.75-inch rim-width range, and carries a maximum load rating of 1350 pounds at 36 psi. Lester is offered as a blackwall in the same nominal size, giving Master-series owners another bias-ply option with a different presentation and specification profile.

That comparison matters most when you are balancing appearance against the exact wheel and restoration direction of the car. A BFGoodrich whitewall changes the visual tone of a 1928 Buick Master immediately, while blackwall versions from either brand keep a more understated look. If authenticity for a specific show target is important, choose the sidewall style first, then confirm your wheel falls within the mounting guidance of the exact tire you plan to use.

Bias-ply tires in the sizes used on 1928 Buick models can be suitable for normal road use when they are correctly fitted, properly inflated, and in sound condition. The available 525-21 and 600-21 products listed here do not show separate modern speed ratings in their size markings, so owners should approach highway use with the expectations appropriate to a late-1920s automobile. On a car of this era, braking, steering, suspension condition, and general mechanical health often shape safe cruising confidence as much as the tire itself.

The practical standard is to drive a 1928 Buick within the limits of the car, the road, and the tire's age and condition rather than treating modern traffic speeds as the only benchmark. Fresh, properly maintained bias-ply tires can serve well on tours and local highway use, but they do not behave exactly like modern radials. Smooth inputs, conservative speed choices, and a full pre-drive inspection are the right habits for long-distance planning.

Inflation pressure on a 1928 Buick should follow the vehicle's original specifications first, then be checked against the tire's own rated limits where those are listed. In the currently available products, 525-21 Firestone tires show a maximum load capacity of 1120 pounds at 36 psi, and 600-21 BFGoodrich tires show 1350 pounds at 36 psi. Those figures are load-and-pressure ratings for the tire itself, not a blanket recommendation to run every 1928 Buick tire at that pressure.

That distinction is important because factory operating pressure and tire maximum pressure are not the same thing. A collector Buick may ride, steer, and wear best at pressures different from the tire's upper rated figure, especially when lightly loaded. Start with the owner's manual or factory service literature for the car, then use the tire manufacturer's rating as the outer limit for that specific tire rather than transferring one size's pressure number to another.

Before a longer drive in a 1928 Buick, inspect each tire for cracking, cuts, bulges, tread separation, irregular wear, and proper inflation, and do not forget the spare. Pre-war cars using tube-type installation practices also deserve a close look at valve stems and any signs of air loss around the bead area. The tires are only one part of the preparation, but on a heavy, tall-tire car they are one of the most important places to start.

A longer outing is also the time to think beyond the tires themselves. Check wheel security, steering play, brake feel, and the general mechanical readiness expected of a 1928 Buick before asking the car to spend more time at speed. If the tires are older, have an uncertain age, or came with the car from a previous restoration, a cautious shakedown drive close to home is wiser than making the first test a full-distance tour.