1926 Locomobile Tire Fitment Guide

1926 Locomobile vehicles use four sizes across three models. The Locomobile 48 and Locomobile 90 use 33X6.75 and 700-21, and both of those senior-car sizes mount on 21-inch rims. The Locomobile Jr. 8 uses 30X5.77 and 30x5, which belong to its own antique-size family and mount on different wheel diameters from the senior cars.

That means year and make alone are not enough for a confident tire choice on a 1926 Locomobile. Start by identifying the exact model, then confirm the wheel diameter on the car before settling on a tire size. If you own a 48 or 90, the decision is between two 21-inch bias-ply fitments; if you own a Jr. 8, stay within the two sizes associated with that model rather than assuming senior-car tires will cross over.

On a 1926 Locomobile, 33X6.75 is an antique diameter-by-section designation. The first number, 33, is the overall tire diameter in inches, and the second number, 6.75, is the nominal section width in inches. That differs from later sizing systems that emphasize rim diameter in the code itself, even though this senior Locomobile fitment still mounts on a 21-inch wheel.

Buyers usually encounter this format when working with pre-war luxury and touring cars. It helps preserve the tall, substantial profile expected on a large 1920s automobile, and it should be matched carefully to the correct model family. If your car is a 48 or 90, this size belongs in the conversation; if it is a Jr. 8, it does not. Antique-format sizes reward careful wheel and model verification before any purchase decision.

No, 1926 Locomobile models do not all use the same tire size. The 48 and 90 share the senior-car sizes 33X6.75 and 700-21, while the Jr. 8 uses 30X5.77 and 30x5. That split reflects the difference between Locomobile's larger luxury models and its smaller junior offering rather than a single make-wide fitment standard.

The practical takeaway is simple: identify the model before comparing tires. A senior Locomobile owner can focus on the 21-inch fitments and then decide which of those suits the car's intended presentation, while a Jr. 8 owner should stay within the two smaller antique-size choices tied to that model. Looking only at the year and make can send you into the wrong tire family, especially on a marque with both senior and junior cars in the same season.

For a 1926 Locomobile 48 or 90, both 33X6.75 and 700-21 are bias-ply senior-car fitments on 21-inch rims, but they belong to two different sizing conventions. The 33X6.75 designation reflects the older diameter-by-section style, while 700-21 uses the later numeric width-and-rim format. Only the 700-21 size currently offers a broad range of brand and sidewall choices, including Blackwall, Wide Whitewall, and Double-Whitewall versions.

That makes the choice less about one being universally better and more about how you want the car to present. If you are working toward a distinctly early pre-war appearance, the antique-format size has strong appeal. If you want more flexibility in sidewall treatment and a clearer product selection, 700-21 is the easier path to compare. The right answer depends on the exact wheels on your car and the style direction of the restoration.

For 1926 Locomobile fitments, the currently offered sidewall styles appear in the 700-21 senior-car size. That size is available in Blackwall, Wide Whitewall, and Double-Whitewall form. Those choices let an owner shape the visual character of a Locomobile 48 or 90, from a restrained touring look to a more formal whitewall presentation that suits many restored luxury cars of the late 1920s.

Sidewall style matters most when the car is being restored with a particular period look in mind. Blackwall often reads as more understated and utilitarian, while whitewall treatments bring more visual emphasis to the wheel opening and can better match a formal luxury-car aesthetic. If your 1926 Locomobile is judged in marque or period classes, check the expectations for your body style and market before deciding which whitewall treatment, if any, belongs on the car.

The available 1926 Locomobile product range in 700-21 includes Firestone and Michelin. Firestone appears in the Balloon series with multiple sidewall treatments, while Michelin appears in the Double Rivet line in Blackwall form. Both are offered in bias-ply construction, which is appropriate to the period character of a 1920s Locomobile senior model.

Brand choice on a pre-war car often comes down to the look you want and the exact product specifications that fit your wheels. Firestone gives the broadest cosmetic range in this size, especially if whitewall appearance matters to the finished car. Michelin adds another period-appropriate name and a different fitment envelope within the same nominal size. Compare the rim-width range and sidewall style first, then narrow the field by the presentation you want from the completed restoration.

For 1926 Locomobile tires in the available 700-21 size, rim-width requirements vary by product. Firestone Balloon versions call for 3.75 to 4.00-inch rims, while the Michelin Double Rivet version fits 3.00 to 3.75-inch rims. All of those 700-21 products mount on 21-inch wheels, but the acceptable rim-width range is not identical from one brand or series to another.

That difference matters because a tire can share the same nominal size yet be intended for a narrower or wider wheel. Before choosing among 700-21 options for a 1926 Locomobile 48 or 90, measure the wheel or confirm it against a known specification for the car. Matching the tire to the actual rim width helps preserve proper profile, bead seating, and appearance. It also prevents choosing a product simply by sidewall style without checking whether the wheel supports it.

The two senior 1926 Locomobile sizes, 33X6.75 and 700-21, both belong to the 21-inch wheel family. That means a Locomobile 48 or 90 owner can often evaluate both sizes against the same wheel diameter rather than treating them as completely separate wheel systems. The shared diameter is the starting point, not the entire answer.

Rim width still needs to be checked before making the jump from one size choice to the other. The available 700-21 products alone span more than one rim-width range, which shows why diameter by itself is not enough. If the car retains original wheels, confirm the actual width and condition of those rims before choosing a tire. That is especially important on a heavy pre-war luxury car where the visual stance and proper tire profile both matter.

A 1926 Locomobile should be stored in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, and other ozone sources that age rubber. Keep the tires clean, maintain proper inflation, and move the car periodically so the same footprint does not sit in one place for months at a time. Bias-ply tires are more prone than radials to temporary flat-spotting during long static storage, so regular repositioning helps.

If the car will be parked for an extended season, many collectors either roll it occasionally or support it in a way that reduces constant load on the tires while still protecting the suspension and chassis correctly. Moisture on concrete and prolonged exposure to sunlight will shorten tire life even on a car that sees very few miles. A little storage discipline does more for an occasional-use Locomobile than chasing mileage-based wear limits.

On a 1926 Locomobile, tire age usually matters more than tread wear because most collector cars are driven sparingly. A good rule is to evaluate tires closely once they reach roughly five to seven years of age and to consider replacement as they approach ten years, even if the tread still looks respectable. The DOT date code, when present on modern reproduction tires, is the simplest way to track age.

A heavy pre-war car can put serious demands on old rubber even at moderate speeds, so visible tread depth should not be your only decision point. Sidewall cracking, hardening, vibration, and persistent air loss deserve attention sooner than the calendar limit if they appear. Owners who use a 1926 Locomobile only for tours, shows, and short weekend drives should still think in terms of rubber age and storage history, not just miles driven since installation.

Tires on a 1926 Locomobile should be inspected before every drive and again before any longer outing. Look for sidewall cracking, cuts, bulges, uneven wear, and signs that the tire has been run underinflated or has shifted on the rim. On an older collector car, it is also wise to pay close attention to valve stems and the condition of the spare, since those are often overlooked until the day they are needed.

Frequent visual checks fit the way a pre-war car is actually used: infrequently, but with higher stakes when it does go out on the road. A brief walk-around takes only minutes and can catch aging problems that would not show up in mileage-based service schedules. If the steering suddenly feels heavier, the car develops a pull, or ride quality changes, inspect the tires again before assuming the issue is purely mechanical.

A 1926 Locomobile 48 would have been fitted in the bias-ply era, and its associated sizes here are 33X6.75 and 700-21. Both belong to period-correct pre-war sizing systems, with the former using antique diameter-by-section notation and the latter using numeric width-and-rim notation. Original-equipment branding could vary by market, body style, and delivery history, so the key authenticity markers are size family, construction type, and correct era appearance rather than assuming one universal brand.

For a careful restoration, start by checking the wheels on the specific car and any surviving factory or coachbuilder records tied to that chassis. Marque clubs, period sales literature, and long-time Locomobile specialists can help sort out whether a given 48 should present with one size convention or the other. That approach is more reliable than choosing a tire only by what looks plausible, especially on a high-end American car where details contribute heavily to authenticity.

Correct tire fitment matters a great deal when a 1926 Locomobile is judged for authenticity. Size, construction type, and sidewall appearance all influence whether the car reads as properly restored for its period. On a formal pre-war luxury car, a tire that is visibly too modern in profile or sidewall treatment can stand out quickly, even to non-specialists, because the tire contributes so much to the car's stance.

Judging standards vary by event, so it is smart to confirm what your show or club expects before settling on a final tire. Some venues focus mainly on overall era correctness, while others examine construction and sidewall details more closely. If your 1926 Locomobile is being prepared for serious concours use, consult event rules and marque resources early. That helps avoid redoing the tire decision after the car is otherwise complete and ready for presentation.

For a 1926 Locomobile in 700-21, Firestone Balloon and Michelin Double Rivet differ in both appearance range and wheel fitment range. Firestone Balloon is offered in Blackwall, Wide Whitewall, and Double-Whitewall forms, carries a listed maximum load of 1930 pounds at 40 psi, and fits 3.75 to 4.00-inch rims. Michelin Double Rivet appears in Blackwall form and fits 3.00 to 3.75-inch rims.

That means the choice is not just about brand name. Firestone gives more visual flexibility if the restored car needs a whitewall treatment, while Michelin may better suit a narrower wheel within the same nominal size. On a 1926 Locomobile 48 or 90, the right pick comes from balancing wheel width, desired appearance, and the style of restoration. Comparing those details first is more useful than assuming all 700-21 products behave identically simply because the size code matches.

1926 Locomobile tires can be suitable for highway use when they are the correct size for the model, are in sound condition, and are used within the capabilities of the tire and the car. The available products here are bias-ply tires, which are entirely appropriate to the period but deliver a different road feel from later radial designs. No speed rating letters are listed for the available 700-21 products, so the emphasis should stay on proper condition, correct inflation, and realistic speeds for a 1920s luxury automobile.

On a car of this age, the broader mechanical system often sets the real pace before the tire does. Brakes, steering, suspension, wheel condition, and overall chassis health all matter just as much as the rubber when planning highway travel. If your 1926 Locomobile will see sustained road use, inspect the tires closely, verify the wheels, and be honest about how the car is meant to be driven. A well-prepared touring pace is the right mindset for pre-war motoring.

Inflation pressure on a 1926 Locomobile should be matched to the exact tire size and product rather than borrowed from another size. In the available 700-21 range, Firestone Balloon products list a maximum load of 1930 pounds at 40 psi. That figure is a tire rating point, not automatically the pressure every 1926 Locomobile should run in all conditions.

For actual service pressure, compare the tire maker's rated information with the vehicle's original guidance if you have it, then tune within that framework for the car's load and use. A senior Locomobile used for touring may want a different setup from one driven only onto show fields. Avoid transferring a pressure figure from 700-21 to 33X6.75 or to the Jr. 8 sizes, because each tire family should be evaluated on its own terms.

Before a longer drive in a 1926 Locomobile, inspect each tire for cracking, cuts, bulges, embedded debris, and uneven tread wear, then confirm that the tires are holding the intended pressure. Check valve stems, make sure the spare is usable, and look over the wheels themselves for age-related issues that a modern car owner might never think about. On a pre-war car, the tire is only one piece of the readiness picture, but it is one of the most visible and easiest to evaluate.

A sensible longer-drive routine also includes checking brakes, steering play, fluids, lights, and the basic tool and jack kit that belongs with the car. Vintage touring rewards prevention, not improvisation at the roadside. If the tires have been sitting through a long storage period, take a short local drive first to feel for vibration or temporary flat-spotting before heading farther out. That brief test can reveal problems while you are still close to home.