Locomobile 90 Tires

Locomobile 90 uses two listed tire sizes across 1926 and 1927: 33X6.75 and 700-21. The 33X6.75 size is an older antique diameter-by-section format, while 700-21 is a numeric bias-ply size built for a 21-inch rim. Both sizes appear for both production years rather than separating neatly by year, so year alone does not identify the correct fitment.

The practical takeaway is that a 1926 or 1927 Locomobile 90 owner should confirm the wheel and tire setup on the actual car before choosing a replacement. Restored cars, long-service cars, and cars updated during earlier repairs may not still wear the same format they left with decades ago. Use the year listing as the first filter, then confirm whether the car is built around the oversized 33X6.75 format or a 21-inch wheel using 700-21 tires.

On a Locomobile 90, 33X6.75 is an antique diameter-by-section size. The first number, 33, is the tire’s overall outside diameter in inches, and the second number, 6.75, is the nominal section width. Unlike a later size such as 700-21, the wheel diameter is not written into the 33X6.75 code, which is why this format can confuse modern buyers.

That difference matters because you cannot identify the wheel size from the 33X6.75 marking alone. A Locomobile 90 using this older format needs the wheel and tire arrangement verified physically or against reliable marque information before any replacement is chosen. It is especially important on a high-end pre-war automobile, where earlier restorations may have preserved one setup while another car from the same year may have been converted to a different size system.

A 1926 Locomobile 90 has two tire sizes listed because the same model appears with two different sizing systems: 33X6.75 and 700-21. That is not simply a case of two brand options in one identical size. It indicates a fitment split tied to wheel and tire configuration, with one size using the older oversized format and the other built around a 21-inch rim.

For an owner, that means the right choice comes from identifying the actual wheels and the way the car is presently set up, not from assuming all 1926 examples use one universal tire. Start by checking the markings on the current tires if they are readable, then inspect the rim diameter directly where possible. Cars from this period often lived long, changeable service lives, so configuration matters more than model year alone.

Locomobile 90 uses a 21-inch rim when fitted with 700-21 tires. The 33X6.75 size does not reveal wheel diameter in the size code, because that antique format identifies outside diameter and section width rather than rim size. As a result, the Locomobile 90 cannot be assigned one rim diameter across all listed fitments without checking which size system the car actually uses.

That makes rim confirmation one of the first checks before selecting a tire for a Locomobile 90. If the car wears 700-21, the replacement must match a 21-inch wheel. If the car is set up for 33X6.75, inspect the wheel and compare it with trustworthy vehicle records or marque expertise before moving ahead, since the code itself does not provide the wheel diameter.

A 1927 Locomobile 90 can use either 33X6.75 or 700-21, so the correct tire is confirmed by the actual wheel and tire arrangement on the car. If the car is fitted with 700-21, it uses a 21-inch rim. If the car carries 33X6.75, the tire marking identifies outside diameter and section width, so the wheel diameter must be verified separately.

The best approach is to inspect the current tires and wheels together rather than relying only on the model year. Read any existing size markings, measure the rim where practical, and compare what you find with restoration paperwork or marque references tied to that specific car. That extra step is worthwhile on a Locomobile 90 because both listed sizes appear in both production years, and collector cars are often changed during long-term ownership.

For Locomobile 90 tires in 700-21, available sidewall styles include blackwall, wide whitewall, and double-whitewall. Those styles appear across Firestone, Michelin, Lester, and Excelsior offerings in the listed products for that size. The visible choice is broad enough to suit an owner seeking either a more restrained touring appearance or a more formal, show-oriented presentation.

A period-minded Locomobile 90 restoration should treat sidewall style as part of the car’s overall character rather than a cosmetic afterthought. Blackwalls generally suit a more conservative pre-war presentation, while whitewall variations can better match certain luxury-car restoration themes from the era. The right choice depends on how the individual car is being restored, judged, and presented, so compare the tire look to period photos, surviving references, and the rest of the car’s trim.

The listed Locomobile 90 products include tires from Firestone, Michelin, Lester, and Excelsior. Those brands appear in the available 700-21 offerings, with multiple series represented, including Firestone Balloon, Michelin Double Rivet, Lester Classic Bias Ply, and Excelsior Comp H. Each provides a bias-ply approach suited to vintage applications, though the styling and series character differ.

Brand choice on a Locomobile 90 usually comes down to the combination of correct size, preferred sidewall appearance, and the overall restoration direction of the car. Some owners prioritize a specific visual look such as blackwall or whitewall, while others may be trying to echo a particular late-1920s character through the tire series itself. Once the size is settled, compare the available brands by sidewall style and construction family rather than choosing by name alone.

A Locomobile 90 should be stored in a cool, dry, dark environment with the tires kept away from direct sunlight, ozone sources, electric motors, heaters, and petroleum contamination. Because the listed tires are bias-ply vintage-type constructions, they benefit from stable inflation and from avoiding long periods with the full vehicle weight resting in one spot. Clean floors and a covered indoor space are far better than a damp garage or open shed.

Collector-car owners can reduce tire stress further by moving the Locomobile 90 periodically, slightly changing the tire contact patch, or using suitable supports when the car will sit for extended stretches. Inflate the tires to an appropriate operating pressure for the tire and vehicle combination before storage rather than leaving them visibly low. Good storage habits help preserve both the tire casing and the appearance of a valuable pre-war automobile.

Tires on a Locomobile 90 should be inspected before every drive and given a more thorough review several times خلال the year, especially if the car is used only seasonally. A close inspection should include sidewall cracking, tread separation, flat-spotting, loose valve hardware, irregular wear, and any signs that the tire is shifting on the rim. On a pre-war luxury car, visual checks are only the beginning because age-related internal changes can matter as much as external condition.

A practical routine is to perform a quick walkaround before moving the car, then schedule regular hands-on inspections with the wheels unloaded when possible. If the Locomobile 90 is driven in tours, judged events, or parade use, have a vintage-tire specialist evaluate the tires periodically as part of normal maintenance. Frequent inspection is inexpensive insurance on a heavy, valuable automobile that may spend long periods parked between outings.

Tires on a Locomobile 90 should be replaced when age, cracking, casing fatigue, deformation, impact damage, or any sign of separation makes continued use questionable, even if tread depth still looks serviceable. Collector tires often age out before they wear out, especially on low-mileage cars. On a pre-war automobile, elapsed time and storage history can be more important than apparent tread life.

That principle is especially important for a Locomobile 90 because the car’s weight and period chassis design place real demands on vintage-style tires even at modest speeds. If a tire’s age is uncertain, if the car has sat for many years, or if there is any doubt about casing health, have the set evaluated and replace suspect tires as a group when appropriate. Conservative replacement timing is part of responsible stewardship for an important collector car.

Locomobile 90 is associated here with two size types for 1926 and 1927: 33X6.75 and 700-21. The available product families for the 700-21 size include Firestone Balloon, Michelin Double Rivet, Lester Classic Bias Ply, and Excelsior Comp H, which shows that more than one period-style construction approach exists within the listed fitments. That means original-equipment determination for a specific car should be made by tying the car’s surviving wheels and historical references together.

For restoration work, the main goal is to establish whether the individual Locomobile 90 belongs with the older oversized format or the 21-inch balloon-style setup before choosing a brand or sidewall style. Once that is settled, period photographs, marque literature, and club knowledge can help narrow the most authentic look. A careful restoration treats tire size, tire series, and sidewall appearance as a matched package rather than independent choices.

Correct tire fitment can absolutely affect how a Locomobile 90 is judged, interpreted, and valued, especially because it is a rare pre-war luxury automobile where authenticity details carry weight. Size, construction family, and sidewall presentation all contribute to whether the car looks properly finished for its era. Even when a tire physically fits, an obviously wrong format or style can distract from the accuracy of an otherwise strong restoration.

Owners preparing a Locomobile 90 for judging should confirm not only the size but also whether the car is meant to wear a more conservative blackwall presentation or an era-appropriate whitewall variation. Marque clubs, concours guidelines, period photographs, and established restorers are often the best references for that final level of detail. On a significant car, proper tire fitment supports both historical credibility and the overall visual stance of the automobile.

For the Locomobile 90 in 700-21 size, Firestone Balloon and Michelin Double Rivet are two different listed tire series within the same broad vintage bias-ply world. Firestone Balloon is presented as a balloon-type offering and appears in blackwall, wide whitewall, and double-whitewall variations, while Michelin Double Rivet appears as a blackwall series in the same size. Both fit the same nominal 700-21 application but represent distinct series identities and visual presentations.

That distinction matters in restoration because the series name affects the tire’s period character as much as the raw size does. A Locomobile 90 owner choosing between them should think about the finished look of the car, whether a blackwall-only presentation is desired, and how closely the tire series matches the style of the build. For a serious restoration, series selection is part of getting the car’s era and personality right, not just getting rubber onto the wheels.

A Locomobile 90 fitted with correctly sized, properly mounted, sound-condition vintage-type tires can be used on public roads in the careful, limited manner expected of a pre-war collector automobile. The listed tires are bias-ply designs, so they should be treated as period-style equipment rather than as modern high-speed touring tires. Safety depends on the full condition of the tires, wheels, tubes, suspension, steering, and brakes, not on tread appearance alone.

In practice, a Locomobile 90 should be driven conservatively and only after a thorough mechanical review confirms that the entire running gear is ready for road use. Even with fresh tires, avoid thinking of the car as comparable to a modern vehicle in braking, stability, or emergency response. Sensible route planning, moderate speeds, and regular inspections are part of safe enjoyment of a large pre-war automobile.

Before driving a Locomobile 90, check tire inflation, visible sidewall condition, valve security, wheel fasteners, and any signs of flat-spotting or casing distress from storage. If the car uses 700-21 tires, confirm the tires match the 21-inch rims; if it uses 33X6.75, make sure the wheel and tire arrangement has already been positively identified. A quick inspection should also include steering play, brake response, fluid leaks, and the general condition of the chassis.

That pre-drive routine matters because a Locomobile 90 is a heavy, valuable, mechanically old automobile that may sit longer between uses than ordinary collector cars. Problems that seem minor in the garage can become serious once the car is moving. A disciplined inspection before each outing helps catch low pressure, age-related tire issues, or wheel mismatch concerns before they turn into road failures.

A Locomobile 90 on period-style tires should be driven at moderate, conservative speeds that respect the limits of bias-ply construction and the car’s overall pre-war chassis design. Even when the tire size and condition are correct, the appropriate pace is determined by the whole vehicle system, including steering, brakes, suspension, and road surface. Smooth, steady driving is more appropriate than sustained fast cruising or abrupt maneuvering.

For real-world use, treat the Locomobile 90 as a collector car meant for touring, exhibition, and careful secondary-road driving rather than modern traffic aggression. Build speed gradually, leave generous stopping distance, and back off immediately if the car begins to feel unsettled. The goal is preserving control and protecting the mechanical integrity of an important automobile, not testing the outer limits of vintage tire capability.