Reo 15 Series Tires

The Reo 15 Series is listed with two tire sizes for 1930: 28X5.50 and 550-18. The 550-18 size is a numeric bias-ply size for an 18-inch rim, with listed products covering rim widths from roughly 3 to 4.5 inches. The 28X5.50 size is an antique diameter-by-section code in which 28 refers to overall tire diameter and 5.50 refers to nominal section width, so the wheel diameter is not stated in the size itself.

The practical takeaway is that year alone is not enough to choose correctly for a Reo 15 Series. Check the wheel diameter on the car, compare the existing tire markings if they are still present, and verify whether the car is using the antique size convention or the later 18-inch numeric size before moving ahead with a replacement.

On a Reo 15 Series, 28X5.50 is an antique diameter-by-section size. The first number, 28, is the tire's approximate outside diameter in inches, and the second number, 5.50, is the nominal section width. Unlike a modern size or a numeric rim-based size, this code does not tell you the wheel diameter.

That difference matters because a buyer can easily mistake 28 for a wheel size when it is actually the tire's full height. If your Reo 15 Series carries this marking, inspect the wheel itself and compare the tire format carefully before choosing a replacement, especially since 1930 cars are also listed with 550-18.

A 1930 Reo 15 Series can appear with either 28X5.50 or 550-18 because two different size conventions are associated with that single model year. One is an antique diameter-by-section format and the other is a numeric bias-ply size tied directly to an 18-inch rim. That points to a configuration difference that has to be identified on the individual car.

The safest approach is to treat the year as a starting point, then verify the actual wheel diameter and the tire marking style already fitted to the car. If the car has been restored in the past, do not assume the current tires are correct; compare against wheel measurements and period references for the specific Reo 15 Series you own.

The Reo 15 Series clearly uses an 18-inch rim when fitted with 550-18 tires. The other listed size, 28X5.50, does not reveal wheel diameter in the code, because antique sizing uses outside tire diameter first rather than rim diameter. That means the Reo 15 Series cannot be assigned a single wheel size without checking which of the two tire formats the car uses.

For a car wearing 550-18, the answer is straightforward: it needs an 18-inch wheel. For a car marked 28X5.50, measure the wheel and compare the current setup carefully before replacing anything, since reading the antique size as though it were a rim-size code will lead you in the wrong direction.

Start with the wheel diameter and the tire size marking already associated with the car. A 1930 Reo 15 Series is listed with both 28X5.50 and 550-18, and those are not interchangeable ways of writing the same thing. The 550-18 size is for an 18-inch rim, while 28X5.50 follows the older overall-diameter-by-section-width convention.

Measure the wheel, inspect any surviving tire markings, and compare the car against original-era references for the exact body and chassis configuration. That extra step matters on a transitional model-year fitment like the Reo 15 Series, because choosing by year alone can put you into the wrong size family before you ever look at tread or sidewall style.

For the 550-18 Reo 15 Series size, available sidewall styles include blackwall, wide whitewall, and double-whitewall. Those choices appear across several bias-ply offerings and give restorers room to match the visual character of the car. Blackwall is the most restrained period look, while whitewall variants create a more formal, dressed appearance.

Sidewall style should be chosen after size and wheel diameter are settled, not before. If your Reo 15 Series is being restored for show presentation, period photos, factory literature, and marque expertise are the best ways to decide whether a plain blackwall or a whitewall treatment better suits the specific car you are finishing.

Reo 15 Series tires in the listed 550-18 size are available from Excelsior, Firestone, BFGoodrich, and Michelin. Those brands appear across several period-style bias-ply series, including Firestone Classic Bias Ply, BFGoodrich Silvertown Classic Bias Ply, Excelsior Comp H, and Michelin Double Rivet. Each offers a slightly different appearance and historical character while staying within the same general fitment family.

Brand choice is usually the second decision after you have settled the correct size and wheel diameter for the car. Once fitment is confirmed, compare sidewall styling, tread presentation, and the restoration goal for your Reo 15 Series, whether that means a cleaner touring look, a more formal whitewall appearance, or a distinctly early-period tread style.

The listed Reo 15 Series offerings in 550-18 include Firestone Classic Bias Ply, BFGoodrich Silvertown Classic Bias Ply, Excelsior Comp H, and Michelin Double Rivet. All are bias-ply tires, but they represent different period-style lines and visual presentations rather than one single interchangeable look. Some are offered as blackwalls, while others are available with wide whitewall or double-whitewall styling.

That means the choice is not only about brand but also about the kind of restoration finish you want the Reo 15 Series to carry. A factory-minded restoration may call for one visual approach, while a touring or show presentation may favor another, so compare the series by appearance and era character after the fitment itself is settled.

A Reo 15 Series should be stored in a cool, dry, dark space away from direct sunlight, ozone sources, and major temperature swings. Bias-ply collector tires benefit from clean flooring, proper inflation, and long periods without excessive weight concentrated in one contact patch. If the car will sit for months, moving it occasionally or supporting it appropriately helps reduce flat-spotting and casing stress.

Good storage practices matter as much as mileage on a low-use antique or pre-war car. Keep petroleum products off the sidewalls, avoid parking on damp soil or bare concrete for long periods, and inspect the tire surfaces every time the Reo 15 Series comes out of storage so age-related issues are caught before the car returns to use.

Tires on a Reo 15 Series should be inspected before each outing and more thoroughly at regular seasonal intervals. On a collector car with bias-ply tires, look for cracking, tread separation, impact damage, valve-stem condition, and any signs that the casing has been run underinflated. A car that sits most of the time can still develop age-related problems even when tread wear is minimal.

Routine inspections are especially important on a pre-war car because use patterns tend to be intermittent and the consequences of a failure can be hard on both the vehicle and its occupants. Make inspection part of every drive-prep routine for the Reo 15 Series, and have any suspicious tire evaluated by a specialist before putting road miles on it.

A Reo 15 Series tire should be replaced when age cracking, sidewall checking, casing distortion, repeated air loss, vibration, or any sign of structural deterioration appears, even if the tread still looks usable. Collector tires often age out long before they wear out. Tread depth alone is not a reliable guide on a low-mileage pre-war car.

Replacement decisions should be conservative because antique and early collector cars put unusual demands on old tire casings. If a Reo 15 Series carries a tire of uncertain age or one that has spent years in static display service, treat condition and age as more important than appearance and have the assembly reviewed before continued road use.

The Reo 15 Series is associated here with two period-appropriate size families for 1930: 28X5.50 and 550-18. The listed products for 550-18 include several bias-ply series such as Firestone Classic Bias Ply, BFGoodrich Silvertown Classic Bias Ply, Excelsior Comp H, and Michelin Double Rivet. That tells you the car sits in a period where more than one historically suitable tire style can be relevant depending on the exact configuration.

For a restoration, the right answer is tied to the specific Reo 15 Series you own rather than the model name alone. Original literature, surviving cars, and marque expertise are the best references for narrowing the correct size family, tread style, and sidewall treatment before you decide which period-style tire best matches your project.

Correct tire fitment can absolutely affect how a Reo 15 Series is evaluated in restoration and judging settings. Size family, wheel diameter compatibility, sidewall style, and the overall period look all contribute to whether the finished car appears faithful to its era. A visibly mismatched tire can stand out even to casual observers on a carefully restored pre-war automobile.

Judging standards vary, but serious restoration work usually rewards details that align with the car's actual production-era presentation. If your Reo 15 Series is being built for concours or marque judging, settle the wheel and size question first, then choose the sidewall and tire series that best support the authenticity level you want the car to show.

Reo 15 Series tires in 550-18 are offered in blackwall, wide whitewall, and double-whitewall styles. Each of those sidewall treatments creates a different visual impression, and any restoration choice should match the character and intended presentation of the specific car. Blackwall usually reads as more restrained, while whitewall styles emphasize a more formal and upscale appearance.

The correct choice depends on how the individual Reo 15 Series was equipped and how faithfully you want to follow period presentation. Study original photos and factory-era references for cars similar to yours, because sidewall style is one of the easiest details to notice once the car is fully assembled and on its wheels.

A properly selected and properly maintained tire can make a Reo 15 Series suitable for careful public-road use within the limits of a 1930 automobile and its chassis, brakes, and steering. The listed 550-18 options are bias-ply tires intended for period-style fitment, not modern high-speed touring use. Safety depends on correct size selection, proper inflation, wheel condition, tube condition where required, and the mechanical state of the car as a whole.

Public-road use in a Reo 15 Series should always be approached as vintage motoring rather than ordinary daily driving. Before putting miles on the car, confirm the fitment, inspect the complete wheel-and-tire assembly, and drive with the understanding that stopping distance, handling response, and stability will reflect early automotive design rather than modern expectations.

Before driving a Reo 15 Series, check tire pressure, visible sidewall condition, tread integrity, valve stems, wheel fasteners, and any sign of tube or bead-related air loss. Confirm that the tire size on the car matches the wheel it is mounted on, especially because 1930 Reo 15 Series fitments include both 28X5.50 and 550-18. A final walkaround should also include brakes, steering response, and wheel-bearing condition.

That pre-drive inspection matters because a collector car often spends long periods parked between outings. Catching a soft tire, a cracked sidewall, or an incorrect assembly before the car moves is far easier than dealing with a failure on the road, and it protects both the Reo 15 Series and the people riding in it.

A Reo 15 Series on period-style bias-ply tires should be driven at conservative speeds that respect the capabilities of the tire design and the 1930 automobile itself. Even with newly manufactured collector tires, the driving experience is not comparable to a modern radial-equipped car. Stability, braking, and steering response all call for moderation.

The right approach is to drive a Reo 15 Series at speeds that feel well within the comfort zone of the car rather than near the pace of surrounding modern traffic. Smooth inputs, extra following distance, and avoidance of abrupt lane changes will do more for safe enjoyment than any attempt to make a pre-war car behave like a contemporary highway machine.