The 1930 Reo 15 Series comes from an era when independent truck and automobile makers still carried strong regional identities, and tire choice was closely tied to both wheel design and the vehicle’s intended road use. On a vehicle like this, appearance and fitment matter just as much as basic size. The 1930 Reo 15 Series uses bias-ply tires, with 28X5.50 and 550-18 both appearing in this fitment range on 18-inch wheels. That opens the door to different period-style presentations, including blackwall, wide whitewall, and double-whitewall options across several vintage tire lines. The right selection starts with confirming which of the two sizes is on the vehicle now and matching that choice to restoration goals and wheel setup.
Which Tire Size Is Right for The 1930 Reo 15 Series
The 1930 Reo 15 Series uses two primary tire sizes, and both are bias-ply fitments tied to 18-inch wheels. Because the Base sub-model can be associated with either size, the first step is confirming which tire size is already on the vehicle and making sure the wheel dimensions match before choosing a period-style replacement.
The 28X5.50 size uses an older diameter-by-section format, where 28 refers to the tire’s approximate overall diameter and 5.50 refers to its section width in inches. It is a bias-ply fitment that suits the pre-war character of the 1930 Reo 15 Series and reflects the sizing language common in this period. Because this format is less familiar to modern buyers, it is especially important to confirm the actual wheel and current tire markings on the vehicle. This size is best evaluated by comparing the tire already mounted and making sure the overall look and wheel compatibility remain appropriate.
The 550-18 size is a numeric bias-ply format in which 5.50 represents the tire’s nominal section width in inches and 18 identifies the rim diameter. On the 1930 Reo 15 Series, this is the size with the broadest visible product selection, all in bias-ply construction and all aimed at traditional vintage fitment. Available choices include Excelsior, Firestone, BFGoodrich, and Michelin, with blackwall, wide whitewall, and double-whitewall presentations across series such as Comp H, Firestone Classic Bias Ply, Silvertown Classic Bias Ply, and Double Rivet. It is the size to study closely when period-style appearance and product variety are central to the decision.
Sub-model fitment is straightforward here because the covered 1930 Reo 15 Series Base is associated with the same overall size range. What matters most is confirming which of the two bias-ply sizes is actually mounted on the vehicle before selecting a replacement.
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1930 Reo 15 Series Base
The 1930 Reo 15 Series Base can use either of the two primary bias-ply tire sizes associated with this fitment range. That makes the selection process less about trim differences and more about checking the wheel and existing tire markings so the replacement matches the vehicle’s current setup and intended appearance.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 1930 Reo 15 Series Tires for Sale
Available 550-18 choices give the 1930 Reo 15 Series a useful spread of vintage bias-ply options from Excelsior, Firestone, BFGoodrich, and Michelin. The product grid is where to compare sidewall style, tire series, rim-width specification, and period-style presentation.
These FAQs focus on 1930 Reo 15 Series tire size identification, 18-inch rim fitment, bias-ply selection, period-style sidewall choices, and the checks that matter before putting a restored or lightly used vehicle back on the road.
Tire Size & Fitment
What tire size fits a 1930 Reo 15 Series?
The 1930 Reo 15 Series is associated with two primary bias-ply tire sizes: 28X5.50 and 550-18. Both appear within this vehicle’s fitment range, and the 1930 Reo 15 Series Base can be tied to either size rather than one exclusive sub-model-specific choice.
That means the real job is confirming which size is already on the vehicle before ordering a replacement. Check the markings on the existing tire, verify that the wheel is an 18-inch rim, and compare the overall setup carefully if the vehicle has been restored or modified over the years.
What size rim does a 1930 Reo 15 Series use?
The 1930 Reo 15 Series uses an 18-inch rim with its primary tire fitments. The numeric 550-18 size states that rim diameter directly, and the available products in that size are built for 18-inch wheels.
Rim diameter is only part of the check on a vehicle of this age. Wheel width, bead condition, and whether the wheels are original or later replacements can all affect the final choice, so it is smart to inspect the wheel itself instead of relying only on the vehicle year and model name.
What does 550-18 mean on a 1930 Reo 15 Series?
In 550-18, the 5.50 refers to the tire’s nominal section width in inches, while 18 refers to the rim diameter in inches. It is a numeric bias-ply size, which is a common vintage sizing format for vehicles from this era.
Understanding the format helps separate tire size from sidewall style or brand choice. Once 550-18 is confirmed on the vehicle, the next step is deciding whether a blackwall, wide whitewall, or double-whitewall presentation best suits the Reo’s restoration style and the wheel dimensions already in place.
Choosing the Right Tire
What should I consider when choosing a 550-18 tire for a 1930 Reo 15 Series?
Start with the basics: confirm that 550-18 is the size actually mounted on the 1930 Reo 15 Series and that the wheel is an 18-inch rim in suitable condition for a vintage bias-ply tire. From there, construction stays straightforward because the available choices in this fitment are bias-ply.
The decision usually comes down to appearance, rim-width compatibility, and the character of the tire line you prefer. Some options emphasize a plain blackwall presentation, while others add wide whitewall or double-whitewall styling that can change the look of the vehicle dramatically without changing the core size.
What sidewall styles are available for 1930 Reo 15 Series tires?
For the 1930 Reo 15 Series in 550-18, available sidewall styles include blackwall, wide whitewall, and double-whitewall. Those choices create very different visual results even when the tire size and basic bias-ply construction remain the same.
A blackwall usually gives the vehicle a simpler, more utilitarian presentation, while whitewall treatments add a more formal restoration-oriented look. Sidewall style should be chosen alongside brand, series, and wheel width so the finished setup matches both the vehicle’s era and the way the Reo is being preserved or displayed.
What brands offer tires for the 1930 Reo 15 Series?
The available 550-18 tire options for the 1930 Reo 15 Series include Excelsior, Firestone, BFGoodrich, and Michelin. Those brands appear across several vintage bias-ply series rather than as one single uniform product type.
Brand choice is best treated as one part of a larger fitment decision. Compare the sidewall treatment, the tire series, and the wheel-width specification that matches your wheel, then choose the option that supports the appearance and road-use expectations you have for this pre-war Reo.
Restoration & Appearance
Which tire should I choose for a period-style 1930 Reo 15 Series?
A period-style 1930 Reo 15 Series usually starts with staying in one of its primary bias-ply sizes, either 28X5.50 or 550-18, depending on the wheel and tire setup already on the vehicle. That keeps the sizing and construction in step with the character of the era.
Within 550-18, the visual choice becomes more detailed because blackwall, wide whitewall, and double-whitewall options are all available. If exact historical authenticity matters, compare the finished look against marque literature, restored examples, or other authoritative references before settling on a sidewall style.
Does correct tire fitment matter for a 1930 Reo 15 Series restoration?
Correct tire fitment matters on a 1930 Reo 15 Series because tire size and construction strongly affect both appearance and stance on a pre-war vehicle. Even small differences in format can change how authentic or visually balanced the vehicle looks once it is fully assembled.
Fitment also matters mechanically, since wheel diameter, wheel width, and the condition of old rims all influence how well a tire setup works in service. A restoration-minded buyer should confirm the size on the vehicle first, then choose the sidewall style and tire series that best suit the intended presentation.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1930 Reo 15 Series?
Yes. Even though the 1930 Reo 15 Series uses vintage bias-ply sizing, later wheel changes, brake conversions, suspension work, or body alterations can affect what fits safely and what still looks proportionate. That is especially important when a vehicle has passed through multiple restorations over time.
A modified setup should be checked at the wheel itself rather than assumed from the model name alone. Measure wheel diameter and width, inspect steering and fender clearance, and compare the actual mounted tire size before replacing anything so the new tire matches the vehicle as it sits today.
What should I inspect before driving a 1930 Reo 15 Series on new tires?
Before road use, inspect the wheels for cracks, rust, bent flanges, and bead-seat condition, then make sure the tires are properly mounted and inflated. On the tires themselves, look for any shipping or installation damage, confirm even seating, and verify that the tread and sidewalls are clean and sound.
A short, careful test drive is wise on a vintage vehicle after tire installation. Recheck inflation, inspect for rubbing at full steering lock, and look over the suspension and steering components as well, since a fresh set of tires cannot compensate for worn mechanical parts on an older Reo.
How should 550-18 tires on a collector 1930 Reo 15 Series be maintained?
Collector-car tire care starts with regular visual inspection and stable storage conditions. A 550-18 bias-ply tire on a 1930 Reo 15 Series should be checked for pressure loss, sidewall cracking, cuts, bulges, and uneven wear, even if the vehicle is driven only occasionally.
Storage habits matter just as much as mileage on a lightly used pre-war vehicle. Keep the Reo away from prolonged sunlight, excess heat, moisture, and ozone sources, and move or exercise it periodically so the tires are not left supporting the same load in one position for long stretches.
