1929 Elcar 120 Series Tires

The 1929 Elcar 120 Series uses two primary tire sizes: 30X5.77 and 650-20. Both are bias-ply fitments, but they belong to different sizing families and do not use the same rim diameter, so they should not be treated as interchangeable choices for the same wheel.

The practical next step is to confirm which wheels are actually on the car. A 30X5.77 setup uses a 7-inch rim, while 650-20 uses a 20-inch rim. On an older collector vehicle, wheels may have been changed over time, so the tire decision starts with the installed rim diameter rather than assuming every 1929 Elcar 120 Series carries the same wheel arrangement today.

A 1929 Elcar 120 Series can be associated with two different rim diameters depending on which tire size is on the car. The 30X5.77 fitment uses a 7-inch rim, while the 650-20 fitment uses a 20-inch rim. Both sizes are bias-ply, but they belong to completely different wheel setups.

That makes wheel verification more important than brand comparison at the start of the buying process. Measure the existing wheel diameter and confirm the actual size stamped on the current tires if they are still readable. On a prewar vehicle, replacement wheels, mixed wheel sets, or long-ago repairs can change what is mounted, so physical inspection is the safest way to sort out fitment.

30X5.77 is an antique diameter-by-section tire size. The 30 refers to the tire's approximate overall diameter in inches, and 5.77 refers to its approximate section width. On the 1929 Elcar 120 Series, it is a bias-ply fitment tied to an early tire-sizing convention rather than the later numeric bias-ply format many collectors recognize more quickly.

Reading the size correctly helps avoid confusing it with a later rim-diameter-based code. The important takeaway is that this tire belongs to a 7-inch rim setup, not the 20-inch wheel used with 650-20. If the car has been modified or re-wheeled at any point, checking the current wheel dimensions before ordering is more reliable than choosing by appearance alone.

Start with the basics: confirm that the car actually uses the 650-20 wheel setup, then compare the available bias-ply products by sidewall appearance, tire series, and intended use. In this size, choices include blackwall and wide whitewall versions, along with both classic passenger-style products and truck-oriented offerings from Firestone, Denman, and Deka.

Selection should reflect how the car will be presented and driven. A restoration-minded owner may focus on traditional appearance, while a car used more regularly may place more weight on specification details such as rim-width range, load figure where stated, and overall product character. It also helps to inspect wheel condition before mounting new tires on a prewar vehicle.

The available 650-20 products for the 1929 Elcar 120 Series include blackwall and wide whitewall sidewall styles. That gives owners a meaningful appearance choice within the correct size, especially when the car's presentation matters as much as basic road use. The 30X5.77 fitment does not have the same visible product assortment here.

Sidewall style changes the look of a prewar car more than many buyers expect, so it helps to decide whether the goal is a more understated roadgoing presentation or a brighter restoration-oriented look. Since sidewall style does not override fitment, choose the appearance only after confirming the correct wheel setup and tire size already on the vehicle.

For the 650-20 fitment on a 1929 Elcar 120 Series, available brands include Firestone, Denman, and Deka. Those options cover several product series, including Firestone Classic Bias Ply, Firestone Classic Truck, Highway Classic Truck, and Deka Classic Truck, so the brand choice also brings a difference in product character.

Brand selection should follow size confirmation, not replace it. Once the car's wheel setup is verified, compare each option by sidewall treatment, intended use, and specifications such as rim-width range or load figure where those details are given. A prewar car that is shown occasionally may call for a different presentation than one expected to see more frequent road miles.

A period-style starting point for a 1929 Elcar 120 Series is staying with the correct bias-ply size for the car's actual wheel setup, either 30X5.77 or 650-20. That preserves the early tire construction and sizing language associated with the era, which matters on a prewar automobile where wheel-and-tire presence strongly affects the car's overall character.

After size is confirmed, appearance choices become more specific. In 650-20, blackwall and wide whitewall options create distinctly different visual impressions, but neither should be assumed factory-correct without vehicle-specific historical support. Owners pursuing exact originality should compare surviving photos, marque-club guidance, and restoration records before settling on sidewall style or series.

Correct tire fitment matters a great deal on a 1929 Elcar 120 Series because tire size, wheel diameter, and construction all shape how a prewar car sits and how authentic it appears. Using the proper bias-ply fitment for the installed wheels helps preserve the vehicle's stance and keeps the restoration from looking visually off even at a glance.

Fitment also affects the practical side of a restoration. A mismatched tire-and-wheel combination can complicate mounting, clearance, and general road readiness, especially on a vehicle that may have seen changes over many decades. Verifying the wheel setup early in the project saves time and helps narrow the choice between a more understated blackwall look and a stronger whitewall presentation.

Yes, modifications can change tire fitment on a 1929 Elcar 120 Series. Replacement wheels, altered brake components, suspension work, body repairs, or long-ago wheel swaps can all affect which tire size belongs on the car today. That matters even more here because the two primary sizes use completely different rim diameters.

A modified or partially restored car should be inspected as it sits rather than judged only by model-year expectations. Measure wheel diameter and width, look for clearance around fenders and steering components, and check whether front and rear wheels match. On an older collector vehicle, these basic checks often prevent ordering a tire that is historically plausible but wrong for the car's current setup.

Before driving a 1929 Elcar 120 Series on new tires, inspect the wheels for damage, corrosion, or poor bead-seat condition, and confirm that each tire is mounted in the correct size for the wheel. It also helps to check valve hardware, inflation pressure, and basic clearance at the fenders, suspension, and steering through a full range of movement.

A short, careful test drive is the right next step on a prewar car. Recheck pressure afterward and look for any rubbing, unusual wear marks, or signs that the tire is not seating or tracking properly. Since many collector cars spend long periods parked, it is wise to inspect the rest of the running gear at the same time rather than treating tires in isolation.

Tires on a collector 1929 Elcar 120 Series should be maintained with regular pressure checks, visual inspections, and careful storage habits. Look for cracking, cuts, bulges, uneven wear, and slow air loss, especially if the car is driven only occasionally. Low-use collector vehicles can show age-related tire issues long before tread wear becomes the deciding factor.

Storage conditions matter almost as much as mileage on a prewar automobile. Keeping the car away from prolonged sunlight, excess heat, moisture, and ozone sources can help preserve tire condition over time. It is also smart to inspect the tires before every road outing and give them extra attention before a longer drive, even if the car has covered very few recent miles.