1957 Opel Caravan & Wagon Tires

The 1957 Opel Caravan & Wagon uses two recognized tire sizes: 640-13 in bias-ply construction and 175R13 in radial construction. Both sizes are associated with a 13-inch wheel diameter, so the fitment choice centers on construction type and size format rather than on changing to a different rim diameter.

That means the first step is deciding whether the car is staying with a traditional bias-ply setup or running a radial configuration. Wheel width, current wheel type, and overall clearance should still be confirmed before purchasing, especially if the Opel has been updated with replacement wheels or suspension changes over the years.

The 1957 Opel Caravan & Wagon uses a 13-inch rim with both of its recognized tire sizes, 640-13 and 175R13. Even though the tire markings use different sizing systems, the wheel diameter remains the same across those two fitment paths.

That shared 13-inch diameter simplifies the decision, but diameter alone does not settle the full fitment question. Wheel width still matters, particularly when comparing a vintage bias-ply tire with a radial alternative, so it is smart to verify the actual wheel on the car before changing construction or selecting an equivalent radial size.

The 1957 Opel Caravan & Wagon Base follows the same fitment pattern, using either 175R13 in radial form or 640-13 in bias-ply form. There is no separate alternate size tied only to the Base within this coverage, so the choice stays within those two 13-inch options.

That makes the Base model easier to shop for, because the main question becomes which construction and appearance better suit the car. Owners focused on a traditional look may lean toward the numeric bias-ply size, while a radial path calls for checking wheel width and confirming that the complete vehicle setup supports the change.

640-13 is a bias-ply tire size for the 1957 Opel Caravan & Wagon. It uses the older numeric bias-ply sizing system, and it represents the vintage-style construction choice in this fitment range, as opposed to 175R13, which is the radial-size option on the same 13-inch wheel diameter.

Choosing 640-13 usually means the owner is keeping a more traditional tire profile and presentation on the car. Before switching away from it, confirm the actual wheel width and the intended use of the Opel, since a move from bias-ply to radial can affect both appearance and how the tire interacts with the existing wheel setup.

Radial equivalents for 640-13 include 175R13 as the 80-series metric radial, P175/75R13 as the 75-series P-metric radial, P185/70R13 as the 70-series P-metric radial, and 650R13 as a bias-look radial equivalent. These options all serve as comparison points for owners considering a radial alternative to the original numeric bias-ply size.

The useful difference between them is the sizing format and profile family rather than a promise of automatic interchangeability. A recommended rim-width range of 4 to 6 inches is part of the equivalent guidance, and the final decision should still account for wheel width, overall dimensions, and available clearance on the individual car.

Start by confirming the wheel diameter and width, since the 1957 Opel Caravan & Wagon uses a 13-inch rim and radial equivalents for 640-13 are tied to a recommended 4- to 6-inch wheel-width range. The next step is comparing the intended radial size with the car's actual wheel and fender space.

A conversion also deserves a close look at steering clearance, suspension condition, and the car's current ride height. Any aftermarket wheels, brake changes, or previous body repairs can alter the space available, so the safest approach is to treat an equivalent radial as an alternative that still needs to be checked on the specific Opel.

The first consideration is whether 640-13 matches the goal for the car, because it is the bias-ply size rather than the radial one. From there, look at sidewall treatment, tire series, load capacity, and rim-width compatibility so the tire supports both the appearance and the wheel setup of the Opel.

A 640-13 buyer is often balancing visual authenticity with practical use. If the car is mainly for shows or period-style presentation, the traditional numeric bias-ply format may be the stronger fit, while any move toward radial behavior belongs in the separate equivalent-size conversation instead of forcing that expectation onto the bias-ply size.

The available sidewall style in the current 640-13 product selection is a wide whitewall. That makes sidewall appearance a meaningful part of the buying decision for a 1957 Opel Caravan & Wagon, especially because a small postwar wagon can look noticeably different depending on how much white sidewall is shown.

Sidewall choice should still be tied back to the car's overall presentation rather than treated as decoration alone. Buyers restoring a stock-looking wagon often want a traditional visual balance, while others may simply want a vintage-inspired look that suits the paint, trim, and wheel finish already on the vehicle.

BFGoodrich is represented in the available product selection for the 1957 Opel Caravan & Wagon, specifically in the 640-13 bias-ply fitment. That means the current product comparison on this page is focused more on the character of the available tire than on choosing among several competing brands in the same size.

When brand variety is limited, the better comparison points are tire construction, sidewall styling, series name, and wheel compatibility. For this Opel, a buyer should keep the fitment decision anchored to size and construction first, then decide whether the available BFGoodrich offering matches the desired restoration look and road-use plan.

A period-style 1957 Opel Caravan & Wagon usually starts with the 640-13 bias-ply size, since that size and construction preserve the older tire format associated with the car's era. It also keeps the choice within the proper 13-inch wheel diameter while maintaining a more traditional sidewall and overall visual character.

That does not automatically make every tire in that size historically exact for every restoration. Buyers pursuing strict originality should compare the car against marque references or period documentation, while those aiming for a strong vintage presentation can focus on the correct size, bias-ply construction, and a sidewall treatment that suits the wagon's trim and stance.

Tire construction changes the visual tone of a restored 1957 Opel Caravan & Wagon because a bias-ply 640-13 presents the car in an older sizing language, while a 175R13 radial introduces a later-style radial format. Even before the car moves, that difference can influence whether the wagon reads as strictly vintage or subtly updated.

Appearance is only part of the decision, but it matters a great deal on a compact collector car with relatively small wheels. Owners should think about sidewall style, the intended restoration level, and whether the car's wheels are better suited to remain in a bias-ply setup or to support a radial alternative cleanly.

Yes, modifications can affect tire fitment on a 1957 Opel Caravan & Wagon even when the tire size appears correct on paper. Aftermarket wheels, changed wheel width, altered ride height, replacement suspension parts, or body repairs can all influence how a 13-inch tire sits and clears during steering and suspension movement.

That is especially important when moving between the 640-13 bias-ply size and radial alternatives such as 175R13 or other equivalent formats. Any Opel that has been modified should be measured at the wheel and checked for fender, suspension, and steering clearance before treating a familiar size code as automatically suitable.

Inspect the wheels, valve stems, lug hardware, and the surrounding suspension and steering components before driving a 1957 Opel Caravan & Wagon on new tires. The tires themselves should be checked for proper seating, inflation, visible sidewall issues, and adequate clearance at the front and rear once the car is resting at normal ride height.

A short, careful road test is a smart next step because it can reveal rubbing, vibration, or steering interference that is not obvious in the garage. Collector vehicles that sit for long periods also deserve a fresh look for fluid leaks, brake condition, and any uneven stance that could affect how the new tires contact the road.

640-13 tires on a collector 1957 Opel Caravan & Wagon should be maintained with regular pressure checks, periodic visual inspection, and careful monitoring for sidewall cracking, bulges, cuts, or irregular tread wear. Because collector vehicles often see low annual mileage, age and storage conditions can matter as much as tread depth.

Clean, dry storage away from prolonged sunlight, ozone sources, and extreme heat helps preserve an older-style tire's condition. The car should also be moved or repositioned periodically if it sits for long stretches, and any tire that shows persistent air loss or visible deterioration deserves professional evaluation before road use.