1967 Amphicar Tire Fitment Guide

1967 Amphicar vehicles use two tire sizes: 640-13 and 650-13. Both sizes fit the 1967 Amphicar Amphicar model, and both mount on 13-inch wheels. The 640-13 fits a 4.00 to 4.50 inch rim width range, while the 650-13 fits a 4.50 to 5.00 inch rim width range. Load capacity also differs, with 640-13 products rated at 1045 pounds at 32 psi and 650-13 products rated at 1150 pounds at 32 psi.

That overlap at 4.50 inches means some cars may physically accept either size, but wheel width should be checked before making a choice. On an Amphicar, size selection also influences the finished look, especially because whitewall styling differs between the two sizes. If originality matters, compare what is on the car now, inspect the wheel width, and confirm whether you want the narrower 640-13 fitment range or the broader whitewall choices available in 650-13.

On a 1967 Amphicar, 640-13 is a numeric bias-ply tire size. The 6.40 figure refers to the tire's nominal section width in inches, expressed in the older numeric style, and the 13 refers to the wheel diameter in inches. There is no radial construction marker in the code, so this size is understood as bias-ply. For the Amphicar, this size is paired with 13-inch rims in the 4.00 to 4.50 inch width range.

Modern buyers sometimes expect a size code to show aspect ratio or other detailed dimensions, but older numeric sizing is simpler than that. The practical takeaway is that 640-13 identifies an older-style bias-ply fitment with a specific wheel-diameter requirement and a fairly narrow rim-width window. If your Amphicar already has 13-inch wheels but you are unsure whether 640-13 is correct, measuring rim width is more useful than guessing from appearance alone.

Yes and no: every 1967 Amphicar uses the same basic model designation, but that model appears with two tire sizes rather than one. The Amphicar can use either 640-13 or 650-13 depending on the wheel-width range and how the car is set up. Both are bias-ply sizes and both fit 13-inch wheels, so the difference is not between separate body styles or a sedan-versus-convertible split.

That makes 1967 Amphicar fitment simpler than a multi-model passenger-car lineup, but it still does not eliminate the need to verify what is on your own car. An Amphicar that has been restored over the years may have had wheels or tires changed for appearance. Checking the sidewall on the existing tires, measuring the wheel width, and comparing whitewall style preferences will do more to settle the choice than relying only on the year and make.

For a 1967 Amphicar, both choices stay within period-correct bias-ply construction, so the decision is mainly about wheel-width compatibility, visual preference, and the stance you want. The 640-13 fits 4.00 to 4.50 inch rims and is available with a wide whitewall from BFGoodrich. The 650-13 fits 4.50 to 5.00 inch rims and is available from Coker Classic and US Royal in both wide and narrow whitewall styles. Both sizes use 13-inch wheels.

If your Amphicar has 4.00-inch wheels, the decision is essentially made for you because 640-13 is the correct rim-width match. At 4.50 inches, there is some overlap, so appearance becomes more important: 650-13 opens up more whitewall choices, while 640-13 stays on the narrower side of the fitment range. Once the wheel width is confirmed, decide whether you want the broader style selection of 650-13 or the more constrained, traditional presentation of 640-13.

1967 Amphicar tires are available with both wide whitewall and narrow whitewall sidewall styling, depending on size. The 640-13 comes with a wide whitewall, while the 650-13 is offered in both wide whitewall and narrow whitewall forms. That gives the Amphicar owner a meaningful appearance choice even while staying within the correct bias-ply era of the car. Whitewall width changes the visual character of the car more than many buyers expect.

A wide whitewall usually suits a distinctly mid-century presentation and tends to emphasize the Amphicar's charming, period personality. A narrow whitewall still feels vintage, but it gives the car a slightly cleaner and less ornate look. If the car is being restored to a specific historical photo or personal memory, match the sidewall style to that target. If your goal is simply an era-appropriate finish, either whitewall approach can look right as long as the size and wheel fit are correct.

1967 Amphicar tires are available from BFGoodrich, Coker Classic, and US Royal. BFGoodrich covers the 640-13 size with a wide whitewall bias-ply tire. Coker Classic and US Royal cover the 650-13 size, each offering wide whitewall and narrow whitewall bias-ply versions. All of these options stay within the vintage-style construction expected for a vehicle from this era.

Brand choice on an Amphicar often comes down to the exact size you need and the whitewall look you prefer rather than to a dramatic construction difference, because both available sizes remain bias-ply. If your car needs 640-13, the brand path is straightforward. If it needs 650-13, you have more flexibility to choose among period-flavored brands and two distinct whitewall presentations while keeping the car visually in character for 1967.

1967 Amphicar tires use 13-inch rims, but the approved rim width depends on the tire size. A 640-13 fits wheels from 4.00 to 4.50 inches wide, while a 650-13 fits wheels from 4.50 to 5.00 inches wide. The shared 13-inch diameter matters, but the width range is what determines whether a given tire is properly matched to the wheel. That difference is especially important because both sizes fit the same model.

The 4.50-inch width is the crossover point where both sizes can fall into range, so that measurement deserves extra attention. If your Amphicar has not been apart recently, remove a wheel and verify width directly rather than relying on an old tire size alone. Choosing by wheel width first helps avoid sidewall distortion, appearance issues, and the frustration of selecting a tire that is correct in diameter but wrong for the rim.

Inner-tube status is not marked in a way that creates a tube-versus-tubeless split across the current 1967 Amphicar tire options, so the more important question is the wheel itself. Both 640-13 and 650-13 are vintage-style bias-ply tires for 13-inch rims, and many collector vehicles of this era depend on the wheel design and condition as much as the tire construction when determining tube use. Amphicar ownership also adds the need for careful wheel-condition inspection because these cars often live in unusual storage environments.

Before installation, inspect the wheel thoroughly and check the specific tire's sidewall marking and fitment instructions. If the wheel has age-related pitting, questionable sealing surfaces, or a design traditionally paired with tubes, that deserves attention before the tire goes on. A restoration shop or marque specialist can help settle the question quickly, and it is better to make that decision at mounting time than after the car is assembled and ready to drive.

Original 1967 Amphicar wheels can often be used with either 640-13 or 650-13 because both sizes are built for a 13-inch rim diameter. The deciding factor is wheel width, not diameter alone. A 640-13 wants a 4.00 to 4.50 inch rim, while a 650-13 wants a 4.50 to 5.00 inch rim. At exactly 4.50 inches, both sizes fall within range.

That means many Amphicar owners do not need a different wheel diameter to move from one of these sizes to the other, but they still need to verify the actual rim width before assuming interchangeability. It is also wise to inspect original wheels for straightness, corrosion, bead-seat condition, and overall integrity before mounting fresh tires. On a specialty collector car like an Amphicar, a sound wheel matters just as much as the correct sidewall markings.

A 1967 Amphicar should be stored in a cool, dry space away from direct sunlight, electric motors, battery chargers, furnaces, and other ozone-producing equipment that can accelerate rubber aging. Because Amphicar tires are bias-ply, long static periods can encourage flat-spotting more readily than many radials. Clean, dry floors and correct inflation help the tire maintain its shape, and a breathable car cover is preferable to trapping moisture around the car.

If the Amphicar will sit for months, move it periodically or support it in a way that reduces constant load on one contact patch. That is especially worthwhile on collector cars that see seasonal use and spend much of the year parked. Keep water exposure in mind as well: even though the Amphicar is famous for amphibious capability, long-term storage is still kinder to tires, wheels, and valve hardware when everything is clean, dry, and protected from temperature swings.

On a 1967 Amphicar, tire life is usually judged more by age and condition than by mileage. Collector vehicles often travel relatively few miles, so sidewall aging, internal degradation, and storage history matter more than tread wear alone. A practical rule is to begin evaluating tires closely around five to seven years of age and to treat ten years as a strong point for replacement consideration, regardless of remaining tread. The DOT date code on the tire sidewall helps establish age.

An Amphicar that looks lightly used can still be riding on tires that are well past their best years if the car has spent long periods parked. Whitewall appearance can sometimes distract from more important structural aging, so condition checks should go deeper than cosmetics. If there is any question about age, cracking, recurring pressure loss, or long-unknown service history, replacing the tires is usually a wiser move than trying to extract a little more time from them.

Tires on a 1967 Amphicar should be inspected before every drive and again before any longer outing or event. Look for sidewall cracking, cuts, bulges, uneven wear, embedded debris, and signs that the tire is not holding pressure properly. Because these are vintage-style bias-ply tires, it is also worth paying attention to how they feel during the first few miles after storage. Any collector car that spends time parked deserves more frequent visual checks than a daily driver.

A quick pre-drive inspection is often enough to catch issues early, especially on a car that may see irregular use. Check valve stems and the spare at the same time so you are not overlooking the one tire most likely to be forgotten. If the Amphicar has been stored in a damp area or rolled on and off trailers, inspect the wheels as well. A few extra minutes in the garage can prevent a much bigger interruption once the car is out on the road.

A 1967 Amphicar Amphicar would have been fitted in the bias-ply era, and both 640-13 and 650-13 are bias-ply sizes associated with the model. That aligns with what a restorer would expect on a specialty European-designed car of the mid-1960s sold into enthusiast markets before radial fitments became universal in every segment. The exact as-delivered size can depend on the car's individual history, wheel setup, and market details, so both size and appearance deserve a close look.

If originality is the goal, start by examining surviving wheels, period photos, old service records, and the tire size history already on the car. Then compare those clues with the rim-width requirements for 640-13 and 650-13. Avoid assuming that every Amphicar left the factory in identical cosmetic trim after decades of restoration and ownership changes. For a judging-level restoration, a marque club or Amphicar specialist remains the best final check on size and whitewall presentation.

Correct tire fitment matters a great deal when showing a 1967 Amphicar because judges and knowledgeable enthusiasts often notice size, construction type, and sidewall style immediately. On a car this unusual, tires are part of the visual story, and an obviously mismatched size or an out-of-period sidewall treatment can pull attention away from an otherwise careful restoration. Since both 640-13 and 650-13 are bias-ply sizes, the remaining authenticity questions often center on wheel-width correctness and whitewall presentation.

A show-oriented Amphicar benefits from consistency between the tire size, the wheel it is mounted on, and the era-correct visual tone of the car. Wide whitewalls and narrow whitewalls create different impressions, and the right answer depends on the restoration target rather than personal taste alone. If the car will be judged, check event standards and consult Amphicar specialists before final selection. That extra step can prevent a small tire-detail mismatch from becoming a visible deduction.

For the 1967 Amphicar, Coker Classic and US Royal both offer 650-13 bias-ply tires with the same 13-inch rim diameter, the same 4.50 to 5.00 inch rim-width range, and the same 1150-pound load rating at 32 psi. Each brand is available in both wide whitewall and narrow whitewall form, and the recorded tire weight is 18 pounds across those versions. In practical spec terms, these 650-13 choices are very close to one another.

That means the selection between Coker Classic and US Royal is more likely to come down to brand preference and the exact whitewall look you want than to a major difference in fit or load capability. On an Amphicar, visual harmony matters, so compare the whitewall width to the personality of the restoration rather than expecting one of these 650-13 options to solve a mechanical fitment issue the other cannot. The wheel-width requirement is the same for both.

1967 Amphicar tires can be suitable for normal road use when they are the correct size for the wheel, properly inflated, and in sound condition. The available 640-13 product carries an S speed rating, which corresponds to 112 mph. The 650-13 products do not show a speed letter in the size marking here, so the safest approach is to confirm the sidewall marking on the exact tire before extended highway use. On a mid-1960s collector vehicle, tire condition often matters more in practice than theoretical top-speed capability.

An Amphicar's age, steering feel, braking system, suspension condition, and the owner's comfort level usually set the real highway pace well before any enthusiast approaches the upper edge of a vintage tire's rating. What matters most is that the tire matches the wheel correctly and has no age-related defects. Before road use, inspect the sidewalls, verify pressure, and make sure the car tracks and brakes as it should. A fresh, correctly fitted bias-ply tire is only one part of safe operation.

The current load-and-pressure figures attached to 1967 Amphicar tire options are specific to each size. The 640-13 carries 1045 pounds at 32 psi, while the 650-13 carries 1150 pounds at 32 psi. Those figures describe the tire's rated load at that pressure, not necessarily the exact running pressure the car should use in every situation. Factory vehicle recommendations and the tire manufacturer's guidance both matter when setting final pressure.

The safest approach is to use the owner's manual or marque literature for the Amphicar's intended operating pressure, then compare that with the tire maker's rating information for the exact tire you are using. Do not transfer a pressure assumption from 650-13 to 640-13 or vice versa simply because both mount on 13-inch wheels. If the car feels unsettled, wanders, or rides harshly, pressure and wheel-size matching are two of the first things worth rechecking.

Before taking a 1967 Amphicar on a longer drive, inspect every tire for cracks, cuts, bulges, uneven wear, and stable inflation. Confirm that the tires match the wheel width correctly, and check the condition of the spare as carefully as the four on the ground. Valve stems and wheel condition deserve attention too, especially on a specialty collector car that may have spent long periods parked. A tire that looks good from a few feet away can still deserve a closer inspection.

Treat tire inspection as one part of a broader pre-drive routine that also includes brakes, steering, fluids, lights, and basic roadworthiness. Amphicars are charming machines, but they are still vintage vehicles with vintage needs, and long drives reward preparation. If the tires are older, recently mounted, or new to the car, take a short shakedown run before committing to a full outing. That gives you a chance to catch pressure loss, vibration, or fitment concerns while still close to home.