1963 BMW 2600 Tires

The 1963 BMW 2600 uses two primary 15-inch tire sizes: 185R15 in radial construction and 640-15 in bias-ply construction. Both sizes are associated with the BMW 2600 Base, so the fitment question is really about which construction and tire style suit the car rather than choosing between different wheel diameters.

That distinction matters because a 185R15 radial and a 640-15 bias-ply do not represent the same tire design philosophy, even though they share a 15-inch rim diameter. Before choosing one, confirm the actual wheel width on the car and decide whether the goal is a traditional period-style look, a radial driving experience, or a balance between vintage appearance and regular road use.

The 1963 BMW 2600 uses a 15-inch rim diameter with both of its primary tire fitments. The radial 185R15 and the bias-ply 640-15 are both built around that same 15-inch wheel diameter, which simplifies one part of the selection process compared with vehicles that used multiple rim diameters.

Rim diameter is only the starting point, though. Width still matters, especially if the car has replacement wheels or if a switch from 640-15 bias-ply to a radial equivalent is being considered. Measuring the wheel already on the car and comparing it to the tire’s approved rim-width range is a smart step before committing to a specific tire style or construction.

640-15 is a vintage numeric bias-ply size. The 640 portion represents an approximate 6.40-inch nominal section width, and the 15 identifies the wheel diameter in inches. On a 1963 BMW 2600, it refers to a traditional bias-ply tire format rather than a modern metric radial size.

Understanding that format helps when comparing it to the car’s 185R15 radial option or to radial equivalents such as 175R15 and P175/75R15. The number sequence does not translate directly to modern metric sizing, so a buyer should compare construction type, wheel width, and intended appearance instead of assuming that similar-looking numbers mean the tires behave or fit the same way.

640-15 is a bias-ply tire size for the 1963 BMW 2600. It represents the traditional construction option for this car, while 185R15 serves as the radial fitment. The two sizes share a 15-inch rim diameter, but they are different tire formats with different construction characteristics and visual presentation.

That makes the choice about more than size alone. A 640-15 bias-ply typically suits a more traditional restoration-oriented appearance, while a radial path may appeal to owners who prioritize a more modern touring-style setup. Wheel width, vehicle stance, and the car’s current suspension and clearance should all be reviewed before changing from one construction type to the other.

Radial equivalents for 640-15 include 175R15 as an 80-series metric radial, P175/75R15 as a P-metric 75-series radial, and P185/70R15 as a P-metric 70-series radial. No bias-look radial equivalent is associated with this size, so the available alternatives move the BMW 2600 into conventional radial sizing formats.

Those equivalent sizes offer different profile conventions rather than automatic interchangeability with the original bias-ply tire. The recommended rim-width range tied to these equivalents is 5 to 6 inches, which makes wheel-width confirmation especially important. Clearance around the fenders and suspension should also be checked carefully anytime the car is being converted from its original-style numeric bias-ply sizing.

Either can be appropriate on a 1963 BMW 2600 because both a 640-15 bias-ply and a 185R15 radial are established fitments for the car. The better choice depends on what matters most to the owner: traditional presentation and vintage construction, or a radial setup that aligns more closely with later road-use expectations.

Appearance often guides the decision as much as construction. A wide whitewall or blackwall 640-15 can support a more period-style look, while 185R15 radial options broaden the choices in blackwall, redline, and narrow whitewall form. Matching the tire to the wheel on the car, the way the BMW is driven, and the overall restoration goal will usually point to the right direction.

Start with the two primary fitments: 185R15 radial and 640-15 bias-ply. From there, the main considerations are construction type, wheel compatibility, sidewall style, and whether the car is being maintained as a restoration-minded sedan or driven regularly enough to make radial options more attractive.

It also helps to compare the tire series and technical details behind each option rather than choosing by appearance alone. Some tires have different approved rim-width ranges, weights, and load figures, and those details can matter on a heavy vintage European sedan. Choosing carefully means balancing the look you want with the wheel and use requirements of the particular car.

1963 BMW 2600 tires are available in several sidewall styles, including blackwall, redline, narrow whitewall, and wide whitewall. The available style depends on the tire size and construction you choose. The 185R15 radial offerings include blackwall, redline, and narrow whitewall options, while 640-15 bias-ply choices add both narrow and wide whitewall treatments.

That variety makes sidewall selection one of the biggest appearance decisions on this car. A blackwall usually delivers the most restrained and understated look, while redline and whitewall options shift the car’s visual character noticeably. Sidewall style should be chosen after the correct size and construction are settled, since not every finish is available in both the radial and bias-ply fitments.

The 1963 BMW 2600 has tire options from Coker Classic, Michelin, Avon, Universal Vintage Tire, BFGoodrich, Firestone, and Excelsior. Those brands are spread across the car’s two primary fitments, with radial choices concentrated in 185R15 and bias-ply selections concentrated in 640-15.

Brand should be viewed as one part of the decision rather than the whole answer. It is more useful to compare each brand’s available tire series, construction type, sidewall style, and rim-width requirements within the size you plan to run. That approach keeps the selection focused on what actually suits the BMW 2600 instead of reducing the choice to a logo on the sidewall.

A period-style 1963 BMW 2600 usually starts with the 640-15 bias-ply size because it preserves a traditional vintage tire format and offers blackwall, narrow whitewall, and wide whitewall presentations. That size gives the car an earlier visual character than a modern-looking radial fitment, even though the BMW 2600 can also use 185R15 radials.

The exact sidewall and brand choice depends on how closely the car is being restored and what appearance you want to emphasize. For owners chasing strict historical accuracy, marque-club references and vehicle-specific documentation remain important, since a period-style tire is not automatically the same thing as the exact tire originally delivered on an individual car.

Tire construction changes the look of a restored 1963 BMW 2600 in subtle but important ways. A 640-15 bias-ply tends to preserve a more traditional vintage presentation, while a 185R15 radial gives the car a later-style visual impression even when it is offered in vintage-oriented sidewall treatments such as redline or narrow whitewall.

That means appearance decisions should be made alongside fitment decisions, not afterward. Owners restoring the car for shows, marque events, or a distinctly period-minded look often place more value on the bias-ply format itself, while others prefer the cleaner touring feel of a radial. Sidewall choice then fine-tunes the look once the construction direction has been settled.

Yes, modifications can affect tire fitment on a 1963 BMW 2600 even when the tire size itself is correct. Aftermarket wheels, changes in wheel width, altered ride height, suspension work, or body repairs around the wheel openings can all influence how a 185R15 radial or 640-15 bias-ply sits and clears under the car.

A modified car should be checked at full steering lock and through normal suspension movement before settling on a new tire. The 15-inch rim diameter may stay the same, but width and offset changes can still alter the result. Any time the BMW has moved away from stock-style wheels, measuring the actual setup becomes more important than relying on size alone.

Before driving a 1963 BMW 2600 on new tires, inspect the wheels for correct diameter and width, confirm that the tires are properly seated, and check inflation against the tire’s service requirements. It is also wise to look over valve stems, wheel hardware, and visible suspension or steering components while the car is already being serviced.

A short test drive should be followed by another walk-around to make sure there is no rubbing, unusual air loss, or uneven contact pattern. On a collector sedan that may sit for long periods, tire condition should remain part of routine upkeep even when tread looks fresh. Cracking, bulges, cuts, and changes in ride feel all deserve prompt attention.

Tires on a collector 1963 BMW 2600 should be maintained with regular pressure checks, visual inspections, and careful storage habits. Even a lightly used car can develop tire issues over time, so tread depth alone is not enough. Sidewalls should be checked for cracking, cuts, bulges, and signs of age-related deterioration.

Storage conditions matter as much as mileage on a vintage BMW. Keeping the car away from prolonged sunlight, moisture, heat, and ozone sources helps preserve the tires between drives. It is also smart to inspect the tires before any longer outing, especially if the car has been parked for extended periods, because flat spotting or gradual air loss can appear without much warning.