1965 BMW 2600 Tires

The 1965 BMW 2600 uses two primary tire sizes: 185R15 in radial construction and 640-15 in bias-ply construction. Both sizes are associated with a 15-inch rim, so the fitment decision is centered on construction type and tire style rather than a change in wheel diameter.

That means the right choice depends on how the car is equipped and how you want it to present on the road. A radial path can suit owners seeking a classic European radial format, while the bias-ply size keeps a more traditional vintage appearance. Before choosing, confirm the actual wheel width on the car and make sure any past wheel or suspension changes have not altered clearance.

The 1965 BMW 2600 uses a 15-inch rim diameter with both of its primary tire fitments. That applies whether the car is running the 185R15 radial size or the 640-15 bias-ply size, so the wheel diameter remains consistent across the available fitment paths.

Rim diameter is only one part of the fitment picture, though. Wheel width still matters, especially when comparing bias-ply tires with radial alternatives or evaluating modern equivalent sizes for 640-15. A good next step is to inspect the wheel itself for width and type, particularly if the car has been restored, modified, or fitted with replacement wheels at some point in its life.

The covered 1965 BMW 2600 Series fitment is shared rather than split by different sub-model tire sizes. The available primary fitments are the same two 15-inch choices: 185R15 in radial construction and 640-15 in bias-ply construction.

Since the sub-model does not create a separate size break, the real decision is selecting the tire type that matches the car's current wheels and your intended result. Owners focused on a traditional presentation may lean toward the numeric bias-ply size, while others may prefer the radial format. It is still smart to verify what is currently mounted, because older collector cars are often running tires fitted many years after new.

On the 1965 BMW 2600, 640-15 is a bias-ply tire size. It uses the vintage numeric sizing system, and the available products in that size follow the traditional bias-ply construction rather than a modern radial construction.

That matters because a bias-ply tire affects both appearance and fitment choices. The available 640-15 selection includes blackwall, narrow whitewall, and wide whitewall styles, which can make a noticeable difference on a restored sedan. If you are comparing it to a radial alternative, verify wheel width and overall setup first instead of assuming that any 15-inch radial will behave the same on the car.

Radial equivalents for 640-15 include 175R15 as the 80-series metric radial option, P175/75R15 as the 75-series P-metric radial option, and P185/70R15 as the 70-series P-metric radial option. These are the stated radial alternatives tied to the original 640-15 bias-ply size.

Each equivalent keeps the 15-inch wheel diameter but uses a different sizing convention and profile family, so they should be treated as alternatives rather than automatic substitutes. A 5-6 inch rim-width range is associated with these equivalents, making wheel width an important checkpoint. It also helps to compare the car's current wheel setup and available clearance before moving from a bias-ply fitment to any radial equivalent.

Start by confirming the exact size you are converting from and the wheel dimensions on the car. For a 640-15 bias-ply fitment, the radial-equivalent choices include 175R15, P175/75R15, and P185/70R15, and the associated rim-width range is 5-6 inches.

Beyond size, inspect the car's actual wheel width, steering clearance, suspension condition, and fender clearance before making the change. A collector BMW may also have replacement wheels or ride-height changes that affect fitment even when the rim diameter is still 15 inches. The safest approach is to compare the new tire choice against the car as it sits today rather than relying only on the original size convention.

The first consideration is whether your BMW 2600 is best served by the 185R15 radial fitment or the 640-15 bias-ply fitment. From there, compare the wheel dimensions on the car, the construction type you want, and the visual style that suits the car's overall presentation.

Product choice then comes down to the details that actually separate one tire from another, such as sidewall treatment, tire series, rim-width specification, and load-related figures where stated. A blackwall radial and a wide whitewall bias-ply create very different results even on the same car. Picking the right tire is really about matching fitment, appearance, and intended driving use instead of focusing on size alone.

The 1965 BMW 2600 has a broad sidewall selection across its available tires. Depending on size and construction, choices include blackwall, narrow whitewall, wide whitewall, and redline styles, with those options spread across both radial and bias-ply offerings.

That gives the car very different visual personalities without changing the basic year-make-model fitment. A blackwall usually keeps the look restrained, while whitewall versions create a more formal vintage presentation and redlines add a sportier period-style accent. The right sidewall is often the one that matches the car's restoration direction and existing trim, rather than the one that simply appears most dramatic in isolation.

Tires for the 1965 BMW 2600 are available from several brands, including Coker Classic, Michelin, Avon, Universal Vintage Tire, BFGoodrich, Firestone, and Excelsior. Those brands appear across the two primary fitment paths, with radial choices in 185R15 and bias-ply choices in 640-15.

Brand is only one part of the decision, since the offerings also differ by tire series, sidewall style, and wheel-width compatibility. Michelin and Avon appear in the radial side of the selection, while BFGoodrich, Firestone, Avon, and Excelsior appear in the bias-ply range. It helps to compare each tire in the context of the look you want and the wheel setup the car is actually using.

A period-style 1965 BMW 2600 can be approached from two directions. The 640-15 bias-ply size gives the car a more traditional vintage presentation, while the 185R15 radial keeps the fitment in a classic Euro-metric format that also suits the era of the car.

The better choice depends on the type of restoration and the road use you have in mind. Sidewall treatment also changes the visual result significantly, with blackwall, whitewall, and redline options creating very different impressions. When exact historical originality matters, it is worth checking BMW marque references or restoration records for your particular car before deciding on the final construction and sidewall style.

Tire construction changes the visual character of a restored 1965 BMW 2600 more than many owners expect. A 640-15 bias-ply gives the car a distinctly traditional look, while a 185R15 radial presents the car in a more European touring-oriented style within the same 15-inch wheel diameter.

Sidewall selection adds another layer to that decision. Wide whitewalls and narrow whitewalls can make the car feel more formal and period-focused, while blackwalls keep the look understated and redlines add a more assertive accent. Because tire choice is so visible on a mid-1960s sedan, construction should be treated as part of the restoration plan rather than as a purely mechanical purchase.

Yes, modifications can affect tire fitment on a 1965 BMW 2600 even when the car still uses a 15-inch wheel. Changes to wheel width, wheel offset, suspension height, steering components, or body clearance can all influence how a 185R15 radial or 640-15 bias-ply sits and operates on the car.

That is especially important on an older car that may have seen decades of repairs and upgrades. Replacement wheels may not match original dimensions, and suspension work can change available clearance at full lock or over bumps. Before installing new tires, inspect the current setup carefully and compare the intended size and construction to the car as it exists now, not only to what it may have used originally.

Before road use, inspect the tires for proper inflation, seating on the wheels, and any signs of shipping or installation damage. It is also smart to check for adequate clearance at the fenders and steering components, especially if the 1965 BMW 2600 has replacement wheels or is changing from one construction type to another.

A broader pre-drive check matters just as much on a collector sedan. Look over wheel hardware, valve stems, suspension condition, and basic alignment behavior once the car is moving. Even with new tires installed, an older car can still have aged bushings, steering play, or brake issues that affect confidence on the road. A short local test drive is a better first step than heading straight onto a long trip.

Collector-car tire maintenance starts with regular inspection, proper inflation, and attention to aging as much as tread wear. On a 1965 BMW 2600, whether it is running 185R15 radials or 640-15 bias-ply tires, long periods of storage can be just as important as mileage in determining overall tire condition.

Check the tires periodically for cracking, flat spotting, bulges, cuts, and slow air loss, and inspect them before any extended drive. Storage conditions matter too, since prolonged sunlight, heat, moisture, and ozone sources can shorten tire life on a low-use car. Rotating road use with routine inspection helps catch problems early, particularly on a vintage sedan that may spend more time parked than driven.