1968 Triumph 2000 Tires

A 1968 Triumph 2000 uses two primary tire sizes on 13-inch rims: 175R13 in radial construction and 650-13 in bias-ply construction. Those are not just alternate labels for the same tire, but two fitment paths that reflect different construction types and buying priorities for this exact car.

The practical choice comes down to how the car is set up and how it will be used. A restoration-oriented owner may prefer the traditional 650-13 bias-ply size, while a road-use-minded owner may look first at the 175R13 radial size or a radial equivalent tied to 650-13. Wheel width, clearance, and the car's present wheel and suspension condition should be checked before changing construction.

The 1968 Triumph 2000 uses a 13-inch rim diameter with both of its primary tire sizes. That applies to the 175R13 radial fitment and the 650-13 bias-ply fitment, so the basic wheel diameter remains consistent even though the tire construction and sizing format differ.

Rim diameter is only part of the fitment picture, especially when moving between bias-ply and radial options. The actual wheel on the car should still be checked for width and overall suitability before selecting a tire. That matters even more if the Triumph has had wheel changes over the years, since a 13-inch diameter alone does not confirm full compatibility.

Yes. The 1968 Triumph 2000 Sport uses the same tire-size range as the model-level fitment, with 175R13 in radial form and 650-13 in bias-ply form. That keeps the Sport sub-model within the same 13-inch tire decision rather than introducing a separate wheel diameter or an additional size family.

That shared fitment makes selection simpler, but it does not remove the need to verify the car's current setup. If the Sport has been restored, modified, or changed to different wheels, the final tire choice should still be matched to actual wheel width and intended appearance. Construction choice remains the key decision rather than sub-model-specific sizing.

On the 1968 Triumph 2000, 650-13 is the bias-ply tire size. It uses the older numeric sizing format, where the 6.50 figure refers to nominal section width in inches and the 13 identifies the wheel diameter. The radial primary size associated with this car is 175R13, not 650-13.

That distinction matters because a bias-ply tire affects both appearance and setup choice. The available 650-13 products are traditional bias-ply whitewall tires, which suit owners aiming for a period-style look. Anyone considering a shift away from bias-ply should compare wheel width, tire dimensions, and overall vehicle clearance rather than assuming every radial-marked alternative will suit the car automatically.

Radial equivalents for 650-13 include 175R13 as an 80-series metric radial, P175/75R13 as a P-metric 75-series radial, P185/70R13 as a P-metric 70-series radial, and 650R13 as a bias-look radial. Each one relates back to the original 650-13 fitment in a different sizing format or profile style.

Those choices give a 1968 Triumph 2000 owner several ways to move from traditional bias-ply sizing into radial construction. The recommended rim-width range for these equivalents is 4 to 6 inches, but the decision should also account for actual wheel width, overall proportions, and available clearance around the body and suspension. Equivalent does not mean automatic interchangeability on every individual car.

Start by confirming the wheel diameter and actual wheel width on the car, then compare the intended radial size with the original 650-13 fitment path. For 650-13, the available radial-equivalent range includes 175R13, P175/75R13, P185/70R13, and 650R13, with a recommended rim-width range of 4 to 6 inches.

A conversion also calls for a careful look at clearance and condition. Steering travel, fender space, suspension wear, and any previous wheel changes can influence whether a radial alternative is suitable for the car. The owner should also decide whether the goal is a clearly modern radial presentation or a more traditional look through a bias-look radial such as 650R13.

The main considerations are construction, appearance, and wheel compatibility. For a 1968 Triumph 2000, 650-13 is the bias-ply size, so choosing within that fitment means comparing period-style presentation, sidewall treatment, and the tire series offered in that exact size rather than deciding between unrelated modern sizes.

Coker Classic and US Royal both offer 650-13 options, and the visible difference is largely in narrow whitewall versus wide whitewall styling. Rim-width suitability also matters, since the available 650-13 products are built around a 4.50 to 5.00 inch wheel width range. That combination of visual style and wheel match is what usually separates one 650-13 choice from another.

For the available 650-13 tires used on a 1968 Triumph 2000, the sidewall styles are narrow whitewall and wide whitewall. Those styles appear within traditional bias-ply offerings, giving the car two distinct whitewall presentations while staying within the correct vintage size family and 13-inch rim fitment.

Sidewall choice has a strong effect on the car's overall character, especially on a late-1960s British sedan where the tire is highly visible in profile. A wider whitewall pushes the look further toward period styling, while a narrower whitewall is more restrained. The choice should complement the car's restoration direction rather than trying to suggest one universal appearance rule.

Coker Classic and US Royal offer tires in the available 650-13 fitment for the 1968 Triumph 2000. Both brands appear in classic bias-ply form and both offer whitewall variations, so the comparison is less about finding a single correct brand and more about selecting the presentation that matches the car.

A useful way to compare them is by looking at the tire series and sidewall treatment rather than by chasing brand name alone. Coker Classic Bias Ply and US Royal Classic Bias Ply each support a traditional look, with narrow and wide whitewall choices available. The final decision should still stay tied to correct size, wheel width, and intended use.

For a period-style 1968 Triumph 2000, the 650-13 bias-ply size is the natural starting point because it preserves the traditional sizing format and supports classic whitewall presentations. That makes it the better fit for owners who want the car to retain a distinctly vintage look rather than shifting immediately toward a modern radial appearance.

Within that size, the choice becomes one of visual treatment and restoration character. Coker Classic and US Royal both offer 650-13 bias-ply options, and the sidewall can be selected in narrow whitewall or wide whitewall form. When exact originality matters, period photos, marque references, and vehicle-specific historical records remain the best final check.

Tire construction changes more than ride feel on a restored 1968 Triumph 2000; it also changes the visual language of the car. A 650-13 bias-ply tire presents the car in a more traditional way, while a radial such as 175R13 or a radial equivalent tends to move the appearance toward a later, more modern tire profile.

That is why construction should be treated as part of the restoration plan rather than a separate technical decision. A bias-look radial like 650R13 can be useful when the goal is to keep a more vintage presentation while considering radial construction. The best choice depends on whether authenticity of appearance or broader road-use priorities carries more weight for the owner.

Yes. Modifications can affect tire fitment on a 1968 Triumph 2000 even when the car still uses a 13-inch wheel. Changes such as aftermarket wheels, different wheel widths, suspension alterations, ride-height changes, or bodywork differences can all influence whether a 650-13 bias-ply tire or a radial alternative has the right clearance.

That is especially important when comparing the original-style 650-13 with radial-equivalent options such as 175R13, P175/75R13, P185/70R13, or 650R13. The owner should inspect steering clearance, fender space, and wheel dimensions on the actual car before mounting tires. A modified chassis can change the fitment picture even when the nominal rim diameter remains the same.

Before driving a 1968 Triumph 2000 on new tires, inspect the wheels for the correct 13-inch diameter and appropriate width, then check that the tires seat properly and clear the body and suspension through steering travel. The owner should also confirm there are no issues with cuts, bulges, air loss, or visible installation irregularities.

A collector car benefits from a broader walk-around before road use. Tire pressure, wheel hardware condition, and suspension health all deserve attention, especially if the car has spent long periods parked. Early miles after installation should be treated as a fitment check, with close attention paid to rubbing, vibration, or any sign that the tires do not suit the current setup.

650-13 tires on a collector 1968 Triumph 2000 should be kept properly inflated, inspected regularly for cracking, cuts, bulges, tread wear, and air loss, and protected from long idle periods in harsh storage conditions. Collector vehicles often age tires by time and environment as much as by mileage, so visual condition matters every bit as much as tread depth.

Storage habits play a large role in preserving a vintage tire setup. Keeping the car away from prolonged sunlight, moisture, heat, and ozone sources can help maintain sidewall condition over time. Regular inspection is especially important with a bias-ply fitment, since many collector cars see intermittent use and can develop age-related issues before those problems are obvious on the road.