1958 Rover 75, 90, 105R & 105S Tires

The 1958 Rover 75, 90, 105R & 105S uses two primary tire sizes: 175R15 in radial construction and 600-15 in bias-ply construction. Both sizes are built for a 15-inch rim, so the main difference is the sizing system and tire construction rather than wheel diameter.

Choosing between them starts with confirming how the car is currently set up. A Rover kept in traditional form may stay with the 600-15 bias-ply, while a car already using radial-type fitment may point toward 175R15. Wheel width, tire clearance, and any previous changes to wheels or suspension are worth checking before selecting a replacement.

Both primary tire sizes for the 1958 Rover 75, 90, 105R & 105S are built around a 15-inch rim diameter. That applies to the 175R15 radial and the 600-15 bias-ply, so rim diameter does not change between the listed fitment paths.

Rim diameter is only one part of the fitment picture, especially on a collector car that may have been altered over the years. It still helps to measure the actual wheel on the car and confirm width as well, since bias-ply and radial choices can call for different wheel-width considerations even when the diameter remains 15 inches.

Yes. The 1958 Rover 75, 90, 105R & 105S Base uses the same primary tire choices found on this Rover fitment range: 175R15 in radial construction and 600-15 in bias-ply construction. The sub-model does not introduce a separate rim diameter or a unique size of its own here.

That makes the decision more about construction and appearance than trim-level differences. A buyer should confirm whether the car is presently on radial or bias-ply tires, then compare wheel width, overall tire stance, and intended use. On a restoration-minded car, sidewall style can matter almost as much as the size itself.

For the 1958 Rover 75, 90, 105R & 105S, 600-15 is a bias-ply tire size. It uses the older numeric sizing format and is the traditional-style fitment option in this application, while 175R15 represents the radial fitment path.

That distinction matters because construction influences both the tire's appearance and how the car is set up. Owners keeping a period-style presentation often stay with the 600-15 bias-ply, while those considering a change should confirm wheel width, clearance, and overall compatibility before moving from a bias-ply setup to any radial alternative.

Radial equivalents for 600-15 include 165R15, P165/75R15, and P175/70R15. Those represent three different formats: an 80-series metric radial, a P-metric 75-series radial, and a P-metric 70-series radial. No bias-look radial equivalent is listed for this size.

These alternatives give a buyer several ways to compare a modern radial against the original bias-ply size, but they should not be treated as automatic substitutes. The associated rim-width range is 4 to 5 inches, and it is still important to verify wheel width, physical clearance, and the car's actual setup before making a change.

Start by confirming which bias-ply size is on the car and which radial equivalent is being considered. For a 600-15 Rover, the listed radial alternatives are 165R15, P165/75R15, and P175/70R15, and the associated recommended rim-width range is 4 to 5 inches.

A careful conversion check should include the wheel's actual width and diameter, the tire's clearance at the fender and steering components, and the condition of suspension and steering parts. Cars that have sat for long periods or carry non-original wheels deserve extra scrutiny, since small setup changes can affect how a radial alternative works in practice.

The first decision is whether the car should stay with a 600-15 bias-ply tire or use the 175R15 radial fitment path. Both use a 15-inch rim, but they differ in sizing format, construction, and the kind of presentation they give the car.

After the size and construction are settled, compare the details that shape the finished result. A restoration-oriented owner may focus on a traditional sidewall look, while a road-use owner may be more concerned with current wheel setup and compatibility. Existing wheel width, tire age, and any past modifications deserve as much attention as the size code.

In the available 600-15 bias-ply products for the 1958 Rover 75, 90, 105R & 105S, sidewall choices include blackwall and a 2.625-inch wide whitewall. Both are offered within the BFGoodrich Silvertown Classic Bias Ply line, so the sidewall treatment becomes a meaningful appearance decision within the same general tire family.

That choice affects the car's visual character more than its basic fitment. A blackwall tends to keep the presentation restrained and understated, while a wide whitewall creates a more formal period look. The better option depends on the Rover's restoration direction, wheel presentation, and how closely the owner wants the finished stance to reflect a traditional 1950s appearance.

The available 600-15 bias-ply options for the 1958 Rover 75, 90, 105R & 105S come from BFGoodrich. Those tires are part of the Silvertown Classic Bias Ply series and are offered with different sidewall treatments rather than through a broad multi-brand assortment in this size.

Since the visible brand choice is narrow here, selection depends more on the tire's presentation and wheel-width match than on comparing manufacturers. It helps to look closely at blackwall versus wide whitewall styling, confirm which rim-width range suits the wheel on the car, and decide whether a traditional bias-ply construction still matches the Rover's intended use.

A period-style approach for a 1958 Rover 75, 90, 105R & 105S usually starts with the 600-15 bias-ply size. Its vintage numeric format and bias-ply construction align naturally with the car's era, making it the most traditional-looking choice among the listed fitments for a restoration-minded owner.

Appearance goals still matter within that size. A blackwall gives a simpler, more restrained look, while the 2.625-inch wide whitewall creates a more formal presentation. When exact originality is important, compare the tire choice with marque references or period photographs, because a period-style tire is not automatically the same thing as a proven factory-original specification.

Tire construction changes the overall visual impression of a restored 1958 Rover 75, 90, 105R & 105S. A 600-15 bias-ply generally supports a more traditional presentation that suits the car's late-1950s character, while a 175R15 radial gives the Rover a more modern tire identity even though it still uses the same 15-inch rim diameter.

That difference is often most noticeable in the tire's stance and the way the sidewall looks with the car's body and wheel openings. Owners restoring for display often weigh that visual effect heavily, while road-use owners may accept a more modern look. The right answer depends on whether historical character or a radial-style setup is the stronger priority.

Yes. Modifications can change tire fitment on a 1958 Rover 75, 90, 105R & 105S even when the nominal tire size remains 175R15 or 600-15. Aftermarket wheels, altered wheel width, suspension changes, or body and fender work can all affect how much room the tire has once it is mounted and loaded.

A Rover that has been lowered, fitted with different wheels, or rebuilt with non-original parts should be checked carefully before a replacement tire is chosen. The most useful checks are wheel diameter and width, steering clearance at full lock, and space around the fender openings. Collector cars often look stock while carrying meaningful changes underneath.

Before driving a 1958 Rover 75, 90, 105R & 105S on new tires, inspect the wheels for the correct 15-inch diameter and suitable width, then look over the suspension and steering for looseness or wear. It also makes sense to confirm that the tires seat properly and that inflation is consistent from side to side.

A short shakedown inspection is especially helpful on a collector car that may have sat for long periods. Watch for rubbing during turns, unusual vibration, air loss, or any sign that the tire is contacting trim or bodywork. Rechecking pressure and wheel fasteners after the first miles helps catch small setup issues before they become larger ones.

Tires on a collector 1958 Rover 75, 90, 105R & 105S should be kept clean, properly inflated, and inspected regularly for cracking, cuts, bulges, flat-spotting, and slow air loss. Mileage is only part of the picture on a hobby car, since age and storage conditions can matter just as much as tread wear.

Storage habits have a real effect on long-term tire condition. Parking away from prolonged sunlight, moisture, and ozone sources helps preserve the rubber, and moving the car periodically can reduce long-term flat spotting. Before any longer outing, a careful walk-around and pressure check is worthwhile, especially if the Rover is driven only occasionally.