1961 Daimler Tire Fitment Guide

1961 Daimler vehicles use four sizes split by model. The Daimler Majestic uses 185R16 in radial form or 670-16 in bias-ply form, both on 16-inch rims. The Daimler SP 250 uses 165R15 in radial form or 590-15 in bias-ply form, both on 15-inch rims. Rim-width ranges appear on several products: 185R16 commonly fits 4.50 to 6.50-inch rims depending on brand, 670-16 appears on 4.50 to 5.00-inch rims, 165R15 on 4.50 to 6.00-inch rims, and 590-15 on 4.00 to 4.50-inch rims where that information is supplied.

The important takeaway is that year and make alone are not enough for a 1961 Daimler. You need to know whether the car is a Majestic or an SP 250 first, because the wheel diameter changes with the model. After that, the next decision is construction type within the correct size family. Staying within the right rim diameter and an appropriate rim-width range helps preserve proper tire shape and keeps fitment research on the right track before you compare brands or sidewall styles.

On a 1961 Daimler Majestic, 185R16 is a metric radial size. The 185 identifies a nominal section width of 185 millimeters, the R denotes radial construction, and the 16 is the wheel diameter in inches. In a size written this way without a separate aspect-ratio number, the profile is conventionally treated as an 80-series radial. Within this size, blackwall tires are available from Michelin, Avon, and Vredestein, with speed ratings ranging from S to V depending on the product.

That matters because 185R16 is not just a modern-looking code replacing 670-16 at random; it represents the Majestic’s radial alternative on the same basic 16-inch wheel diameter. A Majestic owner comparing the two is really deciding between radial construction and bias-ply construction rather than changing to a different model’s wheel size. It is also wise to check the exact sidewall marking before purchase, since one 185R16 may carry a different speed symbol from another even though the nominal size is the same.

On a 1961 Daimler SP 250, 590-15 is a numeric bias-ply size. The 5.90 indicates the nominal section width in the older numeric system, and the 15 is the rim diameter in inches. In the available SP 250 products, this size comes in blackwall and wide whitewall versions, with BFGoodrich offering the traditional numeric marking and Avon offering a 590H15 variant that adds an H speed rating. That H rating corresponds to a 130 mph ceiling.

For an SP 250 owner, 590-15 points toward a traditional bias-ply presentation rather than the car’s radial alternative. It is the size to consider when the goal is an earlier look and feel on the correct 15-inch wheel diameter. Because the SP 250 is a sports car and some products in this size carry different sidewall markings and speed symbols, checking the exact tire you want is worthwhile before making a final decision about appearance and road use.

That choice applies to the 1961 Daimler Majestic, and both sizes belong on 16-inch wheels. The difference is mainly construction: 185R16 is a radial size, while 670-16 is a bias-ply size. Blackwall options exist in both, and 185R16 comes from Michelin, Avon, and Vredestein, while 670-16 comes from Firestone and Avon. Some 185R16 tires also carry higher speed symbols than some 670-16 offerings, depending on the exact product.

A Majestic owner usually makes this decision by balancing historical presentation with driving expectations. Bias-ply construction keeps the car closer to the way a 1961 luxury saloon would have felt in period, while radial construction is often the path chosen by owners who use their cars more regularly on modern roads. The key is to keep the decision within the Majestic’s own 16-inch fitment family and avoid crossing over to SP 250 sizes, which are built around a different wheel diameter.

Sidewall choices on 1961 Daimler tires depend on model and size. The Majestic’s 185R16 and 670-16 offerings are blackwall. The SP 250’s 165R15 radial choices include blackwall, narrow whitewall, and wide whitewall, while its 590-15 bias-ply choices include blackwall and wide whitewall. That gives the SP 250 owner more freedom to tune appearance within the correct 15-inch size family, while the Majestic stays more restrained in the available sidewall treatments.

For a 1961 British luxury or sports car, blackwall is often the safest path when the goal is a restrained period appearance, especially on the Majestic. Whitewall options can still make sense when a buyer wants a particular restoration look or market-style presentation on an SP 250. Because sidewall style affects appearance much more than basic fitment, it should be chosen after the correct model and size are already settled rather than treated as the starting point.

Several brands cover 1961 Daimler sizes. For the Majestic, 185R16 is available from Michelin, Avon, and Vredestein, while 670-16 comes from Firestone and Avon. For the SP 250, 165R15 is available from Coker Classic, American Classic, Firestone, and BFGoodrich, while 590-15 comes from BFGoodrich and Avon. That spread covers both radial and bias-ply construction, with sidewall options varying by size.

Brand choice on a 1961 Daimler usually comes after the larger fitment decision is settled. A Majestic owner first needs to stay within the 16-inch family, and an SP 250 owner within the 15-inch family; only then does it make sense to compare brand character, sidewall appearance, and speed-symbol differences. Looking at brands size by size is the most useful approach, because the choices available for one Daimler model do not automatically carry over to the other.

Rim-width guidance for 1961 Daimler tires varies by size. The Majestic’s 185R16 radial fits rims from 4.50 to 6.50 inches depending on brand, while 670-16 bias-ply appears on 4.50 to 5.00-inch rims where rim-width guidance is stated. The SP 250’s 165R15 radial commonly fits 4.50 to 6.00-inch rims, and 590-15 bias-ply appears on 4.00 to 4.50-inch rims where that range is given. Those ranges are size-specific and should not be transferred from one Daimler size to another.

That is especially important on a year like 1961, where Daimler split fitment between two very different models. A Majestic wheel setup should be evaluated against Majestic sizes only, and an SP 250 wheel setup against SP 250 sizes only. Even when two tires share the same rim diameter within one model, the approved rim-width range can still differ by construction type or by brand, so comparing the actual wheel against the tire’s published fitment range is a smart final check.

Inner-tube requirements on 1961 Daimler tires depend on the exact size and product. The Majestic’s Michelin 185R16 is marked TT, meaning tube type, while other 185R16 products do not carry the same marking in their visible sidewall description. The 670-16, 165R15, and 590-15 products do not all carry a clear TT or TL notation in the same way, so tube use can vary by product construction and by wheel type. The safest reading is to verify the actual sidewall marking and wheel design before final assembly.

That matters because a tube decision is not just about tire size; it also involves the wheel itself and whether it was designed for tube-type service. On older British cars, original wheel construction can influence the answer just as much as the tire marking does. When fitting a 1961 Daimler, use the exact tire’s marking as the starting point, then confirm whether the wheel and valve-stem arrangement support tube-type or tubeless service before the car goes back on the road.

A 1961 Daimler should be stored in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, welders, and other ozone-producing equipment that can age rubber prematurely. Keep the tires clean, maintain inflation, and avoid letting the car sit for long periods on damp surfaces. Because both Majestic and SP 250 fitments can be bias-ply or radial depending on size choice, storage behavior matters: bias-ply tires generally flat-spot more readily during long static periods than radials.

Owners who store a 1961 Daimler for extended stretches usually benefit from rolling the car periodically or supporting it in a way that reduces long-term stress on one contact patch. A fitted car that never moves can develop flat spotting, sidewall stress, and cosmetic aging long before the tread wears down. Good storage habits protect both appearance and drivability, which is especially important for collector cars that may see only occasional seasonal use.

Tire life on a 1961 Daimler is usually judged by age and condition more than by mileage. Collector cars often cover limited distances, so a tire can look lightly used while still aging out internally. A sensible rule is to inspect more closely once tires reach the five-to-seven-year range and to treat around ten years as the point where replacement deserves serious consideration, regardless of tread depth. The DOT date code on the tire is the reference point for age.

That approach fits how a Majestic or SP 250 is commonly used today. Short drives, long storage periods, and climate exposure can age rubber faster than many owners expect, especially if the car spends time in sun or in a garage with ozone sources. If a 1961 Daimler has old-looking sidewalls, recurring pressure loss, or visible cracking, age has become at least as important as mileage, and replacement planning should move ahead of cosmetic concerns.

Tires on a 1961 Daimler should be inspected before every drive and again before any longer outing. Look for sidewall cracking, tread separation, punctures, bulges, uneven wear, and signs that the tire is not holding pressure correctly. On cars using tube-type tires or wheels that require tubes, the valve stem and any signs of tube-related leakage deserve extra attention. A spare tire should be checked too, since many collector cars still carry an old spare that has aged in place for years.

Frequent inspection matters because a collector Daimler can sit for weeks and then be asked to run at sustained road speed with little warning. Small problems that would show up quickly on a daily driver can stay hidden on a seldom-used car. Making tire inspection part of every pre-drive routine helps catch age, pressure, and sidewall issues early, and it gives the owner time to address them before they become a roadside problem.

For a 1961 Daimler Majestic, bias-ply construction is the historically expected starting point for originality-minded restoration, and 670-16 represents that earlier style within the Majestic’s fitment family. The 185R16 radial is the alternate size used on the same model, but radial adoption in this era was still a transition point rather than a universal assumption across all markets and specifications. No single original-equipment brand should be assumed without market-specific factory literature or marque-club confirmation.

That means a restoration decision on a Majestic should begin with the intended standard of authenticity rather than with brand preference alone. If the car is being judged or restored to a specific delivery-market specification, marque clubs, factory manuals, and period road-test material are the best places to confirm what was typical. For many owners, staying with the correct 16-inch size family and choosing period-appropriate construction is the most important first step toward an authentic presentation.

Correct tire fitment matters a great deal when a 1961 Daimler is judged for authenticity. Size, construction type, sidewall treatment, and overall visual character can all affect how convincing the car looks in period terms. A Majestic shown on a visibly modern radial when the judging standard expects a bias-ply presentation may draw scrutiny, and an SP 250 wearing an overly flashy sidewall treatment can do the same if it does not match the restoration goal or market style.

The practical approach is to decide early whether the car is being restored for concours, club judging, touring, or personal enjoyment. That decision shapes whether you should prioritize period-correct bias-ply construction, a certain sidewall style, or a more forgiving radial alternative. Event standards vary, so owners serious about competition should check with Daimler clubs or the event’s judging rules before finalizing tires, especially when multiple correct-size options exist for the same model.

For a 1961 Daimler SP 250, bias-ply construction is the traditional point of reference for originality, and 590-15 is the period-style size within the SP 250’s own fitment family. The 165R15 radial is the alternate size used on the model, reflecting the broader era when radials were becoming more familiar but had not completely displaced older construction in every market. Original-equipment branding should be verified through SP 250-specific factory literature or marque specialists rather than assumed from present-day reproduction offerings.

Because the SP 250 is a sports car, owners sometimes move quickly toward radial tires without first deciding how original they want the finished car to appear. That is fine for a driver-focused build, but a restoration aimed at period authenticity usually starts with the proper 15-inch bias-ply look and sidewall treatment. If the goal is a judged restoration, confirming market-specific expectations before choosing between 590-15 and 165R15 can prevent an otherwise well-finished car from missing the mark.

1961 Daimler tires can be suitable for highway driving when the correct size, construction, and condition are matched to the car. Some Majestic 185R16 radials carry S and V speed ratings, corresponding to 112 mph and 149 mph, while certain 670-16 and 590-15 bias-ply offerings from Avon carry an H rating with a 130 mph ceiling. Those symbols are useful, but they should be read as tire capability marks rather than a recommendation to drive an early-1960s Daimler at modern high-speed traffic extremes.

On a car of this age, overall mechanical condition matters at least as much as the tire’s speed symbol. Brakes, suspension, steering, wheel condition, and alignment all influence how secure a Majestic or SP 250 feels on the highway. For normal touring use, the bigger safety question is usually whether the tires are fresh, correctly inflated, and properly matched to the model rather than whether the printed speed rating exceeds what the car will realistically see in regular road use.

Inflation pressure for a 1961 Daimler should be tied to the exact tire size and product, not borrowed from another Daimler fitment. Load-and-pressure markings in these sizes include 185R16 at up to 1,433 pounds at 51 psi on one product, 670-16 at 1,130 pounds at 30 psi on one product, 165R15 around 1,168 to 1,170 pounds at 35 to 36 psi on several products, and 590-15 at 1,050 pounds at 32 psi on BFGoodrich examples. Those figures are tire ratings, not blanket vehicle settings.

The best practice is to start with the factory vehicle recommendation in the owner’s literature, then compare it against the reproduction tire’s own rated pressure and construction. A Majestic and an SP 250 should not automatically run the same pressure simply because both are 1961 Daimlers, and a radial should not automatically inherit a bias-ply pressure habit. Matching pressure to the exact model, size, and tire design is one of the simplest ways to improve behavior and protect the casing.

Before a longer drive in a 1961 Daimler, inspect all four tires and the spare for cracking, cuts, bulges, punctures, unusual wear, and correct cold inflation. Check that the sidewalls match the intended fitment for the model, confirm valve-stem condition, and pay extra attention to any tube-type setup or older wheels that may need tubes. On a collector car, the spare and jack arrangement deserve the same attention as the road tires, since they are often untouched for years.

Tires are only one part of the pre-trip checklist, but they are the only part always in contact with the road. A longer outing in a Majestic or SP 250 should also include a broader look at fluids, brakes, steering feel, and wheel security, because age-related problems rarely appear in isolation. Starting with a careful tire inspection reduces the chance that a preventable issue will interrupt the trip or put extra stress on an already elderly chassis.