1971 Simca Tire Fitment Guide

1971 Simca vehicles in this fitment group use two sizes: 155R13 and 560-13, and both apply to the 1971 Simca 1204. Each size mounts on a 13-inch rim, but they are not interchangeable in every wheel-width situation. The 155R13 radial fits rims in the 4.00- to 5.50-inch range, while 560-13 bias-ply products fit narrower ranges depending on brand, including 3.50 to 4.00 inches or 4.00 to 4.50 inches.

That means a 1971 Simca owner should think beyond year and make alone and confirm the actual wheel before settling on one size. If the car is still on a narrow original-style wheel, 560-13 may line up more naturally with that setup. If the wheel width falls within the broader radial range, 155R13 opens the door to a different construction type without changing the 13-inch rim diameter.

On a 1971 Simca, 560-13 is a numeric bias-ply tire size. The 5.60 portion refers to the tire’s nominal section width in inches, with the decimal omitted in the traditional numbering style, and the 13 refers to the wheel diameter in inches. Unlike a modern metric radial code, it does not include an aspect ratio or an explicit radial marker because bias-ply sizing follows an older naming convention.

For a 1971 Simca owner, that size usually points toward an original-era look and feel rather than a modernized driving setup. It is also the size with whitewall choices, including narrow and wide whitewall treatments, so appearance can play a big role in the decision. If the goal is authenticity in stance and sidewall presentation, 560-13 is the size to investigate first.

On a 1971 Simca, 155R13 is a euro-metric radial size. The 155 identifies the nominal section width in millimeters, the R designates radial construction, and the 13 is the wheel diameter in inches. Because no aspect ratio is printed in the size itself, this older metric format is generally treated as an 80-series radial by convention.

That decoding matters because 155R13 represents a different tire era from 560-13 even though both fit 13-inch wheels. A 1971 Simca owner choosing 155R13 is usually selecting a radial-style fitment with blackwall appearance and H-rated options. It is a good path to explore when the goal is to keep the car on a period-appropriate wheel diameter while moving away from bias-ply construction.

The choice between 155R13 and 560-13 on a 1971 Simca is mainly a choice between radial and bias-ply construction. Both sizes mount on 13-inch rims, but 155R13 is the radial option and 560-13 is the bias-ply option. The radial side comes in blackwall form, while the bias-ply side brings whitewall choices that can shift the car’s visual character toward a stronger early-1970s presentation.

A 1971 Simca used for shows, period-style presentation, or a restoration-centered build will often lean toward 560-13. A car that sees more routine road miles may push an owner toward 155R13 because the tire category itself is more modern in character. The right answer comes from balancing originality, appearance, and the wheel width already on the car rather than treating one size as universally correct.

1971 Simca tires are available in more than one sidewall style. The 155R13 radial choices are blackwall tires, while the 560-13 bias-ply choices include both narrow whitewall and wide whitewall versions. That split is useful because it separates the more understated radial look from the more overtly period-styled bias-ply presentation.

For most 1971 Simca owners, sidewall style is not just cosmetic; it changes how original or how updated the car feels at a glance. Blackwalls usually suit a cleaner, more utilitarian import look, especially with radial construction. Whitewalls make a stronger vintage statement, but the best width for authenticity can vary with market, trim presentation, and restoration goals, so serious show cars benefit from checking marque-specific references before finalizing the look.

1971 Simca vehicles are covered by four brands across the two sizes used on the 1204. The 155R13 radial is available from Michelin and Dunlop, while the 560-13 bias-ply is available from BFGoodrich and Firestone. That gives the car a mix of European-style radial options and classic American-brand bias-ply offerings within the same 13-inch fitment family.

Brand choice on a 1971 Simca often follows the broader direction of the build. Owners seeking a European-flavored radial fitment may naturally focus on Michelin or Dunlop, while owners emphasizing classic styling details may look harder at BFGoodrich or Firestone in the 560-13 size. Once the size and construction are settled, brand becomes a matter of sidewall look, series character, and wheel-width compatibility.

Rim width requirements for 1971 Simca tires depend on the size and, in the case of 560-13, sometimes the brand. The 155R13 radial fits 4.00- to 5.50-inch rims. The 560-13 bias-ply appears in narrower ranges, including 3.50 to 4.00 inches for BFGoodrich versions and 4.00 to 4.50 inches for the Firestone version, while all of them share a 13-inch rim diameter.

That makes actual wheel measurement an important step before changing sizes or construction types on a 1971 Simca. A wheel that suits one 560-13 product may sit at the edge of another product’s approved range, and a radial conversion should not be assumed simply because the diameter matches. Confirming the wheel width first helps avoid a mismatch in section profile, sidewall shape, and intended mounting range.

Inner-tube status on 1971 Simca tires depends on the specific product and size. One 155R13 radial carries a TL marking, which identifies it as tubeless, while another 155R13 product does not present the same marking in the size designation. The 560-13 bias-ply products shown here do not all carry explicit tube markings in the size field, so tube decisions should be confirmed against the exact tire and the wheel being used.

The practical issue is that tire construction and wheel design are only part of the picture on a 1971 Simca. Older wheels, restoration goals, and the tire’s own sidewall marking all influence whether a tube is appropriate. Check the exact product marking and inspect the wheel condition before assembly so the final setup matches both the tire design and the wheel’s intended service.

A 1971 Simca can use both 155R13 and 560-13 on 13-inch wheels, so the rim diameter itself does not create a conflict between the two sizes. The more important question is wheel width. The radial 155R13 wants a 4.00- to 5.50-inch rim, while 560-13 bias-ply options occupy narrower width ranges depending on the product.

That means some original 1971 Simca wheels may be suitable for both sizes, while others may be a better match for only one construction path. A careful owner should measure the wheel before switching from bias-ply to radial or from one 560-13 brand to another. Diameter compatibility is straightforward here; width compatibility is where the final decision is made.

A 1971 Simca should be stored away from direct sunlight, standing water, and ozone-producing equipment such as electric motors, battery chargers, and welders. Keep the tires properly inflated, park on a clean surface, and move the car periodically if it will sit for long intervals. Bias-ply tires such as 560-13 tend to flat-spot more readily during static storage, while older-style sidewalls of any construction can suffer from environmental cracking if the car is left in harsh conditions.

Collectors who store a 1971 Simca for winter or between events often benefit from reducing prolonged load on one contact patch, either by rolling the car occasionally or using support methods appropriate to the suspension and chassis. Clean, dry, dark storage conditions do more for tire longevity than any dressing or cosmetic treatment. If the car is rarely driven, storage habits become part of the tire maintenance routine rather than an afterthought.

Tires on a 1971 Simca usually age out before they wear out, especially on a collector car that sees limited annual mileage. A good rule is to evaluate them closely once they reach the five- to seven-year range and to treat around ten years from the date code as a point where replacement deserves serious consideration, regardless of tread depth. Age, storage environment, inflation history, and time spent parked all matter more than odometer use alone.

That approach is especially important on a car like a 1971 Simca, where owners may drive short distances, attend shows, or keep the car indoors for long periods and assume the tires are still fresh because the tread looks good. Check the DOT date code if present and inspect the sidewalls and casing condition regularly. A tire that looks visually attractive can still be past its best service life.

Tires on a 1971 Simca should be inspected before every drive and more thoroughly before any longer outing. Look for sidewall cracking, cuts, bulges, uneven wear, and signs of impact damage, and verify that all four tires are holding the intended air pressure. If the car is running a setup that uses or may use tubes, valve-stem condition and slow air loss deserve extra attention.

A quick walkaround is often enough to catch problems before they become roadside issues, but a collector car benefits from a deeper inspection several times each season. Pay special attention after long storage, because flat-spotting, weather checking, and pressure loss may not be obvious until the car moves. Spare-tire condition matters too, since older spares are often the most neglected tire on the vehicle.

For a 1971 Simca 1204, bias-ply construction represents the earlier original-era tradition, while the presence of a 155R13 radial reflects the period when many European cars were moving into radial territory. Both 560-13 and 155R13 are associated with the 1204, but the exact factory-delivery choice can vary with market and specification. No single original-equipment brand should be assumed without period paperwork or marque-specific confirmation.

A careful restoration of a 1971 Simca 1204 should start by deciding whether the goal is strict factory-style authenticity, period road use, or a sympathetic driver restoration. If originality matters at a high level, compare the car’s surviving evidence, sales literature, and enthusiast-club references before settling on size, construction, and sidewall treatment. That extra step matters more on uncommon imports, where small market differences can change what is considered correct.

Correct tire fitment absolutely matters when showing a 1971 Simca, especially in events that judge authenticity rather than just overall presentation. Size, construction type, and sidewall style all affect whether the car looks era-appropriate. A modern-style radial on a car judged for strict originality, or a whitewall treatment that does not suit the car’s intended market presentation, can stand out even when the fit physically works.

For a 1971 Simca owner, the safest path is to match the tire choice to the standard of the event. Local cruise nights may be perfectly accepting of a radial conversion, while marque-oriented or preservation-minded judging often places more value on period-correct construction and appearance. Event rules and Simca club knowledge are more useful than broad assumptions when authenticity points are on the line.

On a 1971 Simca, both BFGoodrich and Firestone offer 560-13 bias-ply tires, but they differ in sidewall presentation and rim-width range. BFGoodrich versions appear in both 1.00-inch narrow whitewall and 2.25-inch wide whitewall forms and fit 3.50- to 4.00-inch rims. The Firestone 560-13 comes as a 2.25-inch wide whitewall and fits 4.00- to 4.50-inch rims, while load markings reach 850 pounds at 30 psi where shown.

That means the choice is not only about brand loyalty on a 1971 Simca. Wheel width may steer the decision, and the whitewall width certainly changes the car’s visual tone. If the car is being restored with a strong emphasis on period appearance, compare wheel measurements and decide whether the slimmer or fuller whitewall better matches the intended presentation before selecting between the two.

1971 Simca tires can be appropriate for highway driving when the tires are fresh, correctly inflated, and chosen within their intended construction and speed range. The 155R13 radial options carry H speed ratings, which correspond to a 130 mph ceiling. The 560-13 bias-ply products shown here do not present the same modern speed-letter detail, so their use should be approached with the more conservative mindset appropriate to vintage bias-ply construction and to the car’s own age and design.

In real-world collector use, a 1971 Simca is usually limited more by overall vehicle condition, braking, suspension, and age-related mechanical factors than by an H-rated radial’s top-speed ceiling. Bias-ply tires can still serve well on the road, but they reward moderate speeds and attentive setup. Highway confidence comes from matching the tire type to the car’s mission and keeping the whole vehicle sorted, not from looking at one specification in isolation.

Inflation pressure on a 1971 Simca should follow the vehicle manufacturer’s guidance for the car and the tire maker’s limits for the exact product. The 560-13 bias-ply products here carry load figures of 850 pounds at 30 psi where marked, while the 155R13 radial range includes at least one product with a 937-pound maximum load figure but without the same pressure figure presented alongside it. Pressure should never be copied from one size to another simply because both fit 13-inch rims.

The best practice is to start with the original vehicle recommendation for the appropriate size and then confirm that the chosen reproduction or radial tire is being used within its own rated limits. A 1971 Simca can respond noticeably to small pressure changes because it is a light car on narrow tires. Use a reliable gauge, check cold pressures, and make adjustments only after confirming which size and construction is actually on the car.

Before a longer drive in a 1971 Simca, inspect each tire for cracking, cuts, bulges, punctures, and uneven wear, and verify cold air pressure on all four corners plus the spare. Look closely at the valve stems and, if the setup uses tubes, be alert for slow leaks or signs of age at the stem base. Wheel-nut security, tread depth consistency, and any vibration noted on previous drives should also be part of the check.

A tire inspection is only one part of a proper road-trip routine for a 1971 Simca, but it is one of the fastest ways to prevent trouble. Older imported cars can spend long periods parked, and that storage cycle often reveals itself the moment the car goes back into sustained service. Pair the tire check with a broader review of brakes, fluids, belts, and lighting so the car is ready for distance rather than just a short local outing.