Tyres for classic cars: the answers

In inch sizes of this type, 5.60 indicates the section width in inches, the dash the bias construction and 15 the rim diameter in inches. The height/width ratio is not shown. In the past sizes were expressed in inches, today in millimetres, and there is not always a direct correspondence. To find a suitable size consult manufacturers with ranges for classic cars, which reproduce original sizes, and always check the car's documentation.

Sources: michelin.it, pirelli.com

It means the tyre is radial (R), 165 mm wide and for a 13 inch rim, but the height/width ratio is not given in the size. It should not be assumed that it matches a modern 165/80 R13: before replacing it, outer diameter and dimensions must be compared. To find out whether an equivalent size or a reproduction of the original exists, consult manufacturers with ranges for classic cars or an experienced tyre fitter.

Sources: pirelli.com

It depends on the size and the car's documentation. Some manufacturers have ranges dedicated to classic cars: Pirelli Collezione, for example, reproduces historically correct tyres starting from the original specifications, but with the safety standards of modern technology. A modern tyre in a different size can change behaviour and dimensions. Check that the size is permitted by the car's documentation and that load and speed indexes are suitable.

Sources: pirelli.com

Classic tyres reproduce historic sizes, constructions and patterns, often bias-ply or early-generation radials. Some manufacturers, such as Pirelli with the Collezione range, start from the original specifications and moulds but apply current safety standards. Modern tyres are designed for today's cars. The choice depends on use, the car's performance and respect for originality.

Sources: pirelli.com

You read the DOT code on the sidewall: the last four digits indicate week and year (for example 1219 = the twelfth week of 2019). Tyres produced before 2000 have three digits; in the nineties a triangle was added to distinguish them from previous decades. On a car that is little used, age matters a great deal: in general Michelin recommends precautionary replacement 10 years after production, even with good tread.

Sources: continental-tyres.co.uk, michelin.it

It depends on the rim and the tyre. The word Tubeless on the sidewall indicates that the tyre does not require an inner tube; Tube Type tyres instead require one. A rim that is not airtight, like most spoked rims, which are drilled for the spokes, requires the tube. For many classic sizes dedicated inner tubes exist. Ask the tyre fitter to check the rim and compatibility before fitting.

Sources: michelin.it, michelin.it

Store the car indoors, in a clean, dry, temperate and ventilated place, away from direct sunlight, weather and solvents or hydrocarbons. Keep the pressure recommended by the manufacturer and check the sidewalls periodically: if cracks or deformations appear, have the tyres assessed before driving again. Remember that age matters more than mileage: check the DOT date.

Sources: michelin.it, michelin.it

You compare outer diameter and width: the new size must have a similar circumference, so as not to alter the odometer and behaviour, and fit within the wheel arch. Manufacturers' conversion tables exist, but Michelin warns that they do not count as a legal equivalence. Always refer to the car's documentation and ask the tyre fitter or a classic tyre manufacturer.

Sources: michelin.it, pirelli.com

Only if the rim, wheel arch and suspension allow it and if the size is provided for in the car's documentation. A wider tyre can touch the bodywork, make the steering heavier and change behaviour. Before deciding, check the sizes permitted for your model and ask a tyre fitter experienced in classic cars.