The whole order comes off one line of raised lettering on the sidewall, and misreading it is how people end up waiting for a second visit. It runs something like 225/45 R17 94W. The first number is the width in millimetres. The second is not a measurement at all but a percentage, the sidewall height as a proportion of that width, which is why two tyres sharing a first number can look nothing like each other.
R is the construction and 17 is the wheel diameter in inches. Then comes the load index, 94 in that example, and the speed rating letter. Both are set by the car manufacturer and neither should be dropped to save money. A lower load index under a fully loaded car is a real risk rather than a technicality.
Look also for XL on the sidewall, which marks a reinforced casing, for run-flat markings, and for any short letter code near the rim tying the tyre to one manufacturer's own specification. Read all four wheels, because cars leave the factory with different sizes front and rear more often than people expect.
The High Street is not the sort of road you want to be jacking a car up on, and the parking around Widmore does not make it easier. We work right across Greater London, days, nights and weekends. A Masons Hill cul-de-sac or a Shortlands main road, tell us which. A tight terrace in Shortlands or a narrow bay on the High Street is usually workable. BR1 takes in Bickley and Widmore, and we work the lot.
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Most of the planned fitting round here happens on driveways off Widmore Road, in office car parks and in the residential turnings towards Shortlands, all of which suit a booked job better than a forecourt does. Read the sidewall out when you ring, or photograph it, and the right tyres turn up on the first visit rather than the second.
An order given over the phone as a fifty profile when the sidewall actually read fifty five. Two digits apart on paper, a noticeable difference in rolling circumference and speedometer reading in practice. Sidewalls get photographed now before anything is loaded.
A car whose rear tyres were both wider and lower in profile than the fronts, exactly as it left the factory. The owner had been quoted elsewhere for four of the front size. We read all four sidewalls and supplied two of each.
A family car wearing tyres two steps below the index printed on the door pillar plate. Right size, wrong rating, and nobody had mentioned it at the time. The owner was shown the plate and the correct specification went on.
There is usually a plate or sticker in the driver's door shut or on the fuel filler flap giving the sizes and the correct cold pressures. The handbook carries it too. Failing both, send a photograph of the sidewall through and we will read it.
Sometimes, within limits, and it deserves a conversation rather than a guess. Altering the overall diameter changes the speedometer and on some cars upsets the stability system. Changing width without changing profile can foul on full lock.
It is not really about top speed. The rating comes with a construction that copes with heat, so a lower rated tyre on a car specified for a higher one runs hotter under sustained load. It can also affect an insurance claim.
The week and the year the tyre was made, so 2319 means the twenty third week of 2019. Worth checking on anything sold as new that may have sat in a warehouse, because depth tells you nothing about how long the rubber has existed.
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