Tyre Cost per Mile 275/55R20: Dimensions, Cost per Mile, and What Changes the Answer

Tyre cost per mile 275/55r20 is a question about value, not about price alone, and the only way to answer it honestly is to divide the price by the miles the tyre is expected to last. A cheap tyre that wears out quickly can cost more per mile than a dearer tyre that lasts, and a dearer tyre that lasts no longer costs more per mile than the cheap one. This page gives you the method, a worked example with every assumption stated, and a table you can use to look up the cost per mile at three prices and three mileages. All prices and mileages in the examples are labelled as examples, because real prices change and real mileage depends on the car, the roads and the driver.

Tyre size 275/55R20 has an overall diameter of 810.5 mm (31.9 inches), a sidewall height of 151.2 mm, a circumference of 2546.3 mm and about 632.0 revolutions per mile. These are nominal new-tyre dimensions, and real tyres vary slightly by brand, model, wear and inflation pressure. The size itself does not decide the cost per mile — the price of the tyre and the mileage it delivers do — but the size decides which tyres you can choose between, and the price range for that size is the starting point of the calculation.

The cost-per-mile formula — tyre cost per mile 275/55r20

For tyre cost per mile 275/55r20, the point is this: The formula is cost per mile equals tyre price divided by expected mileage. For a set of four, divide the price of all four by the total miles, which gives the same answer as working out one tyre and multiplying by four. The formula looks trivial, and it is, but the discipline is in the inputs: the price must be the price you actually pay, and the mileage must be an estimate you are willing to defend, stated openly rather than hidden. A cost per mile quoted without its price and mileage is a number without a meaning, and it should not be used to compare tyres.

The size in numbers — tyre cost per mile 275/55r20

The cost per mile for this size follows the same formula as for any tyre: divide the price by the expected mileage. Because prices vary by brand, retailer and season, the worked example on this page uses example prices only, labelled as examples, and the table shows three prices at three mileages so you can look up the figure that matches the price you are actually quoted. Never treat an example price as a current price, and never treat an assumed mileage as a fact about the tyre. That is the point this page works through for tyre cost per mile 275/55r20.

Measurement Value
Overall diameter 810.5 mm (31.9 in)
Sidewall height 151.2 mm
Circumference 2546.3 mm
Revolutions per mile 632.0
Rim diameter 20 in

Worked example — tyre cost per mile 275/55r20

Take a tyre that costs £160 as an example price, with an assumed mileage of 30,000 miles. The cost per mile is £160 divided by 30,000 miles, which is £0.0053 per mile, or 0.53p per mile. A set of four at the same example price costs £640, and over the same 30,000 miles the set costs 2.13p per mile for all four tyres together. Over 12,000 miles a year, one tyre at this cost per mile would cost £64.00 in tyre wear for the year, and a set of four would cost £256.00. Change the price or the mileage and the answer moves with it, which is exactly what the table below shows. That is the point this page works through for tyre cost per mile 275/55r20.

Tyre price (example) 20,000 miles 30,000 miles 40,000 miles
£130 0.65p 0.43p 0.33p
£160 0.80p 0.53p 0.40p
£180 0.90p 0.60p 0.45p

Taking tyre cost per mile 275/55r20 as the case in point: The table uses example prices only. Read across a row to see how the cost per mile falls as the assumed mileage rises, and read down a column to see how it rises with the price. The comparison is only valid within a column, because each column holds the mileage constant.

What changes the cost per mile — tyre cost per mile 275/55r20

Taking tyre cost per mile 275/55r20 as the case in point: What changes the answer most for this size is the mileage, and the mileage depends on the car, the roads and the driver rather than on the size code. A car that is driven gently on smooth roads with correct pressures will get more miles from a set than the same car driven hard on rough roads with soft tyres, and the difference can be large enough to change which tyre is cheapest per mile. Check the door-jamb placard before fitting a different size, and confirm the load index and speed rating with a tyre professional.

  • Purchase price: the starting point of the calculation, and the only part that is fixed at the till. That is the point this page works through for tyre cost per mile 275/55r20.
  • Expected mileage: the divisor, and the part that varies most — it depends on driving, pressure, alignment, load and road surface. That is the point this page works through for tyre cost per mile 275/55r20.
  • On this page, tyre cost per mile 275/55r20 is the case in point: Driving style: hard acceleration and braking wear tread faster and push the cost per mile up.
  • Tyre pressure: under-inflated tyres wear their shoulders and can lose thousands of miles of life. That is the point this page works through for tyre cost per mile 275/55r20.
  • On this page, tyre cost per mile 275/55r20 is the case in point: Alignment: a car that scrubs its tyres on one edge wastes tread that should have been miles.
  • Taking tyre cost per mile 275/55r20 as the case in point: Load: a heavily loaded car, or one that tows, wears its tyres faster than the same car running light.

Common mistakes — tyre cost per mile 275/55r20

  • Taking tyre cost per mile 275/55r20 as the case in point: Comparing two tyres using different assumed mileages, so the cheaper result is an artefact of the assumptions rather than the tyres.
  • Taking tyre cost per mile 275/55r20 as the case in point: Quoting a tyre's mileage as a fact, when it is an estimate that depends on the car, the roads and the driver.
  • Forgetting that a set of four costs four times one tyre, and dividing the single-tyre price by the mileage of the set. That is the point this page works through for tyre cost per mile 275/55r20.
  • On this page, tyre cost per mile 275/55r20 is the case in point: Leaving fitting and balancing out of one tyre's figure and including them in another's, so the comparison is not like-for-like.

How to compare two tyres on cost per mile — tyre cost per mile 275/55r20

On this page, tyre cost per mile 275/55r20 is the case in point: Work out each tyre's cost per mile with the same assumed mileage, using the price you were actually quoted for each one. Then test the sensitivity: what happens if the dearer tyre lasts 25 percent longer, and what happens if it lasts no longer at all? If the dearer tyre only wins when you assume a much longer life, ask whether that longer life is plausible for your car and your driving. Check the label ratings for wet grip, fuel efficiency and noise at the same time, because the cheapest tyre per mile is not automatically the best tyre for the car. Finally, remember that fitting, balancing and disposal are real costs too — include them in both tyres' figures or in neither, but never in only one.

Related calculations — tyre cost per mile 275/55r20

Frequently asked questions

How do I work out the cost per mile of a tyre?

On this page, tyre cost per mile 275/55r20 is the case in point: Divide the price of the tyre by the number of miles you expect it to last. For example, a tyre that costs £120 as an example price and lasts 30,000 miles as an assumed mileage costs 0.40p per mile. For a set of four, divide the price of all four by the total miles, or work out one tyre and multiply by four. Always state the price and the mileage you assumed, because the answer changes with both.

What mileage should I assume for a tyre?

On this page, tyre cost per mile 275/55r20 is the case in point: There is no fixed figure, because mileage depends on the tyre, the car, the roads, the pressures and how the car is driven. Use a range rather than a single number — the table on this page shows three mileages — and pick the one that matches your driving. A tyre's real-world mileage is never a fact you can quote; it is an estimate that the method tests.

Is a more expensive tyre cheaper per mile?

It can be, if it lasts long enough to make up the higher price. Divide each tyre's price by the same assumed mileage and compare the results directly. A dearer tyre that lasts half as long again can cost less per mile than a cheap tyre that wears out early, while a dearer tyre that lasts no longer costs more per mile. That is the point this page works through for tyre cost per mile 275/55r20.

Does the cost per mile include fitting?

For tyre cost per mile 275/55r20, the point is this: The simple formula uses the tyre price alone, so fitting, balancing and any valves or disposal charges are not in it. If you want a fuller figure, add the fitting cost to the tyre price before dividing by the mileage, and say that you have done so. Comparing a fitted price with an unfitted price will give a misleading answer.

For tyre cost per mile 275/55r20, why do two identical tyres cost different amounts per mile?

For tyre cost per mile 275/55r20, the point is this: Because the mileage is different. Pressure, alignment, load, road surface and driving style all change how long a tyre lasts, and the same tyre on two cars can wear at very different rates. That is why the cost per mile is a method with stated assumptions, not a property of the tyre itself.