215/55 R17 tyres have a width of 215 mm - as shown by the first number in the description. Height can be determined by multiplying the width value with the second number in the description, which represents a percentual value - 55% of 215 mm = 118.25 mm (flank height). The inner diameter is 17 inches, as specified by the third number in the description. This last number is very important for choosing the proper rims for these tyres.
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