Bridgestone Alenza 001 285/40 R21

Bridgestone Alenza 001 is a summer tyre made in total of 96 sizes, ranging from R13 to R13 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 285/40 R21 is 70mm wider than the narrowest dimension (215) and -10mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (285mm), which results in 114mm sidewall height.