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285/40 R21 Bridgestone Turanza 6 variants
Bridgestone Turanza 6 is a summer tyre made in total of 115 sizes, ranging from R16 to R16 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 285/40 R21 is 90mm wider than the narrowest dimension (195) and 0mm narrower than the widest one (285). 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. In 285/40 R21, there is only one possible speed index for Bridgestone Turanza 6 - "Y", which is good for speeds up to 300 km/h.
Bridgestone Turanza 6 is made in 115 sizes, starting from 195/50 R16 up to 285/30 R22.