245/70 R17.5 Bridgestone R227 variants
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Bridgestone R227 is a tyre made in total of 9 sizes, ranging from R18 to R18 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 245/70 R17.5 is 40mm wider than the narrowest dimension (205) and 40mm narrower than the widest one (285). This tyre profile of 70 means the sidewall height of the tyre is 70% of the tyre width (245mm), which results in 171.5mm sidewall height. In 245/70 R17.5, there is only one possible speed index for Bridgestone R227 - "", which is good for speeds up to km/h.
245/70 R18 136
Bridgestone R227 is made in 9 sizes, starting from 205/75 R18 up to 285/70 R20.