Goodride SA37 265/40 R21

Goodride SA37 is a summer tyre made in total of 80 sizes, ranging from R15 to R15 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 265/40 R21 is 80mm wider than the narrowest dimension (185) and 20mm narrower than the widest one (285). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (265mm), which results in 106mm sidewall height.