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. 275/45 R21 is 90mm wider than the narrowest dimension (185) and 10mm narrower than the widest one (285). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (275mm), which results in 123.75mm sidewall height. In
275/45 R21, SA37 usually competes against
ZV7, which is a tyre from
Avon with a rating of 31%, compared to 0% of the
Goodride in question.
