Westlake Sport SA-37 is a summer tyre made in total of 64 sizes, ranging from R16 to R16 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 315/40 R21 is 120mm wider than the narrowest dimension (195) and -30mm narrower than the widest one (285). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (315mm), which results in 126mm sidewall height. In
315/40 R21, Sport SA-37 usually competes against
SA37, which is a tyre from
Goodride with a rating of 0%, compared to 0% of the
Westlake in question.
