Unigrip Lateral Force 4S 245/40 R21

Unigrip Lateral Force 4S is a tyre made in total of 100 sizes, ranging from R17 to R17 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 245/40 R21 is 30mm wider than the narrowest dimension (215) and 50mm narrower than the widest one (295). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (245mm), which results in 98mm sidewall height.