Falken Sincera SN-832 Ecorun is a summer tyre made in total of 30 sizes, ranging from R13 to R13 - this particular dimension is R12, which means it fits to a 12 inch/304.8mm diameter wheel. 155/80 R12 is 20mm wider than the narrowest dimension (135) and 40mm narrower than the widest one (195). This tyre profile of 80 means the sidewall height of the tyre is 80% of the tyre width (155mm), which results in 124mm sidewall height. In 155/80 R12, there is only one possible speed index for Falken Sincera SN-832 Ecorun - "T", which is good for speeds up to 190 km/h.