Continental Conti Hybrid Ht3 is a allround tyre made in total of 14 sizes, ranging from R13 to R13 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 445/45 R19 is 60mm wider than the narrowest dimension (385) and -60mm narrower than the widest one (385). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (445mm), which results in 200.25mm sidewall height. In 445/45 R19, there is only one possible speed index for Continental Conti Hybrid Ht3 - "J", which is good for speeds up to km/h.