Dunlop Sp346 is a allround tyre made in total of 17 sizes, ranging from R17 to R17 - this particular dimension is R22, which means it fits to a 22 inch/558.8mm diameter wheel. 385/65 R22,5 is 180mm wider than the narrowest dimension (205) and 0mm narrower than the widest one (385). This tyre profile of 65 means the sidewall height of the tyre is 65% of the tyre width (385mm), which results in 250.25mm sidewall height. In 385/65 R22,5, there is only one possible speed index for Dunlop Sp346 - "K", which is good for speeds up to km/h.