Continental UltraContact is a summer tyre made in total of 80 sizes, ranging from R14 to R14 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 215/45 R17 is 60mm wider than the narrowest dimension (155) and -20mm narrower than the widest one (195). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (215mm), which results in 96.75mm sidewall height. In 215/45 R17, there are 2 possible speed indexes for Continental UltraContact - "V","Y", which are good for speeds up to 240, 300 km/h. In 215/45 R17, UltraContact usually competes against N blue HD Plus, which is a tyre from Nexen with a rating of 42%, compared to 0% of the Continental in question.