yes in a nut shell at 70 mph your actually nearly doing 75 mph due to the rolling radius being more with the 17s.Youngster said:Hi
Is this why I'm losing acceleration when I've put my 17's on (185/55-14 to 205/40-17) ???
Only having a 1.5 and I need all the help I can get not take some away
When you've not got a lot of power to start with you tend to notice these things