I just got new tires and coasting with highway traffic now shows ALOT faster than with my previous tires. I am wondering which tire size was correct. I now have 192-60R15 tires, Before I had 20-60R15s. Before it said I would be going with traffic at about 76MPH, now i usually am going over 80... about 82 usually. I dont want to get a 12MPH over going to and from school so please let me know which tire produces the correct speed.
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