[allanv6gt]

Tyre 1 - 185/70x13
Tyre 2 - 215/50x15 (7" rim)

Compare Tyre 1 to Tyre 2
http://tire-size-conversion.com/tire-size-calculator/

Diameter = +1.3%
Width = +16.2%
Sidewall = -17.1%
Circumference = +1.2%
Revs/Mile = -1.1%

60mph becomes 60.8mph