Someone posted this mph/gear ratio calculator using the gear ratios from an 07 STi and 3.54 final drive. It shows that @ 9k rpm with a 25" tire the speed will be 166mph

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6th gear will not plot on the graph because its under a 1:1 ratio. So the 2nd from the top is 4th gear.

 

Wow, thats amazing how much a tire will change things

 

his tire was def taller then 25... isnt stock 25?

 

I think 22 is stock?

 

22" circumference- 69.08/rev
25"-78.5/rev

9.42/rev more then stock

 

What exactly does this mean, cause im not sure???

 

youll go a further distance with one revolution with the bigger tire since the circumference is greater