Lowered with 17 inch rims

[KDK1988GT]

are those..

FWIW:

225/60/15 (stock size) is a 25.56" tire. you'll want to stay as close to that as possible to maximize performance. i recommend the following:

if you want to stay the same size on all four corners:

245/45/17 ---> 25.64"

OR, if you want big and small:

275/40/17 rear ---> 25.56" (stock height )

and finally, just FYI in case you need a smaller tire:

235/45/17 ---> 25.28"
245/40/17 ---> 24.68"
255/40/17 ---> 24.92"

and your 255/55/17 comes in at 27.89, more than 2" taller than stock. (FWIW that will KILL your braking distances)

-steve

Are these numbers the same for all makes of tires?

 

[sleeper89]

Are these numbers the same for all makes of tires?

yes. when reading the sidewall on a 245/45/17 tire you can figure out a lot of the dimensions. Here's how to read it:

245=tire width in millimeters
45=aspect ratio ---> in this case the sidewall height in mm is 45% of the width in mm
17=rim size in inches (duh )

now, you must also consider manufacturing tolerances etc which will make the calculated size different from the actual size, which is one reason they say not to mix and match tires on your car even if they are the same size.





-steve