Tire Width and Height
It does make it a smig taller but its almost not noticable.
Its about .4-.7" taller and wont notice it on the speedo.
You can have a 295/45 be wider than a 305/30.
your original size is 245/45, which means your sidewall is 45% of 245mm
sidewall-- 4.3 in ~ 110.2 mm
radius----12.8 in ~ 326.2 mm
diameter--25.7 in ~ 652.3 mm
circ.-----80.7 in ~ 2049.3 mm
revs/mile-785.0
so with 255/45 your side wall is 45% of 255mm
sidewall---4.5 in ~ 114.8 mm
radius----13.0 in ~ 330.6 mm
diameter--26.0 in ~ 661.3 mm
circ.-----81.8 in ~ 2077.5 mm
revs/mile-778.0
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your original size is 245/45, which means your sidewall is 45% of 245mm
sidewall-- 4.3 in ~ 110.2 mm
radius----12.8 in ~ 326.2 mm
diameter--25.7 in ~ 652.3 mm
circ.-----80.7 in ~ 2049.3 mm
revs/mile-785.0
so with 255/45 your side wall is 45% of 255mm
sidewall---4.5 in ~ 114.8 mm
radius----13.0 in ~ 330.6 mm
diameter--26.0 in ~ 661.3 mm
circ.-----81.8 in ~ 2077.5 mm
revs/mile-778.0
yeah. most dont realize it cuz all they really care about is that first number... when in reallity both affect the way your care rides and drives... gas mileage and final gearing
I stumbled on this in my search, it seems to be close to other info I have seen.....
http://www.1010tires.com/TireSizeCal...bmit&reset=yes


