explain tire sizes to me???!!!

ok here is the deal, i own an 02 Blazer Xtreme and I am lookin to put some twenties on it. I have been lookin around and trying to decide what size tire to put with them???i have seen everything from a 245/35/20 255/35/20.so what i am asking is....explain to me what the 245/35 is. The first to set of numbers is what i understand. Later

245 is the width in mm and then the 35 is the percentage of the 245 that the sidewall is. so the sidewall for that tire would be 35% of 245.

245 = width (the higher, the wider)
35 = Series of tired, meaning height

I believe this is true, not a wheel expert but yeah I am pretty sure it's close

the first set is width in milimeters the second set is sidewall in precentage of the width ie: 30% 35% so 245mm being 9.64 inches and 35% is 3.37 inches so 245/35 is 9 1/2 by 3 1/2 inches

20 INCH
TIRES TIRE
HEIGHT
275 30 20 26.50
285 30 20 26.73

245 35 20 26.75
255 35 20 27.03
265 35 20 27.30
275 35 20 27.58

245 40 20 27.72
295 40 20 29.29
305 40 20 29.61

275 45 20 29.74
295 45 20 30.45
305 45 20 30.81

265 50 20 30.43
285 50 20 31.22
295 50 20 31.61
305 50 20 32.01
325 50 20 32.80

275 55 20 31.91

22 INCH
TIRES TIRE
HEIGHT
285 30 22 28.73
295 30 22 28.97

265 35 22 29.30

305 40 22 31.61
325 40 22 32.24

305 45 22 32.81

the first three sets of numbers are the tire size, the last numbers are the height of the tire which is most important to us with lowered trucks. Hope this helps with height anyway.

DRAG ON!

big joe is right, the first number is the tread width, the second number is a percentage of the first number.

www.1010tires.com this website is pretty good for working out what size tire youve got is equavilent to what you wanna run as well... go to the tech section