Staggered tire sizing help

[CMG]

I have multiple sets of wheels that I need to get tires for, trying to figure out stock diameter. I have one set of 16x7 and 16x8" wheels, and one set of 17x8 and 17x9 wheels. Please help me find correct tire size to keep stock diameter. And maybe different options for straight sidewall and pulled sidewall. Thanks.

[S13xCrazy]

look on the internet for tire size calculator....you punch in stock size, and then it will give you the modified size for whatever size rim you want....

[got chub]

look on the internet for tire size calculator....you punch in stock size, and then it will give you the modified size for whatever size rim you want....

i couldn't have said that better myself

[CMG]

look on the internet for tire size calculator....you punch in stock size, and then it will give you the modified size for whatever size rim you want....

OK, found one, Thanks.

[CMG]

Man, tried about 7 of them I found on google and still confused. They all compare general overall diameter, but say nothing about wheel size. If I pull back the sidewalls a little bit it will throw off the diameter. Anyone know one that calculates by wheel size and not tire size?

[Exar-Kun]

...whaaa? explain please. you mean by stretching them?

read the old faq I wrote..for every .5" rim width you gain an approximate .2" in section width..the OD change is incredibly miniscule...and it's what you're worried about from an ABS and speedo standpoint anyway

stock it's a pretty simple calculation..

205(mm)x.55 (aspect ratio) = 112.75mm section height /25.4 (conversion to inches) = 4.44" section height x 2 (you have two of em) = 8.8" + 16" (rim) = 24.877" or approximately 25" - you can vary this within about 3% and be just fine.

I did that quick so hopefully right

[ddgsxr504]

http://www.1010tires.com/TireSizeCalculator.asp

Look up stock wheel/tire sizes for your car and then play around with different sizes to get comparable overall diameters.

[MastaYu]

try this one too http://www.wheelsmaster.com/rt_specs.jsp

[CMG]

Thanks for the help. What I mean by stretched is that if I put a 205 on a 7" it will have a normal sidewall, while on an 8" it will pull the sidewalls back a bit and change overall diameter. The reason I asked about that is for clearance issues with the fenders.

[ddgsxr504]

A 205 on a 7" wide wheel will have a little stretch to it. I used to run 7's back in the day and I had 215/45/17 and it was a straight block looking tire.

[TerminalVelocity]

Thanks for the help. What I mean by stretched is that if I put a 205 on a 7" it will have a normal sidewall, while on an 8" it will pull the sidewalls back a bit and change overall diameter. The reason I asked about that is for clearance issues with the fenders.

What offset are these wheels that will cause you fender clearance issues.

To find the actual height of the streteched tire, you're gonna need to know some basic geometry than and solve the right triangle created by the stretched tire for the triangles height.

When you get this height, multiply it by 2 and add the wheel diameter. This will give you the overall diameter of the stretched tire.