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[mycoupe]

So, I am looking to decrease the stretch on my rears (245/40/18 on 9.5" rim) and increase the stretch on the fronts (245/40/18 on 8.5" rim). So, would this setup have a similar looking stretch for the front and rear?

FRONT: 8.5" RIM

SIZE--------RIM WIDTH RANGE-----MEASURED RIM WIDTH------SECTION WIDTH
225/40/18----------7.5-9"-------------------8"---------------------9"

REAR: 9.5" RIM

SIZE--------RIM WIDTH RANGE-----MEASURED RIM WIDTH------SECTION WIDTH
255/35/18---------8.5-10"-------------------9"---------------------10"

Now, I am not looking to replicate the 245 setup, but rather create a new setup where the fronts have a stretch equal to the rear.

[Tee212]

Heres the stretch ratio formula I use. Take some consideration on tire brand as some run wide (broad shoulders) which is more ideal for stretching.

For a square (edge of rim flush with tire) rim tire fitment reference.
255/30/19 255x.3= 76.5 divide by rim width x9 = 8.5 ratio.

Any ratio lower 8.5 would induce stretch.
A ratio at 7-7.8 would produce a 45 degree angle stretch
Any ratio above 8.5 would bulge past the rim edge.

Another reference 235/35/19 x10.5 = 7.8 ratio. You can start plugging in your own tire specs to achieve the stretch or non stretch desired.

[Pcemkr]

www.willtheyfit.com
225 on 8.5" and 255 on 9.5" is not stretched

[mycoupe]

Originally Posted by Pcemkr

www.willtheyfit.com
225 on 8.5" and 255 on 9.5" is not stretched

According to the ratios above you, and what the 245 on the 9.5" rim currently looks like, they are. They may not be stretched quite like that pic, but I wouldn't roll with tires stretched like that if it would get me the best damn poon in the world!


































ok, maybe I would for the best damn poon in the world...BUT NOTHING SHORT OF THAT!!!