Stretch and sidewall height

[Tuck&Poke]

that's because the measurement is taken from inside the edge of the lip to the other inside, and that edge of the lip is roughly .5in on each side. Remember that the sidewall mounts within those boundaries. You guys are talking about stretch in the fractions of an inch.... i know as this gets more mainstream its gonna get less hardcore, but your still within the approved rim width, which is where i draw the line for considering a tire stretched. Not knocking on you, just saying.

[Mike S]

True, but an 8" wheel is a bit wider in actuality. Stretching a 205 on an 8" wheel seems to be dependent on bead width, tire sidewall (flat or rounded), and tread pattern. Both myself and a friend are running 205/45s on 8s and there is definitely some visual stretch. Not much, but it's there.

That's what I'm seeing with these tires. The contact patch of the tire is roughly 7.25". If you include the widest part of the sidewall, it's 7.75". Then if you measure the distance between the outer edges of the lip, it's nearly 9".

It sucks not having more tire options. I need more wide.

[CSBolger]

doesnt work like that. In order for what your saying to happen, the circumference of the tire would have to decrease, which is impossible.

plus, a 205 on an 8 is not stretched. 205mm is approximately 8 inches

True, but an 8" wheel is a bit wider in actuality. Stretching a 205 on an 8" wheel seems to be dependent on bead width, tire sidewall (flat or rounded), and tread pattern. Both myself and a friend are running 205/45s on 8s and there is definitely some visual stretch. Not much, but it's there.

[Anonymoose]

Your right though, it 'looks' as if it's decreased. But really it shifted

|""""""""""| to /""""""""\

Fucken 10 inch yo!

[Mike S]

doesnt work like that. In order for what your saying to happen, the circumference of the tire would have to decrease, which is impossible.

plus, a 205 on an 8 is not stretched. 205mm is approximately 8 inches

Cool, that's the answer I wanted. And the stretch will be slight if there's any at all. This is fine right now. When these tires wear out, I'll likely buy new lips to get another inch in width.

[Tuck&Poke]

doesnt work like that. In order for what your saying to happen, the circumference of the tire would have to decrease, which is impossible.

plus, a 205 on an 8 is not stretched. 205mm is approximately 8 inches

[Mike S]

Hey dude, look here it will show all

Tyrestretch.com

Damn I should get $$$$ for the amount of times I refer that site! Hope you get it sorted

Thanks, I've looked there quite a bit. The photo's helped a lot.

Overall diameter doesn't change with stretch. There's no rubber being added or removed so it remains the same even as the sidewall shape changes

Right, I understand that there's no difference in material, but since the inner diameter of the tire is staying 17", the sidewall stretches inward causing the outer diameter to decrease. Is that not how it works?

I drew this up as an example. It's exaggerated to show what I'm referring to.

[aar0n.]

Overall diameter doesn't change with stretch. There's no rubber being added or removed so it remains the same even as the sidewall shape changes

[Anonymoose]

Hey dude, look here it will show all

Tyrestretch.com

Damn I should get $$$$ for the amount of times I refer that site! Hope you get it sorted

[Mike S]

I ordered 4 tires (205/45/17) Falken 912's, which arrived this past week. I want the front and rear to have matching sidewall height. The rear wheels are 8" wide while the fronts are 7" wide. Since the fronts won't be stretched and the rears will have a slight stretch, should I go with a 40 sidewall in the front to keep the outer diameter the same?

My theory is, stretching the rear will make the sidewall decrease causing it to look smaller than the front.

What do you think? Any input would be great.