really low prof. tires..hurt my rims??

[99firebirdconv.]

any body out there with 17 inch rims and have a 245/35/17 series tire on their rims, or any 35 series tire?? If so, when going around corners really fast, does your rim actually touch the ground at all??

[Patrick Javert]

the sidewall height is determinant on the tire width. a 275-40 tire will have 11 cm. of sidewall, a 235-55 tire will have 12.925 cm. of sidewall, and a 275-35 tire will have 9.625 cm. of sidewall. to find out sidewall, take tire width, and multiply it by the sidewall #/100. so, your 275-35 sidewall formula will look like this: 275(mm.)x (35 mm./ 100 mm.)=96.25 mm.=9.625 cm. I suggest not hitting too many potholes or sppedbumps too fast, unless you want the rims bent. less sidewall=better lateral grip, better appearance, less ride quality, possible lowered stance of car(depending on rim size).

[99firebirdconv.]

that is one hell of a sidewall man, 11cm, that kinda tire wouldnt even fit in the wheel well, you mean the width of the tire would be 11 cm!!
DID you read my question? what you said has nothing really to do with my question. ;)

[SuprSpdDB7]

<blockquote>quote:</font><hr>Originally posted by 99firebirdconv.:
that is one hell of a sidewall man, 11cm, that kinda tire wouldnt even fit in the wheel well, you mean the width of the tire would be 11 cm!!
DID you read my question? what you said has nothing really to do with my question. ;) <hr></blockquote>

umm... CM (centimeters) are small... i think u are thinking of INCHES

[Original 4th Gen V6]

SIDEWALL = Space between the top of the wheel, to the tread...hence the name SIDE WALL. I think there are some confused people on this thread. its pretty funny that the self explanatory (sidewall) could get confused with tire width.

[Brian Dieckman]

<blockquote>quote:</font><hr>Originally posted by 99firebirdconv.:
that is one hell of a sidewall man, 11cm, that kinda tire wouldnt even fit in the wheel well, you mean the width of the tire would be 11 cm!!
DID you read my question? what you said has nothing really to do with my question. ;) <hr></blockquote>

11 cm = 4.3 inches

to find inches devide CM by 2.54

If your rims are touching the ground in corners, there's a huge safety issue. I would even venture to say that you would get tire/rim separation before that would happen.

At any rate, my buddy had a blazer with some rediculous PIMPIN' wheels... 20's or something. The tire looked like a rubberband with tread. Besides the bone-jarring ride, there weren't any rim grinding problems.

Hope it helped.

-Brian

[99firebirdconv.]

yeah i know what the sidewall is, i think it was Patrick that was kinda screwed up with the sidewall, cuz there is no way a 275/40 will have an 11cm sidewall.....see what im saying?? :D

[V6Bob]

Patrick is dead right on this one.
275/40 means this:

275mm wide = 27.5 cm wide (about 11 inches)

27.5 cm wide X 40% = 11 cm tire height = "sidewall" (about 4-1/4 inches)

And there is no way you'd get the rim on the ground if you had air in the tire.

[ May 14, 2002: Message edited by: V6Bob ]</p>

[99firebirdconv.]

Sorry Patrick and bob but i was just at Kal tire to pick up my car cuz i got new rims and tires, and i looked at a 275/40 on a rim, and from the top of the rim to the top of the tire.... guess what, it only has 2.6 inches of SIDEWALL. [img]tongue.gif[/img]

[Patrick Javert]

you're forgetting that the sidewall sticks out a bit cuz of the air pressure in the tires. it'l look like 2 in., but if you were to take the tire off and deflate it, it'll be 4 in.

[pgriffith]

Maybe the calculation of 4.6 inches of sidewall is calculated for both top and bottom. I dunno what im talking about, I thought I was on to something.

[DominusEtDeusNatus]

<blockquote>quote:</font><hr>Originally posted by V6Bob:
Patrick is dead right on this one.
275/40 means this:

275mm wide = 27.5 cm wide (about 11 inches)

27.5 cm wide X 40% = 11 cm tire height = "sidewall" (about 4-1/4 inches)

And there is no way you'd get the rim on the ground if you had air in the tire.

[ May 14, 2002: Message edited by: V6Bob ]<hr></blockquote>

That's right.

The shorter the sidewall the stiffer it is. It's just going to be uncomfortable if it's short.

[V6Bob]

From the Goodyear website:

Tire Size
Service Description
Sidewall
ApprovedRim Width
Meas. Rim Width
Section Width
O.D.
Tread Width
Max.Load
P275/40ZR18 94Y VSB 9.0- 11.0 9.5 10.9 26.6 10.3 1,477

So the outer diameter is 26.6 inches, the wheel is 18 inches. That leaves 8.6 inches for 2 sidewalls or 4.3 inches for each.

The wheel 99firebirdconv. measured must have one heck of a big lip covering up 1.7 inches of sidewall. Or he must not have measured to the top of the tire (maybe he measured just just to the rounded edge where the tread begins?).

Aha! Lightbulb! I'll bet that's it. We're arguing about whether the "sidewall" measurement goes to the top of the tire or just to where the edge of the tread begins. The first is how tire measurements are stated, the second has a certain "common sense" appeal.

Original 4th Gen V6 understood a long time ago but he confused me by saying "width", where "height" would have done the trick.

[ May 14, 2002: Message edited by: V6Bob ]

[ May 14, 2002: Message edited by: V6Bob ]</p>

[99firebirdconv.]

that 4.3 inches is without the rim on, there is a lip on the sidewall that kind of goes inside the rim, with that lip on the tire then it is 4.3 inches. :D