I bought a small tire to put on a 9 inch rim

I can tell you for sure, you can go much wider than 225 without rubbing. I was running 275/40-17 all the way around mine and I never had a rubbing issue. What is making you want to go to a narrower rim? I think you should just get a different set of tires for you current wheels. Also, as far as blowing the tire off the rim, I guess you are more at risk doing that now because the tires are stretched out to seat the bead. I think you will be ok if you don't drive like an idiot and understand your hazard areas (curbs, potholes, ect.).

 

They don't look like this, do they? Lol


What wheels do you have? They're probably the incorrect backspacing.

 

I would look out for hard corners also, just because you don't want to stress that stretched sidewall too much. As far as your rub marks from 255's, that seems to be a backspacing issue. I have 17x9 saleens with 275's all the way around and I wouldn't rub lock to lock. I was lowered about 2".

 

^hahaha that's kind of what im picturing lol. A 225 tire is way to small for a 9" rim.

 

What wheels do you have? How low is your car? Have any pics of anything? I have 275's up front and 285's out back. It rubs on the front during hard right turns. The back is fine.

This is backspacing

 

Do you have a pic of your setup?

I have a 94 GT and ran 17x9 OEM 03 Cobra wheels with 275 tires, no rubbing, even 1.25" spacers in the rear.

 

Wheel Offset and Backspace Explained

Wheel Offset and backspace are essentially two different ways of looking at the same thing. They determine the location of the wheel and tire assembly when bolted to the vehicles hub (how far in – tucked, or how far out they will sit).
Wheel Offset is the measured distance between the hub mounting surface and the wheels center line.
With X being the determined offset, the hub mounting surface on positive offset wheels is X amount forward from the wheel center line. The hub mounting surface on negative offset wheels is X amount backwards from the wheel center line. The hub mounting surface on 0 offset wheels is the wheel center line.
Wheel Backspacing is the measurement from the hub mounting surface to the back edge of the wheel.

Typically speaking, the higher the offset/backspace, the more the wheel will tuck inward towards the suspension or away from the fender. The lower the offset/backspace, the more the wheel will push out away from the suspension or towards the fender.
For Example:

• If the offset on a 9″ wide wheel is +12 mm, the hub mounting surface will be 12 mm forward from the wheels center line. Measuring from the hub mounting surface to the back edge of the wheel, the backspacing is 5.5″.

• If the offset on a 9″ wide wheel is -12 mm, the hub mounting surface will be 12 mm towards the back of the wheel from the wheels center line. Measuring from the hub mounting surface to the back edge of the wheel, the backspacing is 4.5″.

Here’s how to calculate the backspacing using the rim width and offset:
First – add 1″ to the rim width and then divide by 2 to find the wheels center line (you have to account for the wheel flange which is why you add 1″ to the rim width). Second – convert the offset which is in millimeters into inches (there is 25.4 mm in 1 inch so divide the offset by 25.4). Lastly – add the converted offset to the wheels center line (if the offset is positive) for the correct backspacing or subtract the converted offset to the wheels center line (if the offset is negative) for the correct backspacing.
For Example:
17×9 +12 mm offset

• 9″ rim width + 1″ = 10″

• 10″/2 = 5″ (wheels center line)

• +12 mm offset/25.4 = 0.47″ (0.50″ rounded up)

• 0.50″ + 5″ = 5.50″ Backspace

17×9 -12 mm offset

• 9″ rim width + 1″ = 10″

• 10″/2 = 5″ (wheels center line)

• -12 mm offset/25.4 = 0.47″ (0.50″ rounded up)

• 0.50″ – 5″ = 4.50″ Backspace

*Please note that the wheels center line is the backspacing for 0 offset wheels*

 

plagiarism at its best lol

 

No fair, you beat me to it

 

With that write up, I guarantee you started into it before me, if its any consolation....lol

 

Oh no not at all, I google searched "backspacing explained" and that was the first website that came up. I copy and pasted it, I cannot take credit for that and still consider myself an honest man.

 

sorry pics don't work. Did you click the image button and paste the link in there?

On fb, right click on the photo, then click copy image location. Dump that link into the coding. It will work.

 

I don't have facebook.......

 

Doesn't work even if you do. It's a private account.