Mickey ET Streets

Hi everyone, I have a question for you racers about rim widths and sidewalls.
Anyway, does the sidewall width get smaller if You run wider rims?
Right now I have ET Streets 30x 13.5-15 on a 10 inch rim, on a 1969 Dodge dart, with the leaf springs moved into the frame rails, and aftermarket wheel tubs installed.
Everything clears fine when sitting still.
There is about 1/2 and inch to 3/4 of an inch clearance both sides of the tire.
If I go to a wider wheel will the sidewalls be LESS bulged out?
I am asking because I really don't have the cash, to buy wider wheels and find out, it makes no difference. Plus right now, I cant drive the car, without getting a little rubbing of the tire on the inner wheel tub, on the left side. Which scares me to think what could happen!
Thanks in advance everyone.

Robert, If you go to a wider rim lets say a 12" from a 10" you can figure approx. .8" increase in section width. This means Your M/T ET street will go from a 13.6" section width to 14.4" approx. I have always been told to figure .2" for every 1/2" increase in rim width given this type of situation. I hope this helps.

How much air pressure do you run in them? My ET Streets will rub a bit when I'm aired down to about 15 or so but if I'm up at say 25-28 it will hardly ever rub.

Don.

I ran that same tire on a 12" rim and it rubbed slightly on the inner part of my tubs and was close to the leafs w/the springs moved into the frame. Now I run the hoosier qtp`s at 29x13.5 and they clear beautifully and HOOK like a mutha.

Thanks everyone,
Based on the info about wheel width and the increase in sidewall width, I guess I won't be getting any wider wheels!
I have tried air pressures from about 15 and on up to 25 p.s.i.
Its fine when just going straight! As soon as I take a right hand turn though...I can hear the squeak start.

I may as well, look into some other tire.
AND probably some suspension/chassis improvements

I`m telling ya the qtp`s that I run straight out work at least for me and come in at 91"`s circum. compared to 94"`s w/the et-street and clears nicely everywhere.