I have a 24 X 3 inch rim and a 25 X 2 1/2 inch rim. Both had 30 X 3 tires. Is this a correct application size for both?
I don't know how you measured, but a 30X3 tire has a 24" rim and a 30X3 1/2 has a 23" rim.
Rim size is measured from the point inside the rim to the opposite inside. Same point as you would measure for the "center" hole inside of the tire Unmounted.
I hope I put this in correct English
Contact the guys from the Indy 500 Chapter. There is several members in your area. Kenny Edmondson in Indy or Jack Daron in Brownsburg, In. among a few. Can't find their phone no., but someone can.
On face value, it does not seem correct.
The rim for a 30x3 tire is 24 inches across the centers. I do not have a 25x2 1/2 rim, but I would guess it would be 25 inches between centers so the 30x3 tire would have to be stretched by quite a bit to fit. It would be possible I suppose, but not a correct application.
in this post,
scroll down to Hap's post of 10/09/ and see if that helps...
I measured outside edge of rim for width and outside also for diameter. Thanks all for input.
You have to measure about 3/4" inside the lip of the rim on each side to get the rim diameter. Model T wheels originally came in 21", 23" and 24" diameters.
It sounds like you have a 23" and a 24" wheel. A 30 X 3 tire should be mounted on a 24" rim. The rim width is not typically considered when selecting tires for cars of this era.
The tire size is 3" thick on the top and bottom, so to find the proper rim size for a tire marked in this fashion you would add the tire height (3 inches) twice and then subtract from the tire diameter.
So in this case 3+3 = 6.
30 - 6 = 24.