Rim width vs. tires rolling diameter

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   Given a rear tractor tire, how does the diameter change when mounted on narrower or wider rims? I have situation with a friend and a Ford 2N, it has a loader.

It has 10" rims with 11.2-28 tire. The rims are rotted, so are tires.
He went and purchased new rims, however, they are 11" wide.
This would normally mean he needs 12.4-28 tires. 
He did not get the tires yet. We wonder if he could use 11.2 tires on the 
11" rims. Unless people tell us that is OK, he will get the 12.4 tires.
So two issues, seem like the 11.2 is cheaper than the 12.4 and the
12.4 will speed up his tractor. 1st gear on that thing is already too fast,
going to 12.4 will make it even faster.
I think putting 11.2 tire on 11" rim will reduce the diameter compared to same tire on 10" rim. Do I have that right?  Would it be ok in looks and performance?
He will use beet juice or pink anti freeze as ballast.

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BrianC Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 16 Jun 2011 Location: New York Points: 1566	Post Options Post Reply Quote BrianC Report Post Thanks(0) Quote Reply Topic: Rim width vs. tires rolling diameter Posted: 29 Jan 2023 at 8:31am
	Given a rear tractor tire, how does the diameter change when mounted on narrower or wider rims? I have situation with a friend and a Ford 2N, it has a loader. It has 10" rims with 11.2-28 tire. The rims are rotted, so are tires. He went and purchased new rims, however, they are 11" wide. This would normally mean he needs 12.4-28 tires. He did not get the tires yet. We wonder if he could use 11.2 tires on the 11" rims. Unless people tell us that is OK, he will get the 12.4 tires. So two issues, seem like the 11.2 is cheaper than the 12.4 and the 12.4 will speed up his tractor. 1st gear on that thing is already too fast, going to 12.4 will make it even faster. I think putting 11.2 tire on 11" rim will reduce the diameter compared to same tire on 10" rim. Do I have that right? Would it be ok in looks and performance? He will use beet juice or pink anti freeze as ballast.

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DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 17479	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 29 Jan 2023 at 9:02am
	One inch of rim width difference won't be noticeable. Three or four inches difference will change the tire diameter for sure.

jaybmiller Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Greensville,Ont Points: 19464	Post Options Post Reply Quote jaybmiller Report Post Thanks(0) Quote Reply Posted: 29 Jan 2023 at 9:04am
	There's no 'magical formula' of tire width vs rims vs speed....... The problem is that tires are different from brand to brand ,even though they may all say 12.4x28 on them. Guy needed a 'boat trailer ' tire. I had one 5.80x ??, 4 bolt NOT the same !! even has same air pressure and rim !! arrrrrrrrrrrrrrrrrrrrrrrrrrrrgh..... might try Miller tire ? for a chart ? or say a Ford tractor website yeah, 2N is real fast in first gear....had one... and just HOW do you hit left brake and clutch at same time !!!
	3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water

200Tom1 Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 03 Jun 2019 Location: Iowa Points: 895	Post Options Post Reply Quote 200Tom1 Report Post Thanks(0) Quote Reply Posted: 30 Jan 2023 at 12:40am
	Brian, I owned a farm tire dealership for 22 years. Go ahead and get the 11.2's. Be sure he gets new tubes for them. The wider rims will cause the old tubes to stretch differently, might cause a seam to split on the old tube.

Bill_MN Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Location: Sioux Falls, SD Points: 1457	Post Options Post Reply Quote Bill_MN Report Post Thanks(0) Quote Reply Posted: 01 Feb 2023 at 6:52pm
	Wider rims will flatten out the tread and reduce the diameter, narrower rims will give the tread more crown and larger diameter. Wider rim and flatter tread will give better traction, as Dr. said an inch won't be noticeable.
	1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow