Need help with tire and rim size..

jcw74801 · Nov 9, 2019

Tractor is an old Mitsubishi MT300D.

Tractor manual says rear AG tire size 12.4-24 on w10-24 rim. So I purchased 12.4 tires.

Well, turns out the tractor has 11.2-24 tires on w9-24 rim (24xw9 stamped on rim).

Any chance the 12.4 will fit on the 9-24 rims?

I wish I could stop doing things the hard way, sigh.

topbuilder · Nov 9, 2019

I would think it will work. I run 13.6-24 on a tractor that came with 12.4-24s. I have had no issues in 20 years. You will have a tighter clearance at the lift arms but, if you have adjusted your tires to match your cutter, that will not be an issue either.

RickB · Nov 9, 2019

I would not want to put just one on, but a pair will be OK.

Roadworthy · Nov 9, 2019

I'm pretty sure a pair of them will work just fine. If in doubt consult the vendor or trade them for the appropriate size.

jcw74801 · Nov 9, 2019

OK, thanks for the comments. Looks like there is plenty of clearance for the tires and 12.4 is a standard size for the tractor. My wheels are set for the widest wheelbase.

I was mostly worried about the rim being a 9x24 instead of 10x24.
The manual shows the 9x24 rim for a 11.2-24 "ES" tire. Maybe ES is a turf tire.

Anyways, didn't want to spend a day wrestling tires only to find there is no way it would fit. I'll give 'em a try.

RickB · Nov 9, 2019

It is generally accepted that it is OK to go up one size in tire width for a given rim. Over the years I replaced 18.4x38s with 20.8s. 15.5x38s with 16.9s and 12.4x28s with 13.6s. No ill effects, of course these were all 2wd tractors.

If yours is 4WD I would not upsize the rears only.

topbuilder · Nov 9, 2019

Good Point! There is an OD difference.

RickB · Nov 9, 2019

topbuilder said:
Good Point! There is an OD difference.

I should have thought of that right off the bat.

jcw74801 · Nov 11, 2019

It is 4WD and I hadn't considered tire OD either.
However, the tractor now has factory spec lug tires, 7-16 front and 12.4-24 rear.
Just about kicked my butt, I don't have a good tire bar. I do have a cheap copy of a Bead Buster which really helped.
Thanks for the help guys... :drink: