16.9-24 vs 16.9-28 for Kubota M6040
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Farmer495
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2wd...easy yes.
4wd...what is your front tire size? The op manual should have allowable combinations. You may or may not have to change your front tires to match.
4wd...what is your front tire size? The op manual should have allowable combinations. You may or may not have to change your front tires to match.
sandman2234
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Rims and tires could probably be found, but my question is "why"?
If you have a source for the smaller tire already mounted on a rim, then measure them and see if they will fit. If you need to drop size for another reason, it can probably be done, but won't be cheap. The cost of the rims to match your tires will probably surprise you.
David from jax
If you have a source for the smaller tire already mounted on a rim, then measure them and see if they will fit. If you need to drop size for another reason, it can probably be done, but won't be cheap. The cost of the rims to match your tires will probably surprise you.
David from jax
Brown Dog
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keep in mind those taller tires will change your gearing making your ground speed much faster.
Certain applications makes this a disaster.
Us poultry growers & vegetable farmers needs ground speed well under 1mph to do the job.
IF you have hills : it’ll kill your power a lot too.
The shorter the tire the BETTER for All of my applications
Certain applications makes this a disaster.
Us poultry growers & vegetable farmers needs ground speed well under 1mph to do the job.
IF you have hills : it’ll kill your power a lot too.
The shorter the tire the BETTER for All of my applications
OP
0070
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Front tires are 12.5/80-18 r4’s which I like the size and width but I am wanting to change the rear tires from 16.9-24 r4’s to a size 16.9-28 r4’s if possible
Roadworthy
Elite Member
Almost anything is possible, it's just time and money. You will be looking at rims as well as tires for the rear. If your tractor is 4WD you will need to replace front tires and rims as well to keep the circumference ratios the same. You will need to calculate this ratio with your existing setup.
rScotty
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That's right. When changing tire sizes on a 4wd you have to keep the ratio of the front to rear tire
"Rolling Weighted Circumference" the same as it is stock. That way you match the internal transmission F/R gear ratio. Otherwise you create what is called driveshaft windup and that can destroy the front driveshaft and more.
You can find Rolling Circumference - sometimes called Weighted Rolling Circumference - in the tire spec book from the manufacturer of your original tires. Rolling Circumference is not the same as simple circumference; RC cannot be calculated from diameter or radius. It depends on tire flex and has to be measured.
I've done tire swaps like that on several 4wd tractors. Doing it requires some homework and searching to get the ratio right, and usually you end up having to buy new wheels as well as tires.
rScotty
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0070
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Thank you all for your input, sounds like I have some work to do before final decision
, I am very excited for all the advice coming from people who know more or have experience in this area. Thank you
OP
0070
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Thank you
IH3444
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| Kubota M6040 Tires | |
| Standard tires (ag) | Front: 7.50-16. Rear: 16.9-28 (2WD) |
| Front: 9.5-24. Rear: 16.9-28 (4WD) | |
| Optional tires (ag) | Front: 6.50-16. Rear: 14.9-28 (2WD) |
| Front: 9.5L-15. Rear: 14.9-28 (2WD) | |
| Front: 9.5L-15. Rear: 16.9-28 (2WD) | |
| Front: 9.5-24. Rear: 14.9-28 (4WD) | |
| Lawn/turf front | 29x12.5-15 (2WD) |
| 27x9.5-15 (2WD) | |
| 305R343 | |
| Lawn/turf rear | 21.5L-16.1 (2WD) |
| 16.9-24 (2WD) | |
| 570-648 | |
| Industrial front | 12.5/80-18 (4WD) |
| Industrial rear | 16.9-24 (4WD) |
