JD wheele on a Mahindra

[Spentit]

I have a 2565 Mahindra with R1 tires. Looking for R4 tires so as to be a bit easier on my lawn. Found a set off of a JD 4044R 6 lug front, 8 lug rear. I understand the matched gear ratio on 4x4 's have to have certain ratio's but my question is are compact/utility tractor wheels created equal across brands. 6 lug fit an 6 LUG, 8 lug fit an 8 lug? I want to swap these JD R4 10-16.5 front, 16.9x24 rear. Onto my Mahindra 2565. If it had R4's they would be 10.6/80x18 front, 18.4x24 rear. I researched the diameters on all the tires and the JD's are a bit shorter. Does any one have experience doing this? The JD tires are a bit shorter but they came off the same tractor so I am hoping for an equal rolling ratio. If that ratio matches the mahindra is the $5000. question, or what ever it cost to replace the gears that might get cooked. But at this point I am curious about wheel swapping. Any help would be appreciated.

 

[Wagtail]

I don't reckon that there wouldn't be any problem as long as the lugs match up. Tractors, after all, go by hours accumulated as opposed to kms/miles travelled.

It shouldn't be a problem and you're not going to 'cook' anything as tractors don't travel fast enough to do that.

 

[Spentit]

I don't reckon that there wouldn't be any problem as long as the lugs match up. Tractors, after all, go by hours accumulated as opposed to kms/miles travelled.

It shouldn't be a problem and you're not going to 'cook' anything as tractors don't travel fast enough to do that.

Thank you sir, I needed a bit of encouragement on this swap.

 

[CincyFlyer]

I have a 2565 Mahindra with R1 tires. Looking for R4 tires so as to be a bit easier on my lawn. Found a set off of a JD 4044R 6 lug front, 8 lug rear. I understand the matched gear ratio on 4x4 's have to have certain ratio's but my question is are compact/utility tractor wheels created equal across brands. 6 lug fit an 6 LUG, 8 lug fit an 8 lug? I want to swap these JD R4 10-16.5 front, 16.9x24 rear. Onto my Mahindra 2565. If it had R4's they would be 10.6/80x18 front, 18.4x24 rear. I researched the diameters on all the tires and the JD's are a bit shorter. Does any one have experience doing this? The JD tires are a bit shorter but they came off the same tractor so I am hoping for an equal rolling ratio. If that ratio matches the mahindra is the $5000. question, or what ever it cost to replace the gears that might get cooked. But at this point I am curious about wheel swapping. Any help would be appreciated.

There are no standard bolt circles, so measure carefully. Note also that some wheels index off of the hub hole, so that will also need to be the same. Otherwise, you can either only use two-wheel-drive, or you can measure the rolling circumferences and see if the ratio is correct. There exists a standard for relative tire sizes, so that if you use an A and a C, you could also use a B and a D, but it's not yet in wide use.

 

[Spentit]

Thank you for the reply. The ratio calculation is my weak link. The tires are a matched set so the rolling ratio between them is a given I would think. But other variables come into affect. Like the front to rear ratio's on the donor tractor verses the front to rear ratio's on my tractor. Another comment posted earlier is that the slow speeds of a tractor would have little affect. And it would only be an issue when in 4wd. Maybe I am putting to much into this rolling ratio thing but it has to be addressed. Thanks again

 

[CincyFlyer]

Thank you for the reply. The ratio calculation is my weak link. The tires are a matched set so the rolling ratio between them is a given I would think. But other variables come into affect. Like the front to rear ratio's on the donor tractor verses the front to rear ratio's on my tractor. Another comment posted earlier is that the slow speeds of a tractor would have little affect. And it would only be an issue when in 4wd. Maybe I am putting to much into this rolling ratio thing but it has to be addressed. Thanks again

It will only matter in four wheel drive, but the speed doesn't matter: when on grass, you can drag or overrun the axle with least traction, causing turf damage. When on hard surfaces, the gears must absorb the difference in order to allow one axle to slip rather than binding. If it does not, such as on pavement, you can destroy expensive parts.
Easy enough to measure your own rolling tire circumference ratio, and possible to measure the replacement tires and get a handle on whether they are close.

 

[Spentit]

It will only matter in four wheel drive, but the speed doesn't matter: when on grass, you can drag or overrun the axle with least traction, causing turf damage. When on hard surfaces, the gears must absorb the difference in order to allow one axle to slip rather than binding. If it does not, such as on pavement, you can destroy expensive parts.
Easy enough to measure your own rolling tire circumference ratio, and possible to measure the replacement tires and get a handle on whether they are close.

Here are the numbers... Donor tires circumference : front 91", rear 153". Tires being replaced: front 109", rear 160". The question would be are the ratios's per revolution close. I can't do the math.....Anyone?

 

[Spentit]

Sometimes I surprise myself. Please correct me if I am wrong. I got that the donor tires have a 1.69 to 1 ratio. Where the existing tires have a 1.4 to 1 ratio. Are the ratio's close enough to work or will they put an undue strain on the drive train? In 4wd of coarse.

 

[Mendonsy]

I did the same calculation and came up with 1.69 and 1.46. Either way that seems like too much of a difference. It would be a lot like constantly try to turn on hard surfaces.

 

[Spentit]

I did the same calculation and came up with 1.69 and 1.46. Either way that seems like too much of a difference. It would be a lot like constantly try to turn on hard surfaces.

I sharpened my pencil and found that if I swap out the 10-16.5 front tires to a 12-16.5 tire with a 101" cir. I get to a 1.51 ratio. I think is an acceptable risk. Now if the wheels will fit. Thanks for y'all's help.