What is the front/rear gear ratio on an m7040?
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KenBike
Bronze Member
I think the front tires are geared stock to be a few percentage faster then the rear. If you drive on fresh groomed sand I noticed my front always are slipping when looking at the tire imprint.
I did change my fronts about 4 years ago and did not have any issues except it was hard for gage power steering to turn the tires in heavy dirt.
Just swapped my 7040 for a 2018 7060 with the metric radials.
The after market tires I purchased ended up the same size as the new tractor. You can order tires and rims from Kubota for $2000. I paid Miller tire in Oh about $1900 for custom rims and tires shipped to my home. Very nice rims but BKT tires. I would get a quote from your dealer.
I did change my fronts about 4 years ago and did not have any issues except it was hard for gage power steering to turn the tires in heavy dirt.
Just swapped my 7040 for a 2018 7060 with the metric radials.
The after market tires I purchased ended up the same size as the new tractor. You can order tires and rims from Kubota for $2000. I paid Miller tire in Oh about $1900 for custom rims and tires shipped to my home. Very nice rims but BKT tires. I would get a quote from your dealer.
KenBike
Bronze Member
Look in the tire area, just reopened my old thread on wider front tires, good luck.
sixdogs
Super Star Member
- Joined
- Dec 8, 2007
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- Kubota M7040, Kubota MX5100, Deere 790 TLB, Farmall Super C
Here's another way of using the "front axle gear ratio" to compute the acceptable range of rolling circumferences for the M7040/M7060. Using the supplied ratio of 1.4383 provided by lakeridge and using this site here
Mounting Tires on Four Wheel Drive Tractors
this is what I came up with. Using the OEM 16.9-30's with a rolling circumference of 173", the OEM 9.25-24 fronts and 123 rolling circumference provide around a 2% lead.
A 1% lead would equal a 121.48 front tire rolling circumference.
2% " 122.69
3% " 123.89
4% " 125.09
5% " 126.29
So, the 9.25-245 is perfect as is the 20" OEM metric option in Canada and Europe . The 11.2-24 tires some have used as a front tire option are too big with their rolling circumference of 127.9 exceed the desired range of 2 to 5% with it's more than 7% "lead". If guys are using 11.2-24's and haven't had troubles yet, it must be because they are in 2WD a lot or in very soft dirt that lessens the damage. Really, the only two choices for the M7040/M7060 are the OEM 9.25-24 and the metric 3.20-20's and bias 12.4-20's. The rolling circumference is very close to OEM in these.
Anyway, that's what we have so far. For me, I have Firestone 16.9-30 radials on the rear now and plan to order the radial equivalent of the 9.5-24's for the front and live with it. That is, unless someone finds a lower priced maker of 20" wheels for the front. Then I would use the Europe/Canada metric OEM 320-20's choice and be happy with it.
Mounting Tires on Four Wheel Drive Tractors
this is what I came up with. Using the OEM 16.9-30's with a rolling circumference of 173", the OEM 9.25-24 fronts and 123 rolling circumference provide around a 2% lead.
A 1% lead would equal a 121.48 front tire rolling circumference.
2% " 122.69
3% " 123.89
4% " 125.09
5% " 126.29
So, the 9.25-245 is perfect as is the 20" OEM metric option in Canada and Europe . The 11.2-24 tires some have used as a front tire option are too big with their rolling circumference of 127.9 exceed the desired range of 2 to 5% with it's more than 7% "lead". If guys are using 11.2-24's and haven't had troubles yet, it must be because they are in 2WD a lot or in very soft dirt that lessens the damage. Really, the only two choices for the M7040/M7060 are the OEM 9.25-24 and the metric 3.20-20's and bias 12.4-20's. The rolling circumference is very close to OEM in these.
Anyway, that's what we have so far. For me, I have Firestone 16.9-30 radials on the rear now and plan to order the radial equivalent of the 9.5-24's for the front and live with it. That is, unless someone finds a lower priced maker of 20" wheels for the front. Then I would use the Europe/Canada metric OEM 320-20's choice and be happy with it.
Dave M7040
Elite Member
- Joined
- Dec 10, 2012
- Messages
- 2,757
- Location
- Williamstown Ontario Canada
- Tractor
- Kubota M7040 Nuffield 465
My hard earned lesson with a new M7040 is to no longer trust the tires meet the standards shown on the sidewalls.
This will be important when trying to select a different size of tire as it is when buying tire chains.
I wanted R4 tires on my new tractor. Never gave it a second thought.
Tires put on by Kubota Canada for dealer were 16.9-28 TG-01 by MITAS.
About two years later, I order TRYGG studded tire chains for the rear wheels. The advertisement from TRYGG said no cutting or fitting necessary with this design.
When the chains came in and I started to install them they were too long. There was no way to get them to fit.
I complained right to TRYGG's head office in northern Europe. I received a reply within a day!.
They asked me to measure the height of my rear tires which was 52.625.
TRYGG provided the Tire and Rim Association specification for my size of tire which is 57.17".
Using the simple formula for circumference C=pi xDia my tire chains were 14-1/4" too long for the tires I was given with my new tractor.
Kubota ignored me. Ignored the destroyed right step ripped up by a loose tire chain.
TRYGG to the contrary were beyond belief in their response. "Bring your chains to our distributor in Canada and we will, at no charge, alter them to fit the tires you actually have."
I just finished installing the modified chains and they fit like a dream. I was traveling on paved and gravel roads today at 20+ kph with no problem.
I feel badly let down by Kubota. On the other hand TRYGG came to my rescue.
Dave M7040
This will be important when trying to select a different size of tire as it is when buying tire chains.
I wanted R4 tires on my new tractor. Never gave it a second thought.
Tires put on by Kubota Canada for dealer were 16.9-28 TG-01 by MITAS.
About two years later, I order TRYGG studded tire chains for the rear wheels. The advertisement from TRYGG said no cutting or fitting necessary with this design.
When the chains came in and I started to install them they were too long. There was no way to get them to fit.
I complained right to TRYGG's head office in northern Europe. I received a reply within a day!.
They asked me to measure the height of my rear tires which was 52.625.
TRYGG provided the Tire and Rim Association specification for my size of tire which is 57.17".
Using the simple formula for circumference C=pi xDia my tire chains were 14-1/4" too long for the tires I was given with my new tractor.
Kubota ignored me. Ignored the destroyed right step ripped up by a loose tire chain.
TRYGG to the contrary were beyond belief in their response. "Bring your chains to our distributor in Canada and we will, at no charge, alter them to fit the tires you actually have."
I just finished installing the modified chains and they fit like a dream. I was traveling on paved and gravel roads today at 20+ kph with no problem.
I feel badly let down by Kubota. On the other hand TRYGG came to my rescue.
Dave M7040