LG tractor wheel sizes

[cmkh3]

I have noticed that some tractors (Staying within the LG tractor size) such as the ingersol 4000 series have larger diameter rear wheels (taller) and other tractors have much smaller diameter rear wheels. What is or are the reasons you would want wheels of such differing diameters on a LG tractor?

Chris

 

[bontai_Joe]

The theory is that the larger, more powerful garden tractors will be doing things besides cutting grass like plowing soil, tilling, moving large amounts of snow, hauling heavy carts of firewood, grading stone pathways, etc, where the larger tires offer ground clearance, better floatation on loose soil, and greater load carrying capacity. However, some lawn tractors are coming with bigger tires recently and it is more for looks than a specific purpose, driven I suppose by marketing.

 

[s1120]

Well the advantage to the big 16" wheels on the case's, and Ingersoll's is one, a LOT of ground clearance. Good for garden work. Also the taller tires ride smoother.

 

[LBrown59]

larger diameter rear wheels (taller) and other tractors have much smaller diameter rear wheels
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What I have noticed is a two large or small of a diameter tires on rear wheels yields less traction on a given size range of machine.

My uncle had a tractor with taller back tires than my Bolens.
That tractor with those higher tires was helpless as all they wanted to do was spin out on him. I could have moved that load of dirt much easier with the Bolens.
I have a MTD with smaller diameter back tires than the Bolins . It spins out on even a slight slope if the grass is damp with dew. That was never a problem with the Bolens.

 

[ducati996]

</font><font color="blue" class="small">( larger diameter rear wheels (taller) and other tractors have much smaller diameter rear wheels
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What I have noticed is a two large or small of a diameter tires on rear wheels yields less traction on a given size range of machine.

My uncle had a tractor with taller back tires than my Bolens.
That tractor with those higher tires was helpless as all they wanted to do was spin out on him. I could have moved that load of dirt much easier with the Bolens.
I have a MTD with smaller diameter back tires than the Bolins . It spins out on even a slight slope if the grass is damp with dew. That was never a problem with the Bolens.

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If everything was equal in this example (tractor weight, design, etc) and the only thing that would be different is the size of the rear tire ( lets say 23" vs 26") my vote for traction advantage would go to the larger tire. You change the aspect ratio (gearing) and the larger the tire the greater the low end pulling aspect drive ratio. You lose on the top end speed however...

I chuckle when I see 27hp motors with a light frame, large tires 24" to 26" be driven by a belt....that power will never make it to the ground....hype driven

Ducati

 

[LBrown59]

I chuckle when I see 27hp motors with a light frame, large tires 24" to 26" be driven by a belt....that power will never make it to the ground....
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Why won't it? Is it because of belt slippage?
What does hype driven mean?

 

[bontai_Joe]

Part of it is a 400-500 pound machine with 27 horses will spin the tires vs a 1000 pound machine with the same engine. Weight equals better traction. Part of it is some of the light duty machines use smaller cross section belts than other machines which means the belt surface in contact with the sheave is less than a heavier belted unit, providing less ability to transfer power. And part of it is that there is a calculatable loss in power in using belts vs. a driveshaft. ALL belts slip to a certain degree, based on the radius of the drive sheave involved and the cross section size of the belt. Belts transfer power totally by friction of the sides of the belt and the sides of the sheaves. I calculate belt drives for machines every day for up to 75 HP electric motors, using sheaves with up to 5 grooves for 5 belts of a size MUCH bigger than used on any lawn tractor. Belt drive is fine, it is used a lot in industry with no problems, but it has its little peculuarities that have to be taken into account.