- #1
sachin_himcs
- 3
- 0
sir
I want to know the reason.
why tractor backwheel larger then forewheel ?
thanks
I want to know the reason.
why tractor backwheel larger then forewheel ?
thanks
Why is the Tractor Backwheel Larger than the Forewheel?
- Thread starter sachin_himcs
- Start date
In summary, a tractor with larger back wheels is better at towing and maneuvering in difficult terrain.
- #2
FredGarvin
Science Advisor
- 5,093
- 10
Two reasons I can think of:
1. The larger tires are better in mud and soft ground. Smaller tires would have a greater tendency to dig into soft earth.
2. A more efficient means of transferring torque to the ground especially at slow speeds which is where tractors usually operate.
And just thinking out loud here, I'm not quite sure on this...
If a tractor has to tow something, the rear wheels will take the brunt of the load. The front tires will be for steering only.
1. The larger tires are better in mud and soft ground. Smaller tires would have a greater tendency to dig into soft earth.
2. A more efficient means of transferring torque to the ground especially at slow speeds which is where tractors usually operate.
And just thinking out loud here, I'm not quite sure on this...
If a tractor has to tow something, the rear wheels will take the brunt of the load. The front tires will be for steering only.
- #3
Danger
Gold Member
- 9,799
- 253
Hi guys. Fred's got it pretty much covered.
A lot of large new tractors are 4, 6 or 8-wheel drive (4 driving axles with 1 or 2 wheels each). On that type, they're all the same size.
The smaller 2WD ones are still all-terrain devices, and therefore need both the 'floatation' effect and the massive lugs. The large area of weight distribution aids in staying on top of mud and soft soil, so as to avoid either getting stuck or causing too much disruption of the ground. While spreading fertilizer, for instance, you don't want to be digging up the crop as you go. As mentioned, most of the weight of a tractor is on the back, so the thin wheels up front don't cause a lot of damage.
I don't know if anyone still makes them, but some of the older jobbies from when I was a kid were almost tricycles. The two front wheels were only a foot or so apart and had massive camber so they formed a downward-facing 'V'.
A lot of large new tractors are 4, 6 or 8-wheel drive (4 driving axles with 1 or 2 wheels each). On that type, they're all the same size.
The smaller 2WD ones are still all-terrain devices, and therefore need both the 'floatation' effect and the massive lugs. The large area of weight distribution aids in staying on top of mud and soft soil, so as to avoid either getting stuck or causing too much disruption of the ground. While spreading fertilizer, for instance, you don't want to be digging up the crop as you go. As mentioned, most of the weight of a tractor is on the back, so the thin wheels up front don't cause a lot of damage.
I don't know if anyone still makes them, but some of the older jobbies from when I was a kid were almost tricycles. The two front wheels were only a foot or so apart and had massive camber so they formed a downward-facing 'V'.
- #4
sree
- 4
- 0
Danger said:
how about wheel loaders? thay carry the mud/loose Earth on the front bucket, where you have the smaller tires.
- #5
Danger
Gold Member
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Quite true, sree, but they're in a different class. Generally speaking, they're used in mining or construction rather than farm-like conditions. Also, most of them do in fact have the same size of tires all around and the engine and ballast weights are in the back to offset the load.
If you mean the type that are sometimes attached to farm tractors, they don't carry a really significant amount of weight, and are usually only fully loaded when on hard ground. The lifting ability is based upon the centre of mass of the tractor rather than the strength of the hydraulics. If you try to pick up too much, the C of M will be ahead of the front wheels and the tractor will 'nose over'.
If you mean the type that are sometimes attached to farm tractors, they don't carry a really significant amount of weight, and are usually only fully loaded when on hard ground. The lifting ability is based upon the centre of mass of the tractor rather than the strength of the hydraulics. If you try to pick up too much, the C of M will be ahead of the front wheels and the tractor will 'nose over'.
- #6
brewnog
Science Advisor
Gold Member
- 2,750
- 7
Tractors and backhoes also look much better with big back wheels. They'd look ridiculous with big wheels just at the front, and nobody would buy them...
Now there's some real design input!
Now there's some real design input!
- #7
Shawnzyoo
- 105
- 0
in reply to danger's comment about the "tricycle" tractors
no one makes them anymore since they would tip over really easily
i used one growing up , it is a Farmall M
the advtange of it though is that it can turn a really sharp radius when you brake only one tire at a time
no one makes them anymore since they would tip over really easily
i used one growing up , it is a Farmall M
the advtange of it though is that it can turn a really sharp radius when you brake only one tire at a time
- #8
Danger
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Hi Brewski. Now I know why Cat was so eager to snap you up from uni. :rofl:
Right, Shawn... Farmall. I'd forgotten that brand entirely; was thinking of the little grey Ford. And ours did flop over a couple of times. It also, if I recall, had a tendency to pull wheelies if the plow hit a rock. Not much weight in the front end of one of those things.
Right, Shawn... Farmall. I'd forgotten that brand entirely; was thinking of the little grey Ford. And ours did flop over a couple of times. It also, if I recall, had a tendency to pull wheelies if the plow hit a rock. Not much weight in the front end of one of those things.
- #9
kleinjahr
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Tricycle tractors? Better have a GOOD roll cage when crossing a slope.
- #10
Danger
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No roll cage, but luckily they were very easy to jump off of. 
Anyhow, little buggers like that were just used around the farmyard and barns. Any field work pulled the big Case and Oliver into service.
Anyhow, little buggers like that were just used around the farmyard and barns. Any field work pulled the big Case and Oliver into service.
- #11
FredGarvin
Science Advisor
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A trike tractor. It doesn't surprise me, but I have never heard of one. You learn something new every day.
- #12
Cliff_J
Science Advisor
- 789
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Pics of some old John Deere tractors, lots of tricycle style ones:
http://johnnypopper.com/jdletter.shtml
When you see the near tri-cycle tractors race, its even better. Its all about how slow you can go, last to cross the finish line wins! Not as common anymore, but will still happen at a rural fair near July 4th in the midwest.
They really do allow for an incredible turning circle with one rear brake locked. It makes backing up trailers incredibly easy around bends or obstacles. On our farms, we had many Farmalls (I think they later became part of Case-IH) with a "B", "H", W4 and W6. Like the original Jeep, these tractors were designed in an era of easy serviceability by near anyone and incredible durability as an integral part of the DNA.
The ROPS (Roll Over Protection Structure) is sometimes adopted to older tractors, its a big roll bar near the seat, but cost and pride and lack of seat belts mean they are generally only on tractors where they were required for manufacture.
http://johnnypopper.com/jdletter.shtml
When you see the near tri-cycle tractors race, its even better. Its all about how slow you can go, last to cross the finish line wins! Not as common anymore, but will still happen at a rural fair near July 4th in the midwest.
They really do allow for an incredible turning circle with one rear brake locked. It makes backing up trailers incredibly easy around bends or obstacles. On our farms, we had many Farmalls (I think they later became part of Case-IH) with a "B", "H", W4 and W6. Like the original Jeep, these tractors were designed in an era of easy serviceability by near anyone and incredible durability as an integral part of the DNA.
The ROPS (Roll Over Protection Structure) is sometimes adopted to older tractors, its a big roll bar near the seat, but cost and pride and lack of seat belts mean they are generally only on tractors where they were required for manufacture.
- #13
Danger
Gold Member
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- 253
Cool link, Cliff. That do bring up a rememberization or two.
1. Why is the tractor backwheel larger than the forewheel?
The tractor backwheel is larger than the forewheel because it needs to support more weight and provide better traction for pulling heavy loads. The weight distribution on tractors is usually uneven, with most of the weight being in the back, so a larger backwheel helps to balance the weight and prevent the tractor from tipping over.
2. Does the size of the backwheel affect the performance of the tractor?
Yes, the size of the backwheel does affect the performance of the tractor. A larger backwheel allows the tractor to cover more ground with each rotation, making it more efficient and effective for farming and other tasks. It also helps to reduce slippage and provide better stability on uneven terrain.
3. Are there any disadvantages to having a larger backwheel on a tractor?
One potential disadvantage of a larger backwheel is that it may be more difficult to maneuver in tight spaces. The size and weight of the backwheel can also put more strain on the transmission and other parts of the tractor, potentially leading to more maintenance and repairs.
4. Are all tractors designed with a larger backwheel?
No, not all tractors are designed with a larger backwheel. It depends on the specific purpose and design of the tractor. Some tractors may have equal-sized wheels or even larger front wheels for specific tasks or terrain. It is important to consider the intended use of the tractor when choosing the wheel sizes.
5. Can the size of the backwheel be adjusted on a tractor?
Yes, the size of the backwheel can be adjusted on some tractors. Some models may have adjustable axles, allowing for different wheel sizes to be used depending on the task at hand. However, this is not a common feature on most tractors, and it is important to consult the manufacturer's instructions before attempting to adjust the size of the backwheel.
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