Why tractor rear wheels are bigger

Therefore, preventing the tires from sinking down and getting stuck in soil, wet mud or loose terrain. Overall, increasing our efficiency and productivity in the field. This design feature is similar to a racing car, which also have larger rear wheel tires. Because they too want to maximize their traction with the ground.

Typically, utility farm tractors are two-wheel or rear wheel drive, which are perfect for farming and industrial purposes. Farm tractors are designed to go slow, so their rear wheel drive design takes advantage of weight transfer during forward movement, which maximizes traction while using lower RPMs and producing providing higher torque.

The engine converts the heavy revolution force into pulling power. The general law of physics suggests that the larger the diameter of a circle, or the higher the circumference, the larger amount of torque the object will produce. Whereas, race cars are designed to go fast, so their rear wheel drive design takes advantage of weight transfer during acceleration which increases the tire grip to the pavement while using higher RPMs and producing less torque.

The driving axle on our utility tractor is also situated higher above the ground because of the larger size of the rear wheels. This design feature also allows our tractor to pull more weight without our tractor either tipping over or having the front of it rise up. The driving axle functions similar to a lever — where twice the height provides twice the maximum pulling power. This higher elevation provides better visibility while driving. This helps us prepare and effectively protect our soil.

You can reduce tire pressure to as low a pressure as possible. This lower pressure, along with the wider tires will further reduce the compaction of the soil. The larger rear wheels have deeper treads.

These treads help us drive over very rough and uneven terrain without getting stuck. That is why the tractor rear wheel is big. The driving axle settled higher above the ground indicates the tractor can pull more weight without the front wheel rising. It works like a lever where the twice height means twice pulling force. The engine of a tractor is very heavy and powerful, located at the front of a tractor. So, the large wheels at the rear distribute the weight more evenly to counter a heavy front.

Mainly tractors are used to prepare the field before sowing seeds, and they also maintain healthy plants. A farmer needs to care for the soil as well as crops. The bigger rear tyres have a much larger surface area, the weight of the tractor is distributed across a large area, so the tyres do not compress the soil quality as much, which is why the rear wheels of the tractor are bigger. In the tyres market, many different tyre companies are available.

In the below section, we are showing the top 10 tractor tyre companies in India. The following are the popular tractor tyre companies in India. These are all about tractor rear tyres. We hope you liked this blog. For more updates, stay tuned with TractorJunction. Views: 4, The larger the rear wheels, the further the wheel will have to sink into the ground to become stuck, which, on the common automobile, is a little over halfway between the center of the rim wheel , and the contact point to the ground.

This is the point where tires have to climb their way out increasingly more vertically, instead of pulling themselves out more horizontally. Another reason why this is common is for ground clearance. This one's pretty simple. The further off of the ground the non functional bottom of the vehicle is, the larger objects it will be able to pass over without contact and damage. And yet another reason for this, is incredible toque put out by a tractors transmission. You may have noticed, your little four door sedan can be more powerful than a tractor, or you may be surprised about this.

It is common to think that the higher horsepower you have, the more your vehicle will be able to pull. This is not always the case.

For example, my school owns a small You may be wondering how so little power, can mean such high results. Well, mostly due to the low gear ratios of the tractors transmission, this is possible. As some of you may know, the larger the diameter of a circle, or the higher the circumference, the larger amount of torque the object will have due.

This is due to a simple law of physics this is also why car differentials were invented. I'll put this into terms that are easy to understand. When you spin a circle, or any shape for that matter let's say a ruler on the end of a pencil "helicopter" style , the outside edges of that object have to spin fast than the inside of the object to keep up with the inside.

The outside edge has a farther distance than the inside to cover in the same amount of time, making it spin faster and with more power. Transmissions use the same excact principle. The larger the gear is, the higher the torque. This means, in first gear in your car, you are using the largest gear in the transmission. Wheels work the same way. Another reason for the rear wheels being much larger than the front wheels on the common depiction of a tractor.

Not all of them is the fact that they help with weight distribution. Commonly, the engine in a tractor will be located in the front, and anyone who's tried to pick up an engine will know, they could definitely shed a few pounds. Now what happens when a baby is sitting on one end of a seesaw and a full grown obese american plops on the other side? You guessed it, bye bye baby astronaut. In other terms, the front of the tractor may tip over. I don't see this mentioned, but it might be as I didn't read every sentence posted here: Rear tires on tractors are generally filled with liquid, and they are very heavy.

This adds to the traction, but also to the weight on the rear wheels. Thus they need to be wider, and being larger, as mentioned above, they present a greater length in contact with the ground as well. Tires designed for multiple uses and turf tend to be wider than ag tires because they need to "float" over grass with less digging in. Also rear tires can carry heavy implement loads, often as great or greater than the weight of the tractor itself.

So, add it all up and you need a larger tire for weight, traction and load capacity as well. My little tractor can lift pounds with the loader but about pounds of implement on the 3 pint hitch. Big wheels also provide better traction.

Pulling power is limited by how much grip the wheels have on the ground. Big, wide wheels have a larger contact patch than smaller wheels. The big contact patch grabs more of the ground and keeps the wheel from slipping. You may have seen strongmen on TV who hold back a pair of cars pulling on ropes. The cars are always high horsepower machines with slick tires, and usually on grass. The tires spin quickly and slip on the grass, reducing the amount of pull the strongman must fight.

You would never see this with tractors, even small ones — the big contact patch keeps the wheels from spinning and lets the tractor pull hard. Traction is crucial for pulling heavy loads.

When you pull something, power only counts if it is delivered to the ground and helps the tractor move forward. If the wheel breaks loose and spins, you are wasting gas and time.

A taller, wider wheel gives the biggest area of contact against the ground. Occasionally, a wheel can stick to the ground too hard. This usually occurs when you are trying to move a fixed object, like yanking a stump out of the ground. The wheels dig in, the stump stays stuck, and the front end of the tractor rises up in the air. This is a dangerous situation — keep going, and you will flip the tractor over backward.

Modern tractors have rollover protection systems to keep you from being squished, but they can still flip and cause problems.

They can flip and cause a fatal accident. There are a couple of ways to prevent flipping a tractor when pulling a stump:. The big tires are essential in an agricultural setting because they are easier on the soil.

The large contact patch spreads the weight out more and provides less pressure on the ground. Too much pressure makes ruts, compacts the soil, and damages crops. This problem is worse if the soil is muddy. Reducing compaction is part of why you see tractors with two or even thee back tires on each side. More tires mean even less weight under each tire so the tractor can float over soft or muddy ground.

Avoiding compaction is crucial for farmers who need to get work done when the season is right, regardless of soil conditions. Big tires are also handy when you need to work a field with growing plants. Aside from leverage, traction, and avoiding compaction, there are other ways big back tires help a tractor work better.

These are less important than the big three, but they still help in lots of situations. Tractors often lift heavy implements including backhoes on the rear of the machine. Big back tires help keep the weight distribution even when lifting plows, mowers, and other items that can weigh as much as the engine.

Smaller tires might dig in rather than turning when a farmer lifts a heavy plow with the back of a tractor. The big back tires help stabilize these loads and keep the tractor balanced when carrying heavy equipment like a disc or a full spray rig.

Tall back tires lift the bottom of the tractor up high. High ground clearance is helpful when you are operating in rough or bumpy conditions. It can also reduce crop damage when plants are getting tall. Mud, brush, and crops are all possible obstructions that big wheels let the tractor float over.

The big wheels are a simple engineering fix to raise the tractor. The tractor is lifted, and the problem is solved. When the wheels spin, the tire starts to throw dirt and dig a hole. If the hole gets deep enough, the axle is resting on the ground. Big tractor tires fight this in two ways.