Why do big bulldozers have tracks instead of wheels?

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for better traction in mud. Wheels would just spin. It's the same reason tanks have tracks.

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To move easy

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Simple, Traction. When you are moving a vehicle weighing 80000 pounds and want to move yard of material, you need all the traction you can. Tracks are also less prone to have flats.

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Because wheels don't have enough traction to push lots of dirt around. Tracks are used only when necessary, because they are expensive and require maintenance.

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Better stability and traction. Need less replacement as well.

the tracks spread the weight evenly and allow it to move easier and turn quicker, not to mention go over obsticles like ditches, rocks withot getting stuck and better traction also

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to spread the load

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2 reasons. To distribute the weight over a larger area so it doesn't sink into the soil

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Tracks have a larger contact area and get more traction.

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The tracks are for better traction and also distribute the weight of the dozer over a larger area so not to get stuck as easily. Plus it make for a more stable platform. You can also do better finish work with tracks since they don't give like tires do.

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For a couple of reasons

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1) the weight of a big dozer would require a huge tire to support the load. The engineering required to mount tires that big would change the shape and desig of a dozer enough so that it would lose some of it charateristics that make it such a wonderful piece of equipment (profile, manuerveability).
2) Durability - The steel tracks of a dozer can take much more punishment than a rubber tire and therefore last much longer on these extreme duty pieces of equipment
3) Traction - steel tracks prove tremendous bite which enable the unit to move such huge weights of material. The tracks are designed to cut into the ground instead of roll across it. This is essential to the function of the dozer.

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Actually, the reason that bulldozers have tracks,is more about not sinking than traction. It is true that a "Track" lays more surface area on the ground than a tyre. But the 'cleats' on a 'track plate', are quite small in comparison to an off road tyre tread. However that square footage is rather good at keeping a heavy load from sinking into soft ground. (Its all about surface tension) Once the 'crust' on the ground has been broken, water can penetrate to lower layers and it wont be long before you have a swamp of Mud. Tyre shod vehicles are rather good at churning and mixing the water into the ground and it soon gets out of hand. That's why tracked machinery is always sent in to create access roads etc prior to sending in Moxi Tippers to move overburden from large Civil's Jobs
When levelling off ground, you are actually layering the ground out in 150mm or less bands of material. The tracks help to compact the layers and 'bind' the layer ready for the next 'spread'.
If done properly, this will create very stable and compact ground with little settlement afterwards.

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A track, consists of a track chain, with 'Plates' bolted on. These plates can be flat or cleated and can even have rubber pads bolted on for on-road use.

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So they dont sink in the mud. Footprint of a bulldozer track is so much bigger than 4 tyres so it exerts less pressure (force per cross sectional area) on the mud hence it has better traction and doesnt sink
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