Well, on solid ground like the first tillage pass they help with flotation and traction. If you don't have alot of squirrels under the hood the traction isn't much of an issue but the flotation is. Now, in worked ground they actually use more power than singles however the flotation and traction gained probably outweighs that fact. Better to run a MFWD tractor with singles than a 2WD with duals assuming both tractors are the same basic tractor and large enough for the job. Was told once by an older mechanic, say from the 70's and before that duals were the worst thing invented for tractors. With them suddenly a 100 horse tractor that couldn't pull an implement due to traction problems could now pull it but in a lower gear than designed to and that tore up trannys and rearends since the torque was so tremendous. That reminds me, most tractors are rated to pull implements at about 5 mph and above. If it can't, with the exception of the implement being the hold up, then you need a bigger horse. Look in the manual, probably in there somewhere. WOW! That took up a lot of time and space!
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