I know in industrial applications for instance conveyor systems they will use a double chain with long belt runs. With these buggies I would say it is due to the weight and mass of the drive train. An atv is much lighter than the buggy. I have 2 single seat buggies the Blade with a double chain and a Challenger with a single chain. The Blade rarely needs adjustment and sprocket has no wear on it even after 12 years of use. My challenger will need adjustment more frequent and the sprocket will wear quicker. I have had the challenger since 2009 and it has been driven half of what the Blade has been driven. I had to replace the axle sprocket and chain. The main difference of the 2 is the Challenger I will adjust the chain with no slack, the blade has to have 3/8" to 1/2" slack.
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