bbrc or skunkworks 2-speed. i have one bbrc, and 4 bs 2-speeds. personally i like the bajaskunks the best. only thing a like about the bbrc is the gear options but really, when running a single cylinder 30.5 or less, the available gear options from skunk works are fine. a bit pricey but seriously, you get gallons and gallons of service and hardly no maintenance is required. the bbrc a plastic bushing that wears out, and the oneways that come with it wear out quiick, even though there is two of them?? be sure to run a cover which ever you decide to get. the dust and dirt is hell on oneways, goes for both units. setup is simple.