Name goes back some 15-20 years ago when first proper tubeless components were introduced (tubeless ready tires, tubeless wheelsets like mavic demax, which are not drilled throught etc) but a lot of us scrubs couldnt afford those and sealants were not as good as they are today so if not using proper parts the setup most likely wouldnt hold air and a ghetto setup was invented by cutting a 20" innertube and streching it over a rim and then mounting a tire, so the cut innertube would rest between the tire and the rim effectively sealing it. Combined with the...