[subxero]

i honestly don't know a whole lot about it other than it is very popular on the west coast with racers. I know they get used on smaller 2stroke dirt bikes like ktm80/85 they make probably close to 25hp

The racers tend to use the non 0ring chains because that is all that is available and they have a little less rolling resistance than the o-ring ones. This is the first 0-ring chain of that size i have ever seen so figured i would share. I figure racers as well might be replacing these chains very often. Perhaps one can chime in and give their 2 cents.