BPA Racing Official (Slack Setter). I came across this company and the “Slack Adjuster” product when I was looking for a way to keep my chain for my Vstrom 650 adjusted correctly. I am guessing most people know the basics of how to adjust a chain but getting that perfect setting is a pain in the rear end each time. All that measuring, adjusting, re-checking and adjusting again. In fact my local mechanic who I use for my servicing sets it perfect every time and once it starts to get loose again I will adjust it myself during services but …