OK, so, with a spring loaded chain tensioner, the problem is when starting, the TOP end of the chain can go too slack, and bind/lock the wheel. Well, I added an UPWARD, spring tensioner to it, and now...no problem. Whether on start up, or at speed, when going slower, downhill, it keeps the TOP side of the chain alligned/tight. The upward, spring-loaded tensioner handles lateral movement, AND tension, soooo.. no chain slip/lock. It works WITH the downward motion of startup, and pushes UP on the topside chain to keep it tight/alligned! NICE! Working good so far.... Happy riding!