If people had slippage issues then something wasn't nearly designed/setup right. It is a hard statement for people to really listen to, but it's important that I say "when it is designed properly" That means the ratio between gears, belt dimensions, tension, system deflection, etc. must all be taken into account. Too many variables on a bike I only have 1/2 a picture of to analyze this one in particular, but my goal was just to say that there is nothing inherently wrong with a belt drive for a single ratio system.