Because it's basically a copy of a primitive much earlier Suntour mech; no sprung top pivot, outdated geometry etc.Why do the Paul mech shift badly?
They look sturdy enough so if the cage has good spring tension and the pivots aren't floppy then what is wrong? Friction shifting allows for less than ideal construction, too.
You mean you give them your RD-M900 + about 700 extra quid. Which makes you the ultimate fool ... good job.I have never used one but they look good and make a bike if people have them and dont like i glady take them off there hands and give them a m900