Ok - so these 21g sliders are pretty good, but it seems about 800 to 1000 miles after I install them all the sudden your riding along and notice the RPM's on the freeway are back up to about where they are with the rollers. I take it all apart and find that 1 or 2 of them will be flipped backwards. I correct this, blow out the dust and its good for another 1000 miles. This morning I looked down to see 7000rpms at 80mph indicated so I know they have flipped again. I don't understand why, my variator doesn't have ridges at the top and otherwise I haven't altered anything. I like them alot but I am getting tired of taking it apart constantly to fix this.