Having problem right from the start with chain dropping to the outside of chain-wheel while in smallest cog with medium pedal pressure applied. (It gets held in by the inner and outer chain-wheel guards). I can use rear derailleur to get it back on by shifting to at least middle cog. I adjusted small-cog derailleur stops and pulled derailleur guard out for no interference with no improvement. I am currently adjusting rear axle positioning with the idea of reducing the obvious huge amount cross-chain alignment. The cross-chain alignment is like a front derailleur trying to shift the chain onto the non-existent "next chain ring". Jury still out on that attempt. Anyone else facing this issue?