Shimano saint m810 rear mech mode convertershimano saint mode converter allows the user to adjust for am or dh depending on the cassette ratio theyre using am would be 1132 or 1134 whereas dh mode would be anything smaller 1123 1225 or 1128 a 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products buy shimano components from chain reaction cycles the worlds largest online bike store