Intrepid twenty on speed, getting information and understanding the gears?
okey so if you have to keep the chain preaty straight to keep the chain live healy.So  from what i was told, if you ride with the smalest gear on the front on the back you have to use the bigest the second bigers and the tird biges. if you use the midle gear on the front on the back you can use the 4th bigest,5th bigest. and if you tide on the front the bigest gear you can use the 6th bigest and the last one with in you case is 7th (that was what i was told if its wrong im sorry).