Ok, some research later, it would appear that TZ85s are unidirectional ESCs. I didn't realize some ESCs were only one-way. Obviously they have been made reversible by the BotBitz hack, but that's for brushed motors. Does anyone know how to program them to be reversible, or could you suggest an appropriate reversible brushless ESC for the motor if this isn't possible? Would something like this be appropriate?: http://www.ebay.co.uk/itm/EZRUN-120A...IAAOSwwPhWil9e