Activate both gears for a huge speed and power boost! Double Gear also unlocks the Final Charge Shot, Mega Man's ultimate attack! Double Gear can only be activated when health is low, and unlike single gears, it can't be turned off. Once it runs its course, you'll overheat and won't be able to use either gear for a short time. Your Mega Buster will also be slightly powered down.
Double Gear might just save you in a pinch!