27.5"x2.8" Black Black Rekon+ EXO TR TERRA Bicycle Tire eWheels EW 21 Chopper Trike Among the features and benefits Q79 8396 Among the features and benefits that make the Electron Wheel a unique and exciting item is its incline sensor that can measure the slope and applies additional power to keep the bike going forward right when the road gets steeper and the rider needs the assistance The wireless remote key Fob for the Drive ZooMe Auto Flex scooter may be used in lieu of the standard "push & turn" key Well spaced paddle like knobs in the center and large siped corner power through any terrain yet provides better treadwear and less rolling resistance than Maxx Grip