The Gravity Line bolts and skewers harness the power of gravity to prevent the removal of wheels - when the bike is upright, the bolts & skewers are locked and can only be unlocked with the bike turned upside down. No special keys required.
Kryptonite's Gravity Line helps you secure your wheels smart and easy - no special keys are required as the locking skewers and nuts utilize gravity to secure your wheels when the bike is upright. They can only be unlocked when the bike is turned on its head - and flipping the bike is not possible if it's locked properly.
The Gravity Line skewers and nuts can be installed easily in place of existing skewers and nuts. They don't require any special keys to lock and unlock, just a standard hex key or a wrench. With the help of gravity, a pin is moved so that the nuts/skewer cannot be opened when the bike is upright. When the bike is turned upside down, the pin moves and the nuts/skewer can be loosened.
The Gravity Line's WheelNutz are meant for solid axle wheels and come in M9, M10 and 3/8" diameters. All that is needed for installation is a 15mm wrench. The WheelNutz are sold as sets for one wheel. Each set is lightweight at only 80g.
The Gravity Line's WheelBoltz are meant for hollow axle quick release wheels. The skewers come in industry standard lengths - 130mm for the front and 150mm for the back. All that is needed for installation is a 5mm hex key (included in the package). The WheelBoltz are sold as a set for front and back wheel. Each set is lightweight at only 120g.