The SRAM X0 product line is setting a new benchmark: Mountain Bike shifting at the Formula 1 level Never before has a shifter and rear derailleur been faster, lighter and more precise than the new SRAM X0 system The new X0 Rear Derailleur has a carbon cage and new design The X0 Triggers have been added to the line, and with their patented ZERO loss travel™, you'll enjoy the fastest fully adjustable shifting ever The X0 Twister remains a part of the family giving more options to choose shifting styles SRAM X0 - The new dimension of shifting! Travel does matter: Lost travel: All standard shifters need 7 to 15 degree of lost travel" just to engage the shifting pawl before you even begin to shift gears X0 is the first trigger type shifter with zero degrees of "lost travel" - ZERO loss travel™ - The pawl is always engaged!"