@Hasan Saylık
https://upload.wikimedia.org/wikipedia/en/thumb/6/6c/Cannondale_Headshok.jpg/220px-Cannondale_Headshok.jpg
Head Shok suspension fork
https://upload.wikimedia.org/wikipedia/en/thumb/a/ad/Cannondale_Lefty_Fork.jpg/220px-Cannondale_Lefty_Fork.jpg
Lefty suspension fork
https://upload.wikimedia.org/wikipedia/commons/thumb/1/1d/CannondaleLefty.JPG/220px-CannondaleLefty.JPG
Cannondale with 'Lefty' fork racing at Fort William, Scotland
Cannondale has also developed a suspension fork called the Lefty. It started with the "Headshok" (aka "Fatty") forks. It uses 88 needle bearings to reduce friction for smooth travel with the bearings telescoping inside the steerer tube of the fork. This minimizes flexing of the fork legs and also reduces static friction, which must be overcome before the fork begins to travel.
The "Lefty" is an unusual looking fork because it only has a left side or blade. It uses the same technology as the Headshok, but desire for greater amounts of travel led to the movement of the telescoping unit off to the side to allow room for the travel. It also allowed for more mud clearance as opposed to traditional forks designs. The Lefty is now seen on many of Cannondale's high-end models, such as all the Scalpels, Rizes, and the expensive models in F series, both cross-country lines. Continual efforts at weight reduction have provided models with a carbon fiber upper tube and a titanium spindle. The titanium spindle was later replaced with a lighter and stiffer forged aluminum version. The carbon fiber upper continues to be used on the highest-end Lefties.
The availability of repair and rebuild components and experienced service technicians for Cannondale forks is much less widespread than Fox, Manitou and Marzocchi designs. However some companies have recently begun to specialize in servicing Cannondale suspension and offer mail in service. This continues to limit the Lefty to mid and high end bikes. Numerous companies now produce adapters that allow the use of Leftys on virtually any mountain bike, with few limitations on choice of headset or stem. With these adapters, riders are free to choose their components and are not restricted to Cannondale house brands or Cannondale-specific parts. Lefty forks are also only compatible with disc brakes. Some of the benefits of the Lefty fork are that it is lighter and laterally more stiff (due to dual crown assembly). The Cannondale Lefty uses needle bearings instead of traditional fork bushings, which allow for more responsive feel, and do not bind under torsional pressures. Another unique trait is unlike a traditional front fork, the lefty allows user to change the inner tube or tire with the wheel still mounted on the bike.
