FOR IMMEDIATE RELEASE
Shimano Dura-Ace Receives Carbon Crank Option
IRVINE, CA: Shimano debuted a carbon-fiber laminate Dura Ace hollow crank at Eurobike 2007. While carbon cranks are not new to the market, Shimano opted to continue to study and develop different types of construction in an effort to create a well balanced use of the material that is not only light weight, but also exceptionally rigid. Using knowledge gained by years of successful manipulation of carbon fiber in cycling shoe soles, rims, and other components, those goals have been realized with the new Shimano Dura Ace carbon crank. Prototypes used by professionals in competition over the summer provided final real world confirmation.
The Dura Ace FC-7800C carbon crank uses an aluminum hollow-core base that resembles an aluminum Hollowtech II crank design. The difference is that the aluminum is significantly thinner because a carbon fiber laminate layer completes the construction to achieve the uncompromising Dura Ace level rigidity and strength at a weight lighter than all aluminum construction. The aluminum base ensures that the achieved stiffness is multi-dimensional for better performance in the field where cranks are stressed in more than one plane. At just 709 grams including bottom bracket, the carbon construction manages to save over 30 grams from the standard aluminum Dura Ace crank/bottom bracket assembly and actually increases rigidity by 10%!
The bottom bracket and left arm construction is the same design as the latest version of XTR allowing for a lighter bottom bracket assembly and more precise adjustment of the bearings. Pricing is still being finalized, however the crank will be available in Spring 2008 in 3 crank arm lengths and 2 chainring combinations.
Specifications:
*Hollowtech II construction
*Hollow carbon fiber laminate arm
*Gear combinations: 53/39, 52/39
*Lengths: 170, 172.5, 175
*709g including bottom bracket
*Available: Spring 2008
*MSRP: TBD
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