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| Shimano Dura Ace 7900 TT 10 Speed Groupset
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The 2009 7900 Series Dura Ace road racing group set made by Shimano is 135 grams (4.76 ounces) lighter than Dura Ace 7800 and provides more of a black and silver hi-tech look.
Dura Ace 2009 (even though we are still in the year 2008) ups the ante on cycling component choice, performance, and value.
FC-7900 Dura-Ace Hollowtech II Crankset
Std or Compact
20% stiffer than 7800 series crank
Hollowtech II hollow forged arms
Hollow chainring construction for added rigidity and light weigh
Re-profiled chainring teeth for more efficient chain contact and power transfer
Available in FC-7950 compact gearing (50/34)
Lengths available: 165 -180mm in 2.5mm increments
Ratios available: 53/39, 52/39, 52/42, 54/42, 55/42, 56/44
15 grams lighter than 7800 series
Bottom bracket seals improved to reduce bearing contamination and seal friction
725g (170mm) including bottom bracket
ST-7900 Dura Ace Dual Control Levers
Unidirectional carbon fiber lever blades reduce weight without loss of durability
Titanium clamp and fixing bolt
New perch shape is more comfortable over longer distances
Integrated reach adjuster provides a custom fit for even smaller hands
Redesign internal shifter mechanism allows for hidden cable routing without increased friction
Rear shift stroke reduced by 20% for faster rear shifts
Revised brake cable pivot location provides better braking modulation
40 gram weight savings per pair over 7800 series
FlightDeck ready with wireless integration and built in buttons 378g
CN-7900 Dura Ace Hyperglide 10-speed Chain with new Quicklink
Asymmetrical design allows the inner and outer plates to be optimized for front and rear drive shifting performance
Outer plates designed to help reduce chain suck on the chainrings
Inner plates designed to enhance the interface with the cogset for efficient power transfer
Hollow pins for lighter weight
New link designs improve drivetrain smoothness and reduce noise
Uses new SM-CN79 quicklink reusable connection link for tool-free chain removal and installation
Can still use 10-speed Hyperglide connecting pin
18 gram weight savings over 7800 series 252g |
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