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Criticism is something we can avoid easily by saying nothing, doing nothing, and being nothing

Elbert Hubbard

Friday, May 9, 2008

Start Saving your Pennies!

Shimano Dura-Ace 7900 mechanical




STI levers

  • - New shapes, more ergonomical
  • - Under-the-tape derailleurs cable housings
  • - Bars/lever reach adjustement
  • - Right lever shift engagement stroke 20% shorter
  • - Carbon levers
  • - Titanium hardware
  • - Not compatible with 7800 derailleurs





Calipers
  • - Improved geometry, more braking power
  • - New brake pads, 210% better braking performance under the rain and 120% in the dry
  • - Titanium hardware




Rear derailleur
  • - Improved cable pulling system
  • - Carbon pulley plates
  • - Compatible with bigger gear range with no triple derailleur required
  • - Not compatible with 7800 levers





Front derailleur
  • - The plates geometry and width avoid you from trimming, whatever the gear used
  • - No unwanted friction of the chain on the plates
  • - Spring tension is optimized for very smooth chainring shiftings





Crankset
  • - The carbon crankset seems to be abandonned
  • - New alloy cranks:
  •    * obviously hollow, the walls thicknesses are reduced from the 7800 version
  •    * Claimed to be the lightest crankset made by a big manufacturer
  •    * Even stiffer than the 7800
  • - New carbon/alloy bottom bracket for further weight save





Chain
  • - New design:
  •    * quieter chain
  •    * Power transfer increased of 0.6% if used in combination with the newest 7900 chainrings
  •    * No rubbing with the front derailleur if used with the 7900 chainrings
  • - Quick Link for super fast assembling and disassembling





Cassette

  • - Shifting improved
  • - Lighter cassettes thanks to the alloy cogs carrier
  • - Wider offers (11-25, 11-27, 11-28 beside the current offers with 7800 Dura-Ace)





Flight Deck comptuter

  • - Still integrated in the shifters
  • - Additionnal functions:
  •    * hearth rate monitor
  •    * altimeter
  •    * slope indicator
  •    * wireless 2.4GHz frequency
  •    * wireless datas downloading to the PC


7900 prototype levers in alloy
Photo © Fiets.nl



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