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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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