Shimano Dura Ace Chain CN-7901
.
Be careful, CN-7901 and CN-7900 are different chains and don't work on same parts, please check compatibility links at the end of this article.
The new asymmetric design of the Dura-Ace Redesigned plates that improve the contact interface with the cogs. Other improvements to the links provide greater durability and life with less noise and smoother function. Use of hollow pins drops weight by over 18 grams even with the addition of a quick connection / removal link.
Redesigned outer plate | Reduces chain suck
Redesigned asymmetric outer and inner plates | Better contact with gear teeth and smoother shifting, high efficiency pedaling
Hollow pin and perforated plates
Lightweight & strong.
Note: In order to obtain god gear shifting performance, the CN-7901 has a forward side and a reverse side, and the sides are marked so that the CN-7901 will face the correct way when installed.
Model Number: CN-7901
Series: DURA-ACE
Chain Type: Super Narrow HG for 10-speed
Cassette Compatibility: 10-speed
Pin Link Plate Hollow Link Pin
Roller Link Plate: plated
Average Weight 252g
Use
Shimano Chain wear indicator tool, TL-CN41
tool and
Shimano TL-CN27
.
This chain uses
pins Y08X98011 
(pins have 2 grooves)
Japan Retail price (116 Links) 4.405
yen (see cross rate here)
7900 series parts are compatible with 10 speed parts Only.
Compatible with Shimano Cassette: CS-7900, CS-7800,
CS-6700, CS-6600,
CS-5700, CS-5600.
Compatible ONLY with the following Shimano 10 speed crankset:
FC-5700,
FC-5750,
FC-6750,
FC-6700,
FC-7900,
FC-7950, also works with FC-7800
C (Does not work with FC-7800).
Does
NOT works with
FC-6703 and
FC-5703.
This is for road bike usage will also works for cyclo-cross / randonneur / touring, etc...