.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 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-7800C (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...
You note that 7900 and 7901 chains are different, and don't work with the same parts, but you don't say *how* they are different (or which parts 7900 is compatible with and 7901 is not, or vice versa).
ReplyDeleteI've just installed a 7901 chain on my SRAM Red drivetrain (except for a 6700 cassette), and it runs very rough with clunking / skipping feeling in the cranks every few chain links. Whole drive train is new, so wear is not an issue.
I'm wondering what is different about 7901 vs 7900. I've read stories of lots of people using 7900 on SRAM with great success.
Hi Eric, the difference between the 7901 and the 7900 is a minor tuning on the outer link. (From 7900 to 7901)
ReplyDelete(Assuming your bike is well tuned) The chain "clunking" is what Shimano refer to as compatibility, the chains basically will work on almost all 10 speed chainrings but depending of certain brands and chainring tooth shape the chain does not work smoothly.
Which chain did you use before the CN-7901?
Hi,
ReplyDeleteI had been using a SRAM 1090R chain.
However, more experiments are leading me to believe that the new 6700 cassette is causing the problem. It seems like the chain is becoming a bit wedged between the cogs, and so is not releasing smoothly when pedaling. This seems to occur only with this cassette; other wheels / cassettes don't seem to have the problem.
The problem may be that some of the cogs are too close together, thus binding the chain. This could be caused by the plastic spacers compressing, or imprecise construction of the large cog spider. I'll test more combinations to see if I can pin it down.
Eric, another potential issue could be your crankset chainline (distance from the chainring to the center of the BB axle)
ReplyDeleteWhat would be interesting is to test with a different BB and crankset brand altogether.
I find it strange the issue being the Shimano cassette.
Let me know your progress, it will also help me to update chain compatibility and issues.
Micka
So in general it works with all 105 parts
ReplyDeleteHi Dan, yes it will work as long it is 10 speed stuff and you mount the chain in the forward direction. Only possible issue would be the chainline if you use Hollowtech BB from another brand, use XTR BB spacers to play with line if the chain catch the chainring like with the Sram issue above.
ReplyDeleteMicka