Yet another winner from Shimano. The Dura-Ace CN-7901 chain features the world's first asymmetric design. The outer plates are shaped to reduce the chance of the chain dropping between the chainrings and the inner plates are made to interface with the cassette cogs in a precise manner reducing drivetrain friction and helping to deliver more watts to the rear wheel. Other benefits are smoother shifting under load, quieter performance, and improved durability. Cutout side plates and hollow pins bring the weight of the chain down to 252 grams saving about 18 grams from the 7801 chain. In a nutshell, it is smoother, lighter and more expensive than it's predecessor. Works on all 10 speed Shimano drivetrains, in fact you may find it improves shifting performance on other manufacturers drivetrains too.
Initially when this chain was introduced, Shimano included a quick-release master link. It actually installed quite easily, but wore quickly and tended to cause a variety of issues. Needless to say these links have gone the way of Bio-Pace, Positron, Santé, Dual Control and other attempts of engineering success. The 7901 chains are now issued with the good ol' tried and true HG chainpin. It works perfectly, just like always and is totally reliable.
Well, this quick link is excellent for me,I ran almost 4,000 miles on my bike and thats right,quick link became worn,just needs to replace chain set again.I hope this quick link stays for long.
The chain is smooth , quite and durable , although the quick link sucks throw it away.
Smoothest chain ever. Dont use a Shimano quick link. Use one from a Wipperman or buy an aftermarket one.
I am a Campy fan, but this chain is great. It is quieter and quicker than Record 10 when installed on Campy drive trains.
Installed DA 7900 group with 7900 chain in April 09 and it is great! Been trough five chains in 5500 miles(I always change every 1000 miles) no issues. Smooth shifting, quiet, and good lifespan. Love the quick-link and was sad to see it go. It gave me zero problems. I keep my bikes ultra clean and tuned. The link was a nice feature when cleaning. Bring back the quick link Shimano!!!! Give the people what they want!
Another thumbs-down for the new quicklink. After just a few weeks riding, it started to tick lightly, then became louder. Its a pity, because the link is very easy to remove & install.
Put on the 7900 chain a few weeks ago on my 7800 drivetrain. Worked really well, quieter than the 7801 chain I had on previously. Used the chainpin it came with, no problems with installation.
Please be aware that while the quick link connector is a good idea and is quite easy to install, it wears quickly and becomes excessively noisey. It feels like you have a bottom bracket problem. Please install with a pin to avoid hassels.