Here's a quick, poorly taken video of what happens when the Quick-Link wears prematurely. This is not good. What really gets me hacked off is that to date, instead of coming out and admitting that the Quick-Link is defective because it wears faster than the rest of the chain, Shimano has quietly stopped shipping 7900 chains with the Quick-Link.
Here's a direct message that I received from @ShimanoCycling on Twitter after "shaking the tree" all day yesterday...
"ShimanoCycling: The link is not up to Shimano standard and can wear out/stretch before the rest of the chain. The link can cause noise or skipping issues. We will send out “7900pinkit” (which is 10 links and 2 connecting pins) to replace that section of the chain. You may only have to use the connecting pin or add links if the chain if it’s too short one the quick link is removed We are not asking for the quick link back-discard properly."
I guess my beef is when is Shimano going to let everyone who dropped $70 on their 7900 chain know that this is an issue...
Don't use the 7900 series go with the older 7800, there are compatibility issues as Shimano has made changes to the way the 7900 works when compared to 7800 and earlier.
Posted by: Roof racks for cars | March 24, 2011 at 06:59 AM
Great post as usual. I like your writing style. Thank you.
Posted by: online casino sites | December 24, 2010 at 02:50 PM
I should make use of the internet more often. was having this knocking feel on my crank for the last several hundred miles. I have been looking for the knocking feel, replaced my cogs, tighten my pedals, removed and uninstall the rear der. and the whole crank. no luck, till I saw this video. checked my quick link, right at the exact place as the video, thats where I feel the knock. Its not as bad as in the video though. thanks!
Posted by: Joe | June 28, 2010 at 12:15 AM
Thanks you so much for the info. Tried so hard to isolate the problem, have been dealing with a clicking sound issue that seemed in sync with my chain...now I know why!
Posted by: ryoon | February 19, 2010 at 12:21 PM
I have found this link to be crap,as an exercise, measure your chain with a chain gauge Chances are if your chain has more than a thousand Kms it will be ok each side of the link but will fail across the link.(This is using a parktool CC-3)
Posted by: chris | December 26, 2009 at 07:35 PM
I have not had problems with 7900 Quick Link but early days. It would have been nice to see some of the other links engage on the cog/cassette to show the difference.
Not good to hear nothing official form Shimano.
Posted by: johans | December 24, 2009 at 02:57 PM
Awesome video. I have been googling "7900 chain recall" and found zilch. Last Summer Shimano sent our shop a bunch of connecting pins and told us to swap them for the quick links in all the new chain boxes.
It's too bad a company that innovates and leads the industry in so many ways has to act so shady.
Posted by: TwoWheelMotion | December 20, 2009 at 12:41 AM