Originally Posted by Vittorio
...Now I am now riding a specialized roadracing bike with shimano 9 speed gruppo. even after i try several lubes, triflow, ice wax, etc, each time applying every 500km at least, the new narrow chains stretch +5mm after only 2 000km to be replaced...is 2 000km, (1 200 miles in america) good for the narrow chain? or am i doing something wrong?...
I can't tell you if you are doing anything wrong. I can only tell you my experience. Maybe you can find something useful there.
The whole chain is 5 mm longer? How much longer are 12 links? I replace my chains when 12 links become 1/32 inch or .8 mm longer. I typically get over 4000 miles from a 9 speed Dura Ace chain before 12 links become 1/32 inch longer. I don't know if the Dura Ace chain is better than the Ultegra, but it's only a couple of dollars more so I get it.
Are you riding near sand or loose dust? You should get more than 1200 miles from the chain!! Try to lube/clean it more often. Every 500 Km may not be enough. I lube my chain about every 100 miles or 160 Km. I don't ride in wet conditions. My chain stays very clean, too, because I use a wax-based lubricant called White Lightning. In my opinion it is the best if used properly.
Tom