hello. first, please forgive my english. i speak five languages, all poorly.

for many years, i ride old 7 speed, suntour 6 speed, also campagnolo 5 speeds. those chains last even to 5 000km before they stretch. +5mm too long, and i replaced, to save cassette life. in good ride weather, i got two months from a chain, no problem.

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.

i am no giant, at 69kg, and i am no giro d'italia champion as i average 25 - 26kmh over time. but i ride sometimes 2 500km each month in summer, this means i replace the chain as much as every 3 weeks!

is 2 000km, (1 200 miles in america) good for the narrow chain? or am i doing something wrong? if you discussed this before, can you direct me to the thread?

thank you!