I last changed my 7 speed cassette / chain about 10,000 kms ago. This is on a bike that only gets out in the sun and is cleaned and oiled regularily. I spin and don't grind out the gears below 90 rpm.
I mentioned this to my lbs and the owner was suprised as he said, he's finding his riders are changing them about every 5 or 6,000 kms.
I went home and checked the change before the last one and I changed it at about 10,000 kms. as well.
I'm not having any problems from exessive wear on the drive train and I'm thinking of waiting another 2 or 3,000 kms. before I change the set up.
How many Kms. does everyone here manage before changing the drive train? Am I odd for getting so much more milage before a change?