my rear sprockets were more worn than your 10,000 / 11.000km, I am trying to finish the third pulley and I expected a fourth pulley as collateral, the third pulley I buy on ebay 119$/150 euros with the delivery to date it has increased by 70%
http://www.ebay.com/itm/BDL-Solid-Full-P...=item3a9efcb999

I have the properly adjusted, it will not last longer than the original

if no term solution in the rear pulleys envisaged by morgan ssay I'm going to make a steel rear pulley that is attached to the pulley original aluminum, the problem is that I own than conventional machines, it takes a lot longer than in digital machines.