Some very practical advice. Thanks everyone. It's very frustrating when purists say that everything needs to be replaced at the exact correct time, and you can't go a little over the limits. Sure there the chainring like the table saw which is no good, but most people who work and live a busy life don't have time or money to forever maintain bikes at optimum performance. For most people, good enough is acceptable, so I really appreciate you guys taking that approach here.