Originally Posted by
harshbarj
I have had 2 derailleur based bicycles and they required constant adjusting. Seemed every week or so the system needed adjusting to keep it from skipping gears. I also had to replace on average a chain every 2 - 3 months and a rear cog every 6. I ride an average of 300-400 miles a month in the winter and much much more in the summer.
I have been using derailleur systems for decades and they have seldom given me trouble. Mine need minor adjustments or cable tightening once or twice a year. The only exceptions have been if I have ridden a bike hard on snowy roads or on muddy loose surface roads. Even there, it takes quite a lot of riding before the drivetrain gives me trouble. I don't understand why your bikes need such frequent attention.