I’m not a bike mechanic by nature and tend to send my bikes in to my local shop for any repairs and adjustments. The problem is that I have been caught a few times during races and especially the multiday races where my equipment needed some adjustments. The following two videos from YouTube show you how to adjust your front and rear derailleur.
The first video only covers the rear derailleur adjustment.
The next video covers both adjustment of the front and rear derailleurs as well as cable replacement for your gears.
So now you know how to fix this. Next time there is no excuses for not completing that race because of gears. Happy cycling…