Originally Posted by
veganbikes
In the end save your money for a more practical bike. If you have a bike with tourney do not upgrade it beyond basic safety parts to keep it running safely enough till you can get the right bike for your riding. While yes these derailleurs will be a slight improvement the rest of the system is tourney and is really for that short use starter bike or something that gets ridden infrequently due to not being able to ride more. Ride the bike, enjoy the bike, replace the minimal amount of stuff and save that money towards the bike you want or at least a bike that makes more sense for your riding. You will be much happier in the end.
Tourney has been showing up on lots of bikes that are of far better quality than the Tourney derailer suggest they are. There even seems to be a few levels of Tourney depending on where the bike comes from. HelMart bikes come with the lowest level Tourney that is made of Slagesium and really can’t be tuned to work properly. The Tourneys on higher level bikes are a bit better and similar to what you can buy after market. They can often be set up to work well for at least a while but not for long.