I just purchased a Shimano TX50 6/7 Speed Derailleur for my bike however I'm having a bit of trouble.
I have 7 gears at the back but when I try and change to first using the new derailleur it just won't go, if I manually move it to first and then change down it will skip a gear for example changing from 1/2 will make it go to 3.
Do I need to set it up differently for 7 Speed as it supports 6-7 or does it seem like a gear cable problem?
I'm still a complete noob on the bike front, apologies if it's an idiot question or explanation!