I have an older bike (between 10 and 15 years old), which has a alivio derailleur. It's an 8 speed, and I just replaced the cassette, chain and crank set. I noticed that there was a large amount of play in my derailleur, so I reckoned it's time for a new one. Will this shimano acera derailleur fit instead of a new alivio one? They are quite a bit harder to find, and I'll just go for this if it's the easiest option.
I replaced it this afternoon and it worked perfectly; thanks for all the advice.