Hi all,

First of all, sorry if I am in the wrong section, I am first time on this forum ^^

I have a normal `mountain` bike for every day cycling...Yesterday, during the ride, my rear derailleur snaped....
Me having no idea in bikes, I am looking after some help.
I found "Shimano Tourney Rear Derailleur RDTX31G" on amazon for 10 pounds but I have no idea how they differ and will it fit my bike?
I have 6 `cogs` on the back which would mean 6 gears?

My questions are, will this part fit or which would and which would not?
What else will I require to change it, any other parts needed?
Will I need to buy a new chain or just buy chain disassemble tool and re clamp it back?
What tools will be required? Because I live in uni and I dont have my tools with me, so I will have to purchase them.

I am trying to fix my bike as cheap as possible so please bear this in mind.

Thank you, hope to hear some help from you guys

P.S - Picture attached just in case anyone wants to see it.

Make sure you get one with the claw attachment. Some don't have them.

This particular one does.

A chain break is not necessary if you have the proper sized allen wrenches to undo all your derailer pulleys and don't mind futzing around with them. Looks like you'll only have to take off one pulley from your old derailer to get the chain out of it. You'll pretty much have to mostly dissassemble your new rear derailer to route the chain, however. Make sure you reference lots of pics of rear derailers so you know how the chain is supposed to be routed.

Thanks for your reply,

Would be a hard job disassembling the derailer? I just don't wanna mess up a new part
Also, what type of grease or lube would be best for chain?
When I am gonna change the derailer I wanna make sure it will last for a bit longer

Thank you.

It's not hard to disassemble a rear derailleur. Just make sure you don't overtighten the pulleys when you put them back on. For lube, I like to use Three-in-One oil, which can be found at any hardware store. There are some bicycle-specific lubes out there, but they cost a lot more, and I wouldn't waste your money.

Disassembling is never hard, its assembling that may be hard
Thanks for the info guys! I will try and get all the parts together and replace them, just wanna do it properly instead of a quick change which will lead to problems soon

Thank you once again!