Hello!

I want to fix my niece's bicycle with a maximum budget of $100. It's an old Next bicycle that has served her family well for over a decade so there's a lot of sentimental value over it. I need to replace the stock derailleur (TD-One Torque Drive System) with a basic one such as a Shimano Tourney TX-35 for better shifting because I think it is bent. I understand that I might need a derailleur hanger such as SunRace SP550 Rear Derailleur Bracket but I am not sure if it'll fit. My brother has already replaced the tyres and tubes so it's up to me to replace the derailleur. I think I can manage it but I need some advice on what derailleur should I purchase.

Any advice, except on getting rid of the bike, is welcome. Looking forward to reading all your responses. Thank you and have a pleasant day!

https://www.rei.com/product/205273/m...B&gclsrc=aw.ds

​​​​​​https://www.amazon.com/Shimano-Tourn...a-798607109418

dedhed has good advise. Also don't overthink it. If you can get a standalone bracket and have a hanger alignment tool you might be able to get slightly better performance with it, a alignment tool, and a slightly better derailleur (Acera ish quality), but honestly at that kind of quality level anything reasonable, fresh, and not broken will be a meaningful improvement.

I have no idea what a hanger aligment tool is but, you know what, I'm all in on learning how to use it, I think it's going to be fun messing around. Thank you for your advice!

Cool! Thank you, I'm going to get these ASAP.

People who ask this kind of question aren't going to have or buy a $50-$100 DAG tool, nor do you need it for a 6-7 speed NEXT bike. An eyeball and an adjustable wrench are sufficient and by purchasing a claw mount RD it's not as big an issue. Of course a kid is going to drop the bike on the derailleur side in the first week and bend the new stuff.

​​​​​​https://www.theproscloset.com/blogs/...ailleur-hanger

Don't bother, you won't' need it.

+1.

Oh! Ok, thanks!