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A few days ago the cog on my Schwinn Ranger rear bike derailleur broke in half after changing gears.

I examined the cog and it was made of flimsy plastic. Was wondering if I could put a new/different rear derailleur on there for this same make and model but of higher quality, with metal cogs.

The bike derailleur that was on there before was a Shimano tourney tx which go for about $6 online. Want to upgrade but not sure how to go about it or what is the correct ratios and such for it.

I know with car parts everything has to be in accordance with the brand and specs. What rear bike derailleurs would be the best fit for a Schwinn Ranger? 21-speed.

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  • Plastic? That suggests one of your jockey wheels has broken. These parts are available separately, so you don't need a whole rear derailler mechanism.
    – Criggie ♦
    Jul 10, 2016 at 5:51

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Any Shimano rear derailleur designed for 7 speed (3 front x 7 rear gears = 21 speed) drivetrains and mountain bike gearing will work.

For your practical purposes, the compatibility chart from Shimano below gives part numbers for the available rear derailleurs which will work with a 7 speed MTB drivetrain:

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Those part numbers can be specifically matched for each derailleur.

To break down the part number I will use RD-M360 as an example.

"RD" = Rear Derailleur - "M" = Mountain Bike - "360" = model ID number
"RD" = Rear Derailleur - "TX" = Touring Bike - "800" = model ID number

Typically, the higher the model ID number, the better quality the part.

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    No problem Don't forget to upvote, if an answer is helpful. :)
    – zenbike
    Jul 9, 2016 at 16:22

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