replacing walmart rear derailuer with shimano

[cmg]

Nephew has a Walmart mountain bike. It has a 7 cog rear cassette and a stamped steel Shimano long cage rear derailleur. After the first crash he has bent the rear derailleur and mounting tab on the frame. my brother and I spent the afternoon making it work. If I replaced it with a shimano 105 rear derailleur would it work? What came from Walmart is too flimsy. anybody done that?

[oldpotatoe]

Nephew has a Walmart mountain bike. It has a 7 cog rear cassette and a stamped steel Shimano long cage rear derailleur. After the first crash he has bent the rear derailleur and mounting tab on the frame. my brother and I spent the afternoon making it work. If I replaced it with a shimano 105 rear derailleur would it work? What came from Walmart is too flimsy. anybody done that?

Yes, a 7/8/9s shimano rear der would be fine as would any other, non 10s/11s shimano rear der.

[tourmalet]

[deleted incorrect info]

[Geeheeb]

Altus RD-M310 punches above its weight for less than $20

[AngryScientist]

but did you manage to align the rd hanger after bending? no RD is going to shift correctly unless you get that straight.

[ColonelJLloyd]

but did you manage to align the rd hanger after bending? no RD is going to shift correctly unless you get that straight.

Agreed. Make sure it's aligned.

Altus RD-M310 punches above its weight for less than $20

Truth. This is what my LBS stocks for to get lots of folks back on the road who are looking for minimal layout.

[cderalow]

Maybe, depending on the exact 105 derailleur model. The sprockets on 7-speed freewheels are spaced differently than on 9- or 10-speed cassettes. If you slap on a 10-speed 105 derailleur on the bike, indexing will not work.



You can get a Shimano Altus 7-speed RD for less than $20 online.



10s mountain wouldn’t work but 10s Road will.

This is coming from someone who has a 10s 105 rear with alivio 9s shifters on a hybrid.


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[oliver1850]

Another vote for Altus/Alivio. I have a NOS M410 here that I robbed the cable adjuster from, $18 shipped. Here's an Altus on ebay with low initial bid:

https://www.ebay.com/itm/SHIMANO-RD-M310-ALTUS-7-8-SPEED-BLACK-DIRECT-MOUNT-REAR-DERAILLEUR-NO-PACKAGE/292367183791?hash=item4412712faf:g:JBgAAOSwmwtaJZH ~

[Cicli]

Maybe, depending on the exact 105 derailleur model. The sprockets on 7-speed freewheels are spaced differently than on 9- or 10-speed cassettes. If you slap on a 10-speed 105 derailleur on the bike, indexing will not work.

You can get a Shimano Altus 7-speed RD for less than $20 online.

Spacing is done by the shifter, not the derailuer on 10 speed Shimano road and down. A 5700 derailuer will work. I ha e a 5700 on my kids 7 speed. It works fine.