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]

Originally Posted by 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?

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]

Originally Posted by AngryScientist

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.

Originally Posted by Geeheeb

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]

Originally Posted by tourmalet

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-...gAAOSwmwtaJZH~

[Cicli]

Originally Posted by tourmalet

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.