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What new front Derailleur for my wifes walmart bike

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What new front Derailleur for my wifes walmart bike

Old 08-30-13, 05:12 PM
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gamedic
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What new front Derailleur for my wifes walmart bike

My wife has a road bike from Walmart. It is a 21 speed. I need a new front Derailleur for it. It has thumb shifters and is a triple. What would be a good replacement derailleur? $30-$50 dollar range. Does it have to be a 7 speed or will an 8,9 or 10 still work? Thanks.
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Old 08-30-13, 05:27 PM
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Hi,

The rear doesn't matter in terms of the finer points of front derailleurs until
you get to the really expensive stuff. Here you probably want a pretty cheap
triple MTB front derailleur matched to the probably MTB chainring sizes.

Whats wrong with the original front derailleur ?

rgds, sreten.
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Old 08-30-13, 05:35 PM
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Some thing like this one should work for you , https://www.amazon.com/Shimano-Fd-Tz3...ont+derailleur .
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Old 08-30-13, 05:59 PM
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I'm wondering what happened to your old derailer too.

If you really need a new one, and it's a Wally bike, I'd get a Tourney (basic, entry-level Shimano line). You need to be careful, because they come with different specs. Like the one linked above is made for a 42-tooth big ring. But many bikes have a big ring of 48 teeth. Find out the # of teeth on the outermost ring - there's often a number stamped on, but you may or may not be able to see it with the plastic chain guard blocking the way. So count the teeth if need be.

Also be aware of top pull vs. bottom pull styles.

Be careful to get the right part so you don't end up with a weird shifting problem that you can't figure out.

The other thing you can do is contact the bike manufacturer for a replacement part, because they should have stocked it with something that is the right fit. They will give you a new one for free if your old one was dysfunctional, or you can buy a new one from them at about the same cost as a Tourney.
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Old 08-30-13, 06:59 PM
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The shifter would not stay in adjustment. The only chain ring she could use was the small one. I took it to the local bike shop, where the teenage mechanic adjusted on it for thirty minutes and said it was fixed. On the first ride afterward the same thing happened again. I think it is just worn out. It looks to be the cheapest fd Shimano makes. My wife probably put a thousand miles on it over the last two years. The big ring is a 48 tooth and it is a bottom pull.
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Old 08-30-13, 07:08 PM
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If it has an indexed shifter, I would think it's more likely a shifter or cable-related issue than the derailleur. Even cheap FD's don't wear out very quickly.

Then again, if it has a friction shifter, it could also be a shifter-related issue. The spring tension in the derailleur will pull it toward the inner ring if there isn't enough friction to prevent it from doing so.
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Old 08-30-13, 07:26 PM
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Originally Posted by Spld cyclist View Post
If it has an indexed shifter, I would think it's more likely a shifter or cable-related issue than the derailleur. Even cheap FD's don't wear out very quickly.

Then again, if it has a friction shifter, it could also be a shifter-related issue. The spring tension in the derailleur will pull it toward the inner ring if there isn't enough friction to prevent it from doing so.
+1

The FDER just does what the cable pull tells it to do.
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Old 08-31-13, 09:45 AM
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What new front Derailleur for my wifes walmart bike

Ok, what derailleur would work well with her 48 tooth ring? Thanks
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Old 08-31-13, 10:56 AM
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If it was my bike, at this point I would disconnect the cable, making sure to make a note of how it was attached to the anchor bolt. You can use a sharpie to mark the cable where it enters the anchor bolt to ensure it will go back to the same place. Then I would manually move the FD away from the seat tube and let it go back several times and see what happens (with most FD's spring tension will pull it toward the seat tube).

- If there is no spring tension, the FD could be bad.

- If the FD doesn't move smoothly, clean it and lube the pivots. Reattach the cable and see if it works better.

- While the cable is disconnected, click the shifter through its different positions several times to see if it seems right. At the same time, check to see if the cable is moving with the clicks.

- If the FD and shifter both seem ok, then consider whether the cable and housing are worn or not moving smoothly for whatever reason. Consider replacing if there is any sign of a problem. Sometimes the cable seems ok but there still is excessive friction that screws up shifting.

- Go through this FD adjustment guide and make sure everything is installed right and the cable tension is set right: https://www.parktool.com/blog/repair-...ur-adjustments
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Old 08-31-13, 02:50 PM
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Hi,

You need to understand the problem to fix it.
A new part here sounds just wrong. Fix it.

rgds, sreten.
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