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Swapping out my front and rear derailleurs

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Swapping out my front and rear derailleurs

Old 10-06-17, 03:03 AM
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Swapping out my front and rear derailleurs

I have been having trouble adjusting my gears correctly (so that they stop making noise and grinding in one spot or another) Every time I set the high, the low goes and then fiddling with the cable length blows everything out. I have a 2014 Giant "Boulder 2" which came with a TOURNEY TX55 rear derailleur and a TOURNEY TX51 front derailleur. I purchased another rear derailleur (TOURNEY TX35) (thinking this might solve the problem) and a new front derailleur (SORA 3500-B x2) but I'm now just stuck with questions. - Will the SORA fit as my front derailleur (in place of the original TOURNEY FD)..? - Will the SORA be a better option than the original TOURNEY FD..? - Is it worth changing over to the other NEW TOURNEY TX RD (as I don't think there is anything wrong with the original)..? - I would like to upgrade both derailleurs, but what should I buy and what would be the next level up..?
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Old 10-06-17, 03:13 AM
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Curious as why you would purchase a front derailleur for a double when that Giant model specs show it has a triple.
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Old 10-06-17, 04:15 AM
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SORA is for Road Bikes, it will Not be Compatible with the hybrid/MTB flat shifters you currently have. Do Not buy the SORA

anything Tourney is lowest end components.
if you want to upgrade, the order is: Tourney, Altus, Acera, Alivio, Deore, Deore XT, Deore XTR
This list does not include Road Bike groups, since they aren't compatible with your shifters.
anything Tourney will all feel the same, go up or don't bother.
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Old 10-06-17, 05:47 AM
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The problems you describe are more likely traced to cable/housing problems than to the derailleurs. Setting limits and cable "tension" will do no good if the cable binds too much to move smoothly under spring tension from the derailleur. Attend to that first, making sure the cables run freely. Next you need to be sure the front derailleur is mounted correctly and that the rear hanger is not twisted/bent. If you don't attend to those then changing derailleurs will not solve your problems.

Also, it would be helpful to know when/how the problems you are having arose. Presumably you have not had them since 2014. Did they come on gradually (which would imply cable problems) or suddenly (which would likely be connected to something like an accident, a change you made in the bike, or a maintenance procedure done incorrectly?

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Old 10-06-17, 02:53 PM
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Originally Posted by DAS89
I have been having trouble adjusting my gears correctly (so that they stop making noise and grinding in one spot or another) Every time I set the high, the low goes and then fiddling with the cable length blows everything out...
The high and low adjustments are limit screws that just restrict the upper and lower range of derailleur travel. They do not affect one another.

Originally Posted by DAS89
I have a 2014 Giant "Boulder 2" which came with a TOURNEY TX55 rear derailleur and a TOURNEY TX51 front derailleur. I purchased another rear derailleur (TOURNEY TX35) (thinking this might solve the problem) and a new front derailleur (SORA 3500-B x2) but I'm now just stuck with questions...
There shouldn't be any reason to replace your derailleurs.

The TX35 and TX55 rears should behave exactly the same. No need to replace one for the other unless your original one is damaged (bent or worn out), which is fairly unlikely. Most damage that would warrant replacement would be visually obvious.

A Sora front derailleur is not a suitable replacement for the Tourney TX51, for multiple reasons. The Sora derailleur is a road bike part and uses a different cable pull than Shimano mountain bike front derailleurs. The Sora derailleur is designed for a double crankset and won't shift your triple properly. The Sora derailleur is designed for different chainring sizes than the 28/38/48 rings on a 2014 Giant Boulder 2. Most road derailleurs are 'bottom pull' units, meaning the cable routes around the bottom bracket and up to the derailleur, while your Boulder 2 needs a 'top pull' or 'dual pull' derailleur. And finally, the clamp size on the Sora derailleur may not be the right diameter for your frame's seat tube (assuming you didn't check).

BOTTOM LINE: There's almost certainly no functional reason to replace your derailleurs. Have them adjusted by a shop, or adjust them yourself using a good set of instructions like the ones on the Park Tool web site (linked below). Follow the instructions exactly, step by step.

https://www.parktool.com/blog/repair...eur-adjustment
https://www.parktool.com/blog/repair...eur-adjustment
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