Adjust Mountain Bike Derailleur
do I need to replace the front derailleur?
My friend has just bought a second hand mountain bike, When I try to change up into the largest chain wheel ( there are 3 ) the chain jams in the front derailleur. I have tried adjusting the front derailleur to allow the chain to be moved further over towards the larger chain wheel but it still jams. I suspect the front derailleur is slightly bent or the larger chain wheel bent. The bike is more of a budget bike and the front derailleur dose seem to be made of fairly soft pressed steel (buscuit tin metal LOL). However it dose change well between the first 2 gears.
Would I have to open the chain to fit a new front derailleur?
Also Im guessing the correct way to possion the front derailleur is to have the chain centered in it then tighten it to the frame.
Many thanks in advance
The derailleur may be positioned too low on the frame. Move it up if it appears to need more clearance it should have a couple mm clearance from the tips of the big ring’s teeth. You need to release the cable from the derailleur to do this.
It’s easy to see if the large chain ring is bent. Spin the pedals backward and look at it. A very little wobble is OK.
You don’t break the chain for a new derailleur replacement. At the bottom tip of the derailleur cage is a screw that holds it together. Take the derailleur off the bike so you can get to it.
Generally, to position a ft. derailleur, put the chain on the middle chain ring and closest to the middle cog on the back. It should line up with the chain in this middle position. Finally, position it so it clears the big ring like stated above. You may have to tweak it a little but it should be right on if you do this.
How to Adjust a Front Derailleur – Mountain Bike (www.fezzari.com)
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