Mechanism to move the chain from one sprocket to another.

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4
votes
7answers
4k views

What to use to clean a derailleur?

I'm not sure what type of solvent to use to clean a derailleur.
7
votes
1answer
13k views

When to change derailleur pulleys?

A friend said me that if you have one part in a very bad condition like a cassette and then you put a new stuff like a new chain it will destroy the new stuff very quickly. A LBS said that I should ...
2
votes
3answers
14k views

Unable to shift to lower gears; Shimano 6 speed SIS rear deraillers

Presently I'm able to ride my bike only in 5th and 6th gears. I cannot turn the shifter (it's too tight) to move the chain to lower gears. The low stop-screw is all right and it was working till ...
6
votes
3answers
1k views

Single speed conversion chain keeps derailing rear cog under load?

The chain on my SS mt bike keeps coming off the rear cog under load (like when I hit a steep hill) it will hold right after it's tightened but after a few hills it starts coming off non-stop. Talked ...
8
votes
1answer
2k views

Is there a downside to spoke protectors?

A few weeks ago, the derailer on my touring bike caught on the chain and ripped itself off the frame. (See the link below for more info on the incident.) The spoke protector was cracked in half by ...
10
votes
2answers
943 views

How do I locate and loosen the rear derailleur hanger bolt?

Context: I need to remove my rear derailleur so that I can attach an alignment tool and straighten things out. Images of the rear derailleur while the bike is upside-down: ...
6
votes
1answer
798 views

Putting a front Derailleur on a carbon frame

Do you put anything under the clamp on the carbon to protect it? In the past I've tightened brakes on MTB handle bars to much and wrecked them so I'm wondering.
8
votes
3answers
2k views

Why does my rear derailleur keep breaking?

I upgraded my rear-mech with a new cassette, chain and new cables a few weeks ago since then i've mangled two rear mechs! Both times I've just been riding along; not in a big gear; not at the ...
8
votes
4answers
523 views

What can I do to keep my rear derailler in good condition when commuting in the snow?

In the winter, it seems that whatever I do, my rear derailleur stops functioning after few weeks of commuting in light snow. Ice always gets in there somehow, and the chain refuses to move the wheel, ...
7
votes
3answers
15k views

How do I adjust my rear derailleur (Shimano SIS) when it is only slightly out?

It has been a while since I had my bike serviced and the gears are sometimes slightly out of perfect alignment. This results in the occasional mis-shift. I also think the change in seasons have ...
27
votes
7answers
7k views

What's the efficiency of hub gears compared to derailleurs?

What's the efficiency of hub gears compared to derailleurs. I know that hub gears are not as efficient, a part from being heavier, how much will I loose in performance if I use hub gear?
8
votes
3answers
841 views

How tight should my chain be?

I recently put new tires on my bike, and in so doing, removed and replaced the wheels. It seems that now my chain has more slack in it than before, and if I pedal backwards while in the smaller cog ...
28
votes
5answers
7k views

Perfectly setting up gears - how?

Every time I have my bike serviced, the bike shop sets up the gears on a stand in their workshop. The gears change perfectly on the stand, but when the bike is on the road, the rear derailleur doesn't ...
13
votes
4answers
15k views

How do I prevent the rear derailleur from slipping gears?

What's the best way to tune the rear derailleur of my bike to stop slipping gears? It seems that every time I re-adjust it, the middle/upper gears are perfectly aligned, but the lower gears never ...