Mechanism to move the chain from one sprocket to another.

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4
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7answers
3k views

What to use to clean a derailleur?

I'm not sure what type of solvent to use to clean a derailleur.
1
vote
1answer
393 views

ideal dérailleur height for a Deore on a Biopace?

Reading on every site about front dérailleur adjustment, the distance from the bottom of the outer dérailleur plate to the bigger crank cog should be "one penny". Mine is around 1cm! it does shift ...
2
votes
6answers
5k views

Adjusting rear derailleur - shifts to lower gear, but not to higher

Well, it will shift to a higher gear, but it takes two clicks of the shifter and it skips over a gear when it does shift. With one click the chain hangs on the current gear by the slimmest if threads. ...
2
votes
2answers
304 views

Has bicycle gearing become 'easier' over the last few decades?

If you look at a 10-12 speed bicycle from the days before indexed gears you have a 27"/700c wheel with a 42/52 chainset and a 14-28 freewheel. At the time such a setup was standard for High Street ...
6
votes
3answers
7k views

Is my chain too long?

I'm in the process of setting up a new drive train. When using the smaller chainring and smallest sprocket (hence least amount of utilized chain), the chain brushes up against the bottom of the ...
6
votes
1answer
10k 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
10k 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
763 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: ...
8
votes
4answers
450 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, ...
13
votes
4answers
12k 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 ...
6
votes
1answer
643 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.
6
votes
2answers
12k 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 ...
8
votes
3answers
777 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 ...