Questions tagged [derailleur]
Mechanism to move the chain from one sprocket to another.
757
questions
61
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6
answers
111k
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What are the pros and cons of internal gears?
I've had my hybrid 24-speed for a bit over 3 years now, and just last weekend, when looking for a bike for my wife, discovered internal gears. Suffice to say it blew my mind when I saw 7-speed ...
- 817
49
votes
11
answers
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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. Apart from being heavier, how much will I lose in performance if I use hub gears?
- 2,908
38
votes
5
answers
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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 ...
- 481
37
votes
13
answers
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Is there such thing as an automatic transmission for bikes?
Has anyone ever designed or manufactured an automatic transmission (or automatic shifter?) for cycling?
I imagine such a device would automatically change the gearing to allow the rider to maintain ...
- 1,321
27
votes
6
answers
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How to calculate the capacity of a rear derailleur
It's easy to calculate what capacity of a rear derailleur will be needed based on the size of the big and small chainring and the big and small cog. What about the converse question, how to calculate ...
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27
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6
answers
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Why has indexed shifting displaced traditional friction shifting?
I really don't like indexed shifters, at least on the front. They're harder to adjust, more sensitive to cable stretching, and limit the number of gear combinations you can use (because you can't ...
- 1,316
26
votes
11
answers
9k
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Are there real-life alternatives to the chain+derailleur combo?
I was reading an article about the CeramicSpeed’s Driven concept and, while not interested in the efficiency part, the chainless system reminded me of something I was wondering for some time: are ...
- 1,135
19
votes
3
answers
13k
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Is it normal for my derailleur cables to cross over on the down tube?
I've just picked myself up a Specialized Allez Sport 2014 road bike from Evans Cycles (UK).
I test rode the bike and I'm happy with the bike, but when I got home, and flipped the bike over to make a ...
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19
votes
1
answer
2k
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Relative efficiency of different commute bike setups
My interest is in long distance commuting (e.g. more than 50 km a day) and the relative efficiencies of different commute bike setups (e.g. drop bars vs flat bars, fenders vs no fenders, panniers vs ...
- 30.7k
18
votes
2
answers
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Chain slipping off derailleur jockey
Last week, I had to abandon a training ride due to my chain slipping off my rear derailleur jockey wheel. This would only happen when shifting, and most often when either shifting chainrings or ...
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18
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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 ...
user652
16
votes
4
answers
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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 ...
- 2,075
15
votes
10
answers
4k
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Beginner breaks rear derailleur, what might have gone wrong?
I broke the rear derailleur on a borrowed bike. I'm trying to understand why.
Until two months ago I knew nothing about bicycles. I bought a worn down cheap second hand bike. It took me way more time ...
15
votes
8
answers
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If a derailleur cable snaps on a long ride, how can I keep going?
A couple weeks ago I rode around Crater Lake, a 35 mile ride with over 4500 feet of cumulative elevation gain – the sort of ride you really want functional gears for.
The night before my rear ...
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15
votes
4
answers
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What options do I have if my rear derailleur breaks when I'm out on a trail?
I ran into an unfortunate situation earlier this week. I was out on a mountain bike trail, alone — just me and my hardtail. I'm pedaling, when I suddenly hear a CRUNCH and my bike stops. The hanger ...
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