Tagged Questions

Mechanism to move the chain from one sprocket to another.

learn more… | top users | synonyms (2)

1
vote
1answer
657 views

rear Derailleurs of 7 speeds for road bike?

Hello everyone I recently broke my Derallieur in my Road bike and I am planing to get a new one online but I dont know exactly wich one to get is for the rear Derailleurs of 7 speeds. thanks
3
votes
1answer
810 views

Converting a short cage derailleur to a long cage derailleur

Is it possible to convert a short cage derailleur (for example the huret svelto) to a long cage derailleur by just taking the lower cage and replacing it by a longer one?
3
votes
1answer
376 views

Short cage derailleur: how to find out maximum sprocket differences?

I'm building a kind of new bike and would like to put a triple or compact crankset on it. I've still got this NOS huret derailleur set (front, rear and shifters) laying around which would match the ...
2
votes
1answer
3k views

Which derailleur should I use with a Shimano 7 speed freewheel 14-34T megarange?

Which derailleur should I use with a Shimano 7 speed freewheel 14-34T megarange in order to prevent the derailleur from rubbing the cassette in 2nd.
6
votes
3answers
2k views

Why does my bike stick in low gears?

When I change into a low gear (i.e. onto a bigger cog) on my back cog all is fine. However, when I later change up again the chain sticks on the larger cog. I commute about 10 miles a day and this has ...
2
votes
1answer
386 views

Biopace chain rings and front deraileur rub

Turns out my front chain rings are biopace, after I thought they had disappeared! I've got a problem with the chain rubbing the front deraileur at a certain point every rotation. I only get this in ...
4
votes
2answers
2k views

Is it practical to replace two sprockets on a cassette?

My bike has 53/39T chainrings and a cassette with 12,13,14,15,17,19,21,23,25 sprockets, but I like to ride up steep mountain roads. Is it possible (without great expense) to replace two sprockets to ...
6
votes
4answers
23k views

Can a rear derailleur be used for either a 9 speed cassette or 10 speed cassette?

I currently have a 9 speed 11-25T cassette on my road bike. I'm thinking about switching to a different cassette with more teeth on the climbing gear. The cassette I'm currently look at is a Shimano ...
8
votes
1answer
6k views

Chain slipping off derailleur jockey (need suggestions ASAP)

Last week, I had to abandon a training ride due to my chain slipping off my rear derailleur jockey. This would only happen when shifting, and most often when either shifting chainrings or shifting ...
2
votes
1answer
418 views

What crankset should I buy to suit an 8 Speed Campy freehub?

I've just bought a pair of campagnolo/mavic wheels without a freewheel. I'm finding it very hard to understand what will fit on the rear hub. It's English thread, does this mean that any 8 speed ...
2
votes
3answers
2k views

Front derailleur doesn't seem to be moving

I'm trying to troubleshoot my 24 speed hybrid bike. As it was, the front shifter was having very little effect. I would change gears and not much would happen. When I had a chance to look at it, I ...
0
votes
3answers
1k views

Getting a dura ace 7800 derailleur to work with 10 speeds

I have a bike set up with a dura ace 7800 derailleur, specifically listed as a 9 or 10 speed model. I am interested in getting it working in the 10-speed configuration. Two things: I remember ...
4
votes
3answers
2k views

Why is there a distinction between friction and indexed derailleurs?

I've seen people make a distinction between a derailleur being for friction or indexed. Is this distinction somehow functional? I can't see how it could be, because every derailleur I've ever seen ...
3
votes
3answers
1k views

What causes my chain to derail at the rear when I accelerate?

I recently bought a beat-up old mountain bike for commuting. I've tried to clean and adjust the derailleurs and everything seems to work well enough in my garage. But when I put heavy weight on the ...
1
vote
3answers
3k views

Is there any functional point of using alloy jockey wheels?

Jockey wheels seem like the most pointless thing to upgrade on a bike. I can see swapping out the usual grey ceramic jockey wheels for an anodized alloy one to match the look of the rest of the bike, ...
1
vote
4answers
703 views

is it worth to change slx 2011 rear derailleur for xtr 2009?

I bought a bicycle last summer a Specialized camber comp and it mounts Shimano SLX as rear derailleur. My intention is to change it for a xtr derailleur (from 2009) which is mounted in a bicycle I ...
4
votes
1answer
566 views

Is my front derailleur angled straight?

I am attempting to adjust my front gears and have also been following a video to adjust the high/low position of my front derailleur. The issue I am having is that the low adjustment is no where near ...
5
votes
2answers
34k views

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 ...
3
votes
3answers
283 views

Gear shift adjustments

I recently had to replace the shifters on my bike. The replacement was easy enough, but now when I shift the derailleur either jumps too far or too short. I've tried using the adjustment screws on the ...
3
votes
2answers
1k views

campagnolo wheel on shimano or sram drivetrain?

I have a road wheel that has Campagnolo splined hub and 10 speed cassette. I'd like to know if anyone has any experience running a Campy wheel on Shimano/Sram drive train? I know the measurements of ...
3
votes
2answers
5k views

Road Shifters, Mountain Rear Derailleur?

I have a road/cyclocross/commuter frame that is currently spec'd with road components - all Shimano 105, with an Ultegra rear derailleur. The cassette (10 spd) tops out at 27 teeth, and the rear ...
4
votes
2answers
476 views

Practical benefits of expensive jockey wheels?

Today I had to make a detour to the bike shop as a jockey wheel decided to fly out of a friend's derailleur. The shop were able to supply a replacement retaining bolt free of charge, however the only ...
5
votes
2answers
1k views

is this derailleur short cage or long cage?

I'm selling the rear derailleur off this bike, and someone asked whether it's short or long cage. I assume it's long. Is this correct?
1
vote
2answers
945 views

Is it possible to reverse cable direction in Shimano M770 shifter?

I tried to set up the perfect shifter + derailleur. For the last part it is better (for me) to have low-normal version, because reducing gears is essential for me (I bike mostly within city). So I ...
1
vote
1answer
503 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 ...
3
votes
2answers
9k views

How do I select a rear deraileur for my mountain bike?

I have damaged my rear derailer and are looking for a replacement, aside from replacing it with the exact same model, what do I look for in terms of compatibility. I note that there are long medium ...
2
votes
3answers
4k views

Determining front & rear derailleur compatibility

I have a 2009 Kona Dew and I'm just wondering how to figure out what front and rear derailleurs are compatible with my bike. Do I just have to find a matching Shimano part that fits 8-speed gearsets? ...
1
vote
2answers
836 views

Installation of the simplex SX410

The Simplex SX410 rear derailleur on my bike was dirty, so I got it off to clean it. Yet, now I can't quite seem to get it on again in a correct way. Specifically, I can't get the spring to be ...
11
votes
4answers
5k views

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 ...
2
votes
2answers
315 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 ...
5
votes
6answers
19k views

Problem with chain skipping without trying to shift (even with new chain and gears)

I have a mountain bike where the chain intermittently skips when put under load on the middle (and very rarely on the smallest) chain ring. It is not related to shifting. I've taken several steps to ...
7
votes
3answers
9k 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 ...
1
vote
4answers
4k views

How do I know which derailleur I need?

The derailleur on my sons mountain bike is mangled, how do I know what to replace it with? I understand they aren't one size fits all. There are 6 sprockets on the rear cassette and 3 on the front.
6
votes
4answers
7k views

Bike is shifting on its own

Ever since I got my bike (Surly Long Haul Trucker), it has been prone to shifting on its own. This is almost guaranteed to happen when I stand up on the pedals, and happens regularly when sitting as ...
23
votes
4answers
29k views

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 ...
2
votes
6answers
6k 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. ...
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
904 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
757 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
488 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, ...
6
votes
2answers
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 ...
26
votes
7answers
6k 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
825 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
6k 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
14k 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 ...