Questions tagged [derailleur-rear]

Questions referring to the derailluer responsible for moving the chain along the cassette

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12
votes
3answers
61k views

How can you identify if a Shimano rear derailleur is medium or long cage?

I have a 2013 Shimano XT rear derailleur. It is part of a 2x10 drivetrain. How can I find out if it is a medium or a long cage one? The picture below shows the derailleur.
3
votes
5answers
51k views

9-speed system to 11-speed drivetrain upgrade?

I am currently upgrading my bike from a 9 speed to an 11 speed system. I am currently using shimano 105 components and will continue to use them within the new system. Current bike has a shimano 105 ...
12
votes
3answers
5k views

Why is cross chaining 'bad', but 1x is OK?

When you run 1x, aren't you basically force to cross chain?
13
votes
2answers
1k views

Bike chain slips in a strange way

I bought a new bike about a month ago. And it made a strange sound from the first ride , I thought the sound was because it was new and will disappear with time but it didn't. The sound is like a ...
9
votes
3answers
5k views

Is my derailleur hanger too bent?

I bent the (steel) derailleur hanger on my 9spd cassetted (steel) Bianchi Volpe about 1.5 yrs ago, and I just did it again, but worse. This time the derailleur got sucked into the wheel and really did ...
7
votes
7answers
1k views

why would my chain slip on the road, but not when the bike is on a stand?

The chain on my bike has started to slip a lot -- every couple of seconds when riding. It happens, as far as I can tell, in every gear, and is unrelated to shifting. The precise nature of the problem ...
6
votes
6answers
4k views

Should I adjust rear derailleur as my chain seems too close to each other

I am learning to replace chain and freewheel (So far so good). After I put new freewheel and new chain on, the chain are too close to each other at the back now (as you can see in the photo). I think ...
4
votes
2answers
17k views

Can I just fit a cassette with more gears with the same derailleur?

I've got a Boardman Road Sport which I use for commuting and doing reasonable length rides during the week etc. I have Shimano Claris as my rear derailleur and so is some of my groupset. I would like ...
3
votes
1answer
9k views

How to find the cage length of a rear derailleur?

I need to replace my rear derailleur. I've been looking at a few ones on eBay, however, my issue is that the seller does not know the size of the "cage". Specifically, I have a Shimano Tiagra RD-4400 ...
2
votes
1answer
2k views

My Shimano Tourney RD-TY22 7–21 speed bike rear derailleur mech, direct attach has broken, need a replacement, preferably newer

To cut a long story short, I have a full suspension mountain bike. Its rear derailleur mech (see title) is broken, had a trip round the spokes and age has degraded the main springs. I therefore need ...
0
votes
3answers
1k views

gears overshifting issue

As I have explained in my previous post here I have changed my rear shifter cable and housing. But I'm still having issues with shifting gears smoothly. It overshifts at particular gear combinations ...
7
votes
2answers
2k views

What could have caused a rear derailleur to end up in the back wheel suddenly?

This is a similar question to What exactly happened to my rear derailleur? but with some significant differences. My bike had recently been serviced (about 3 weeks/500 km previously). All that had ...
13
votes
5answers
7k views

Why doesn't Shimano use shadow technology on road derailleurs?

Shimano has been using their 'Shadow' technology on their high-end mountain bike rear derailleurs (> Deore) for many years. In addition to the benefit described in the images below (from here), ...
13
votes
1answer
28k views

Which pulley is which on my Shimano STX RC derailleur?

I disassembled my rear derailleur to clean it; when I removed the sprockets they basically looked the same; both jet black and caked with all sorts of black grease-like-stuff. I figured they were the ...
5
votes
1answer
21k views

Misadjusted B-screw: symptoms?

What are the typical symptoms of incorrectly adjusted B-screw in the rear derailleur? How does it manifest itself when shifting? Obviously, if the cage pulley interferes with the cog, the problem is ...
2
votes
2answers
14k views

Bike pedals turning when coasting (not a fixed gear)

My pedals are moving when I'm coasting, and if I try to stop them the upper segment of the chain gets really loose, and the rear derailleur does this thing, where it gets almost horizontal, and then ...
1
vote
2answers
3k views

Is this regular chain/pulley noise or is there someting I should check/adjust?

Extra images I'm 99% certain the noise is coming off one or both of the derailleur pulleys, but not sure if it's to be expected or if it's irregular and something that should be fixed? Edit Just ...
7
votes
4answers
23k views

Can the Tensioner Spring go Bad on a Rear Derailleur?

My bike chain has been "skipping", so I've gone through the obvious: I replaced the chain I replaced the smallest cassette cog, which was showing significant wear After my replacements I noticed ...
7
votes
5answers
3k views

Pedals spin freely in cold conditions

I recently bought a second hand Giant Upland SE and to be frank, it is my first bike with multiple gears. The bike functioned normally for the first day or two. I could use all the gears. When the ...
5
votes
3answers
4k views

Can't find the B-tension screw in rear derailleur

I am trying to register my old rear derailleur (a 15-year-old Shimano "7sis"), and I'm trying to find what every guide calls the "B-tension screw". I looked everywhere and couldn't ...
5
votes
1answer
3k views

Should I lubricate rear derailleur wheels

Replacing the chain I found that the plastic wheels of the rear derailleur are rotating with high resistance. So I disassembled the wheel, cleaned it from dirt and sprayed with WD-40. Here is how it ...
4
votes
3answers
10k views

Threading Shimano chain, over or under lug?

I have an MTB with Shimano Deore/SLX components. I just replaced the chain. Should the chain go over the lug as I have it in the picture?
4
votes
2answers
982 views

DX derailleur 1990 maximum teeth?

I'm trying to upgrade my cassette on a (commuter road bike) bike that uses a Shimano rear DX derailleur from ca 1990. What would the maximum tooth count be for this RD? The model says rd-m650 but I'm ...
4
votes
1answer
541 views

XT derailleur 1995 maximum teeth?

I'm trying to upgrade my cassette for lower gearing on a Nishiki Continental. The previous owner put on a (NOS) Shimano XT rear derailleur. I use friction shifters. I looked on the back of the cage ...
4
votes
12answers
30k views

Fitting a 9-speed 11-50T cassette on MTB: which derailleur?

I'm trying to understand if its possible to fit a 9-speed 11-50T cassette (found one on Ali) on my MTB. The plan is to go 1×9. The problem is that I can't seem to understand the if a specific ...
4
votes
3answers
4k views

Bearings vs. bushings in rear derailleur jockey wheels - which should be more resistant to contamination?

This question came up in a forum I frequent. As background, many of us are familiar with ball bearings, as they are used in many places on bikes: the bottom bracket, the hubs, the headset, etc. Not ...
4
votes
1answer
4k views

Choose medium or long cage?

I am upgrading (or downgrading ? :P) my MTB to 1x, currently on compact 2x10. I will be changing chainring, derailleur and cassette. I will get 11-42 Sunrace MS3 10-Speed Cassette. Also Shimano XT ...
3
votes
3answers
451 views

Is my Shimano Deore SLX dérailleur a medium or long cage?

I have a Scott E-Genius 730 Plus and would like to replace the rear dérailleur (the probable cause of difficulties described in my last question). It's a Shimano Deore SLX Dyna-sys unit, it's for a 10-...
3
votes
1answer
2k views

Why the adjustable spring tension on the cage of Shimano rear derailleurs?

Why do some Shimano rear derailleurs have an adjustable cage spring tension and what is affected by increasing it (default is low tension)?
3
votes
3answers
989 views

Can I put a lower geared cassette on my bike?

I bought a bike recently that has a 34 front 28 rear gear ratio. It is an Elfama E2500, which is a Korean brand I believe. It has a Shimano Claris (which is rated for up to 32 teeth) rear derailleur ...
3
votes
3answers
19k views

How to increase tension of rear derailleur cable

I have a Trek Shift 3 (I bought/got new/unused in May 2016) with a Shimano ST-EF65 Shifting Lever (Index) and I am unable to shift gears in the rear derailleur. I think the reason I can't shift gears ...
3
votes
3answers
6k views

Noisy rear derailleur (Shimano RD-5800)

From the moment of buying the bike from a friend of mine, I have noticed that the rear derailleur was a little bit noisy. I thought that it would be problem solved by cleaning and greasing the jockey ...
3
votes
1answer
711 views

Chain overshoots cog when shifting from low to high gears

Hi when shifting from low to high gears my chain is overshooting the cog and jumping into the next one. I tried turning the low limit screw outward to move the derailer in towards the low gears but it ...
2
votes
2answers
153 views

Weird whistling from the rear derailleur

Shimano Deore xt, 10sp. The noise happens only when I change gears for the short period of time when the chain is moving from one sprocket to another. While pedaling on one gear it works well and ...
2
votes
1answer
175 views

Can I Upgrade shimono Ultegra 9 speed 12-27 cassette

I have a 2009 Trek 7.7 FX with Ultegra 12-27T cassette, 50/39/30 Front triple. I want to upgrade the rear cassette to give better hill climbing gears. Can I fit an 11-34 Rear cassette and if so what ...
2
votes
2answers
4k views

9 speed cassette to put 42 teeth

I like to start cycling again but I have a steep hill to arrive at home so I would like to put a 42 teeth. I have an Ideal mountain bike model hillmaster with a 9 speed cassette. All videos on you ...
2
votes
0answers
1k views

New chain 'jumps' on sprocket [duplicate]

Campagnolo Triple T rear derailleur 9 Speed Campagnolo Athena 3x11 speed crank and front derailleur Chain KMC X11 with missing link. http://www.kmcchain.eu/chain-KMC_X11–93-road_cross-11_speed The ...
1
vote
3answers
99 views

My bike shifting won’t surpass 6

I own a Scott Aspect 740. On the shifter it says it is on gear 7, 8 or 9 however in reality on the rear derailleur the chain is only on 6 and won’t go past this. I’m looking for a fix as it is very ...
1
vote
1answer
648 views

Rear derailleur breakages [duplicate]

This is hypothetical in the spirit of a recent question about derailleur cables, but I've seen two bikes being pushed with broken rear derailleurs in the last few days. What are likely causes of ...
1
vote
2answers
2k views

Can't Find My Derailleur Hanger

My Derailleur Hanger broke and I want to replace it. However, I couldn't find any information about my bike or model or what kind of hanger I need to buy. The brand is Esperia and model name is Aria. ...
1
vote
1answer
131 views

Servicing/tensioning a rear mech

I have a Tiagra 4600 10 speed rear mech (mid length) which is sluggish to shift into higher gears. Shifting was all over the place, I’ve replaced the jockey wheels and checked the hanger alignment. ...
1
vote
2answers
3k views

Can we use a 9 speed rear derailleur on a 8 speed bike?

I have a Rockrider 5.2 with a Shimano Altus 8 speed rear derailleur. After an accident it started to malfunction. I planned on replacing it with a Shimano Acera M3000 but then it is marketed as 9 ...
0
votes
1answer
2k views

Campagnolo Ergopower inaccurate shifting on high and low cogs

I replaced the G-Spring and G-Spring carrier on my 9 speed Chorus Ergopower. Now it is shifting better and the clicks are sharper, but I can't adjust the derailleur to shift good on all gears good. ...
0
votes
1answer
853 views

What exactly happened to my rear derailleur?

I had installed my front derailleur and was adjusting the high/low when I noticed my rear derailleur was hitting the spokes of my wheel. Suddenly, I saw a screw pop out and then my derailleur popped ...
0
votes
2answers
171 views

Why does my Shimano Deore SLX dérailleur not rotate into the expected (vertical) position?

I have a Scott E-Genius 730 Plus mountain bike (around three years old). I had a chain snap recently, so I have replaced the rear 10-speed cassette, and am now trying to route a new chain correctly. I ...