Questions tagged [derailleur]

Mechanism to move the chain from one sprocket to another.

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1answer
86 views

Bicycle buying suggestions please! [closed]

As of yet, like most other Indians, I've only ridden a single speed, which was brought for 4000 rupees, about 13 years ago.. Yes, it's still in use! My budget now is strictly 13000 INR for the bicycle ...
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57 views

Chain catching after derailleur change

I am trying to figure out why my chain is catching with each revolution. You can see it in this short video [
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1answer
86 views

Can I use a 3x10 or 2x11 front derailleur on a 3x11 drivetrain?

I recently started changing the drivetrain on my Trail 6 (2020) and I wanted to jump to 3x11 from the 2x9 mixed Altus/Alivio it came as stock. My mistake was not paying attention to the type of pull ...
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1answer
75 views

Can a 9x3 front derailleur fit on a 7x3 configuration?

I own a budget MTB (Decathlon Rockrider ST 100), with 3x7 speed and I want to upgrade the cheap derailleurs to something more reliable (Such as Shimano Deore). I already changed the brakes and ...
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1answer
164 views

Shouldn't use two extreme gears?

I purchased a new Mountain bike a month ago and noticed after a week or so the gears were starting to slip, this was expected because of stretch in cables and wear in etc so I took it in for a tune up ...
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63 views

Bent shimano 12 speed slx m7100 rear derailleur. Cause?

Rear derailleur (mileage: 600 miles) simply bent during my ride (I didn't crash and didn't notice something hitting rear mech). Bend is significant. It seems to me that the derailleur cage is bent, ...
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30 views

Chain length with new derailleur

I bought a 8spd chain and am putting it on a 7spd bikes. I thought I could use either a seven speed or eight speed chain. But it looks like the chain is way too long should I take out some links if ...
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1answer
60 views

Upgrading my bike

I'm very new to the world of bicycles, so apologies in advance. I have a second hand road bike built (by a professional) with spare parts of different components. The rear derailleur is Shimano Acera, ...
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1answer
64 views

Identify a replacement shimano rear derailleur

I have managed to bend the rear derailleur on my gt palomar, the gear was not clicking through so I moved it through the gears set off and heard it crunch. The whole arm is bent. It appears to be a ...
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27 views

Ribble CGR Ti - Replacement Gear Hanger

The gear hanger on my bike broke about 3 weeks ago. This is a sacrificial part, but Ribble are out of stock and seem to have no idea when this critical part will be in stock again. I have looked on ...
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1answer
54 views

Front derailleur wont shift to small gear

I have removed the cable and loosened the range adjustment screws to take them out of the picture. Spring on front derailleur now pushes the cage all way to left. Looks correct so chain should move to ...
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1answer
51 views

Can I change my derailleur without changing my shifter?

I have Shimano V-Brake 8-speed shifters on my bike. These have the brakes and the shifter in one component. I'd like to change my derailleur can I put in a newer 8 speed Shimano derailleur that will ...
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37 views

My shifter shifts only one gear up and down

I just was on a ride and all of a sudden I could only shift one gear up and down (in this case it was the 10th and 11th respectively the 21th and 22th). If I try to move the shifter further up (so up ...
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94 views

Direct mount vs. hanger derailleur

Currently repairing a bike that I got off the road for free years ago. Around three years ago, a stuck link caused a chain jam while pedaling at high speed, causing the metal around the b-knuckle on ...
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2answers
277 views

Can I use Shimano 105 rear derailleur from 11-speed bike with 10-speed Tiagra shifters?

I have a 10-speed 2013 Specialized Allez Elite with Tiagra componentry (and an 11/28 105 cassette) and would like to install my old Shimano 105 rear derailleur in the back to replace the Tiagra one. ...
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70 views

How do I determine the “length” of this derailleur?

What length is this derailleur please. Cannot determine if its a short, medium or long.
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68 views

I need a new bike derailleur, which one?

I have a fairly old Specialized Hardrock Sport. I want to get new derailleurs. Is there a specific one I should get. I'm not sure the one now is the original.
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1answer
96 views

Can I reorient my dérailleur so the top jockey doesn't hit the cassette?

I was running a RD-M7000 dérailleur on my Scott E-Genius 730 and I recently received some good advice here that the Deore RD-M6000 is a drop-in replacement. I have now purchased and fitted that, but ...
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28 views

What type of rear derailer can I use [duplicate]

I bought a used frame without a derailer. What type will I be able to use? I would like to switch to trigger shifters and a good quality derailer. See photos.enter image description here
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3answers
163 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-...
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2answers
145 views

Bottom jockey wheel on rear derailleur keeps skipping chain

Basically the angle between the bottom and top wheels is too great causing the chain to skip to the outside of the bottom wheel under force. If I use the higher adjustment screw on the shimano ...
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1answer
111 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 ...
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1answer
45 views

Rear derailluer broken bolt

I am trying to figure out the right part to replace this bolt that broke. It went through the rear frame of bike into derailleur to a shimano dyna sys II unit. I believe it is a hanger bolt but the ...
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1answer
67 views

Chain pops off guide pulley when pedaling

I re-installed new tires for the first time yesterday. Now I'm having problems with my rear derailleur. The chain keeps popping off the derailleur guide pulley when I pedal forward. I can re-seat it ...
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2answers
84 views

Is my derailleur broken?

This is a Peugeot UO 8 from the 1970s. My problem is recently when moving to the largest gear the chain slips and eventually it will come off the front crank. When researching the problem it seems ...
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1answer
225 views

Sprocket touching the biggest cog no matter B screw…how do I fix?

My Shimano rear derailleur was destroyed, for some reason got into the rear wheel, so I had to buy a new one. Hanger was a little misaligned but I think I fixed it. I bought the new derailleur, ...
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1answer
42 views

Derailleur setting

I have a 7 speed bike. The 5-7 gears don't move the derailleur. It stays at the smallest cog. The derailleur doesn't move until I shift to gear 4. When I get to gear 1, the derailleur is at the 3rd ...
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2answers
720 views

Is it possible to move my rear derailleur so that it does not touch the chain?

My chain is touching part of the rear derailleur. Is it possible to move the derailleur so the chain does not touch it?
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2answers
296 views

Why is low sprocket minimum 28t for a Shimano 105-GS?

I have a Shimano 105 R7000 GS (medium cage) rear derailleur and would like to mount a 12-25 cassette. According to its specs, this should not be possible. I am just wondering: why not? A GS-cage will ...
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1answer
57 views

Broken front derailleur 7400 Dura Ace

The chain came off a couple of times while I was riding yesterday and when I tried to put the chain back, the small screw came off from front derailleur. I think maybe that’s a thing to attach the ...
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1answer
42 views

New bike rear derailleur not working correctly

I got this new bike over a week ago, and I was trying to fix the bike's derailing system and I can't seem to get it fixed. I tried watching a ton of videos online on how to adjust your derailleurs ...
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73 views

Front dérailleur does not shift into largest chainring

I have a Shimano ST-EF60-8R shifter with a Shimano FD3303 front derailleur - it does not go into 3rd gear which is the largest; it feels like the wire is going to pop. I just bought the bike, a Trek ...
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1answer
120 views

Can I fit an MTB freewheel onto my road bike?

I am looking to replace my 7 speed 12-18t freewheel on my old road bike to a different 7 speed (something like 14-28t) for easier hill climbs. Is it possible to do so and what are some possible ...
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64 views

Front and rear derailleur compatible?

I'm struggling and need help! My front derailleur which is 3x9 speed got damaged. Shimano Acera 9-speed, 34.9mm clamp, low-mount, top-swing, dual-pull but I'm thinking to upgrade it with a Shimano ...
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1answer
35 views

Jamis Commuter 4 conversion to derailleur geared

I'm trying to convert my Jamis Commuter bike with an IGH to a 10 speed derailleur setup. I've got a bit stuck on the project with the rear derailleur. Here's what I want to verify. Looking at the ...
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1answer
170 views

Front derailleur cable hits path of pedal

The front derailleur cable is on the path of the pedal. Derailleur cable is in the path of the pedal (right of picture): The amateurish solution of pulling it back with a loop requires a solution ...
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1answer
99 views

Bike derailleur, keeps flicking back when I pedal

I have changed the derailleur on my daughters back, bought like for like. Now fitted. When I try to pedal the derailleur, it flicks backwards and the bike won’t pedal forward, it remains stuck. ...
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1answer
89 views

Seating the rear derailleur cable housing

Unpacked road bike. Assembly is simple enough, except that the rear derailleur cable housing is not in its groove (I'm sure there is a specific term). Here is a picture. No matter how much I tug (...
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76 views

Shimano 9 Speed Cassette with Microshift Advent 9 Speed Road Shifter

I fancy setting up my old but amazing Cannondale F1000 with a dropbar and corresponding road shifters.The only affordable system I could find for that is the Microshift Advent 9 group. I'm happy with ...
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1answer
95 views

Chain crunching after degrease and lubrication

I did the usual degrease and lubrication on my mountain bike today but when I tried to ride the bike later on I heard pretty bad crunching sounds. The sound is definitely coming from somewhere around ...
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3answers
53 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 ...
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2answers
873 views

11-42t cassette with a 9 speed derailleur, will it work?

I'm trying to figure out if my 9 speed derailleur (Shimano Deore) will work with a 11-42t cassette (note that it is a specific 9 speed cassette). It is for a MTB 1× setup I previously had a 3×9 ...
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3answers
137 views

Does the front derailleur limit chain ring size?

Does the front derailleur have limits to which size chain rings can be used? I have a groovy old 1988 Schwinn Prelude and for the most part it does just what I need. However there are some steep ...
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1answer
44 views

First shift up after shifting down only moves as I'm releasing the lever not on both the click in and click out of the lever like the consecutive ones

Video of Issue: https://imgur.com/nY8s4Z0 I have just been given my dad's old bike and was looking at fixing it up. However, it has a shifting problem where it shifts down the gears perfectly fine ...
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2answers
274 views

How does one adjust the equivalent of the barrel adjuster on the XTR RD-M9000 rear derailleur?

I'm used to be able to turn the barrel adjuster on a rear derailleur to be able to bring the derailleur in or out (relative to the wheel). However, it doesn't seem like this particular derailleur ...
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1answer
33 views

Shifter isn't working, cable doesn't react

When I pull the shifter for my front dérailleur the cable doesn't react. Even with tension on the cable. Now I made the cable loose. Also my barrel adjuster is disconnected, maybe the problem is ...
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2answers
73 views

Front derailleur not shifting up

I have a road bike with shimano front derailleur and dropped shifter. For weeks my front derailleur has been very stiff, requiring much force on the shifter to go onto the bigger ring, so the other ...
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1answer
74 views

Shifter labeled low to high

On my bike, on the left shifter, It is labeled low to high and has lots of dots between them. I don't know how to shift to one individual gear on the front derailleur. It seems that If I shift it ...
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1answer
575 views

Adjusting Tiagra Front Derailleur FD-4700

I'm trying to adjust a Shimano FD-4700, brazed-on type installed on a 2019 Giant Fastroad SL-1 I recently changed cranks from Shimano RS400 34-50T to Shimano 4700 34-50T. I took it for a test and the ...
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2answers
126 views

What is this retainer ring?

Shimano RD-9000 which is a bit dinged up due to me setting the bike down...with my feet still clipped in to the pedals What does this ring do, can/should I snap it back in to place, and how? I have ...

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