Questions tagged [derailleur-rear]

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

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2answers
49 views

Campagnolo Super Record H Screw

I am having trouble adjusting the shifting on my Campagnolo Super Record rear derailleur. I have set the high and low limit. I think the main problem now is that the jockey wheels are too far away ...
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2answers
71 views

Chain touches plate between pulleys

I've replaced chain and dropout hanger. The rear derailleur is Shimano Claris. When I'm turning pedals chain (Shimano hg-71) is touching small plate (marked with red arrow) between high (closer to ...
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1answer
39 views

Sram Eagle NX Rear Derailleur not reacting to cable tension

Have had a SRAM NX Eagle rear derailleur (bike is a 1x) on my YT Jeffsy for about a year and a half. For about the first year, worked awesome, indexed the gears a few times and all was good. Last half ...
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1answer
81 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
188 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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42 views

How do I figure out what the model number is of my Shimano rear derailleur?

Here are pictures of my current derailleur I need to replace.
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2answers
161 views

I think I have installed my new rear deraileur incorrectly, can anyone give me some advice

I have replaced the derailleur on my daughters Dawes Academy 26, but I think it looks wrong. On the lowest cog (gear 8) the derailleur looks like this: enter image description here: I assumed that ...
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1answer
67 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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1answer
85 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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1answer
59 views

Upper pulley too far from cassette

I'm doing a 1x conversion with a Shimano SLX (M7000) groupset on an old road frame. I just installed the rear derailleur and the pulley is too far away from the cassette. 18mm from the max cog (...
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1answer
44 views

Replace a Sachs Echo s with modern derailleur

enter image description herelooking for a replace of a Sachs Hurret Echo S with a modern derailleur for use on a 14 28 free wheel. Suggestions have been the Shimano Altus or Shimano Tourney neither ...
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3answers
189 views

Friction shifting 9 speeds using an 11 speed rear derailleur

I am interested in running a 1 x 9 drivetrain using an 11-speed Shimano 105 R7000 rear derailleur. If I'm friction shifting 9 speeds, will using an 11-speed derailleur cause issues? Or is it as simple ...
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76 views

Have I bought the wrong rear derailleur?

I cycled through a plastic bag and it bust my rear derailleur apart. Photo attached. My bike is a Raleigh Equipe road bike, which looks like this: https://www.ecosia.org/images?q=raleigh+equipe+road+...
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3answers
112 views

Why can't my rear shifter shift into low gears?

I have an entry-level Trek mountain bike bought several years ago, with a Shimano derailleur. It's been hanging in my garage for the last few years, taken down only a few times for rides. I just did a ...
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3answers
141 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
102 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
107 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
49 views

1x GRX chain sizing with 42T cassette

I'm trying to convert a bike to a Shimano GRX 1x setup using the following components: RD-RX812, CS-M8000 (11-42T), CN-HG701-11 (and FC-RX810-1, 42T). The problem I'm stuck at is when shifted to the ...
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1answer
60 views

Do I need a medium or large cage rear derailleur?

My SRAM x5 rear derailleur got caught on something and broke. I went to order a new one and learned there are different cage sizes. I don't know which size cage I currently have. While trying to ...
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1answer
29 views

Replacing a B-knuckle tension spring

I have a [cheap and old] Falcon Indexing System (rear derailleur). There seems to be not enough tension on the B-knuckle pivot point so the cage runs into the large cogs. There is no B-knuckle ...
3
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1answer
66 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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1answer
69 views

Derailleur does not match up with chain after tube replacement

I have been recently replacing rear inner tube on my bike, since then I was not able to fix the wheel back in. It makes unusual clicking sounds when backpedaling and one side of the chain gets loose....
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1answer
42 views

Derailleur compatibility with Shimano 5500 shifters

Working on an old bike with a hodgepodge of groupset components - 5500 "105 flight deck" shifters (apparently 9 speed from what I've been able to work out online), a 3x Sora crankset, and a 9 speed ...
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1answer
215 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
49 views

My 6 geared Shimano bike doesn't shift from higher to lower gears but does the opposite smoothly

My 6 geared(Shimano gears) mountain bike with the grip shifting system shifts really smoothly from the 1st gear to the 6th (biggest cog to the smallest). However when I try to twist the shifter from ...
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2answers
716 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
53 views

Upgrade Peugeot 5-speed to indexed flat bar shifters

My girlfriend got a vintage Peugeot with original 5-speed cassette (2 front gears) and friction stem-shifters (with a flat bar). She's struggling with the shifting. I'm considering the following ...
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3answers
85 views

Could a slightly bent rear mech cable be the cause of poor shifting?

I have trouble indexing my SRAM Apex 1x drivetrain. If I get it to shift correctly at one end of the cassette, it doesn't shift so well at the other end. Sometimes I have to click multiple times at ...
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0answers
59 views

Pulley alignment of Shimano derailleur

I noticed a misalignment between the two pulleys on a brand new Ultegra R8000 derailleur. It's less convincing on the photo than in real life, but still very much visible. I came across this ...
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2answers
194 views

What can I use to replace a Shimano Deore LX RD-M581?

I've got a trusty Marin East Peak XC from 2008, but the rear derailleur's adjustment screws have all sheared and I need to replace it. The derailleur is a Shimano Deore LX RD-M581, but I can't find ...
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1answer
73 views

Are rear derailleur cable intervals equal?

On one occasion in the past I paid attention to get the rear derailleur to be "just right". On eight gears on an MTB, I would get gears 1-2-3 and 5-6-7-8 to be perfect (minus the chain rub on one end ...
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3answers
699 views

Recovery from a cycling mishap

I took my bike for the first ride of the season yesterday and unfortunately it was pretty short. As I was cycling through the rear gears I hear a plinking sound and then a large clunk. I stopped ...
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1answer
48 views

Adjust a Shimano 105 9x rear derailleur

Please help me (re-)adjust my .Shimano 105 9x rear derailleur of my ancient Shimano 105 3x9 gruppo. It's a RD-5501, as my research seems to support. The prequel: After working fine for many ...
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3answers
250 views

Squeaky noise coming from rear derailleur or jockey wheels

I have this horrible squeaky noise coming from my rear deraileur area. It only happens when I pedal. Watch below for the video.
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1answer
63 views

Very short-pull derailleurs designed specifically for 1x6 drivetrains?

EDIT: After some searching, it appears this type of derailleur is currently available in the form of folding bike derailleurs, such as the Shimano RD-FT35. It is a SIS 6/7 speed compact derailleur ...
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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
93 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
84 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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2answers
36 views

What derailleur hanger do I need for my Merida Speeder 200?

My rear derailleur hanger on my Merida Speeder 200 (2019) is slightly bent, resulting in bad shifting across the whole range. While I found an explanation on how to bend the hanger back I want to buy ...
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1answer
92 views

Changing Shimano Tiagra 12-28 cassette to 11-32

I currently have a Merida Scultura 300 which comes fitted with Shimano Tiagra 50-34 crankset and 12-28 cassette. I'm struggling up some big hills in my area and want to change to a 11-32 Tiagra ...
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1answer
62 views

Flat bar conversion - shifter is skipping a gear

I am in the middle of converting my bike with road handlebar to a flat bar. The old road bar has a Shimano 105 brake/shifter and 105 derailleur. Something like this: https://www.mec.ca/en/product/5055-...
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0answers
38 views

Campagnolo rear mech screw type

My limit screws' heads have gone rusty, I want to replace them for looks and to make sure they are easy to adjust on a ride. I would love hex rather than Philips heads! Does anyone know the type of ...
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3answers
52 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
103 views

Shimano Sora 3400 shifters with Shimano Alivio M430 rear derailleur?

I'm thinking about a touring built with just spare parts I have. I have a rear Alivio M430 9 speed derailleur and Alivio 9 speed 11-34t cassette already. I want to have drops and Sora 3400 is the ...
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3answers
375 views

Rear derailleur bent (not derailleur hanger)

Got a (heavy) plastic bag stuck in my rear derailleur of my <1 year old Salsa Journeyman Apex 1, the bag fully wrapped into the derailleur wheels while I was biking at about 10-15 mph. I had to ...
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2answers
57 views

Rear derailleur does not downshift properly, shifts up smoothly

I can't get my rear derailleur to downshift properly. Especially in the middle of the cassette it'll delay a bit before shifting. Limits are set correctly. Since I can't explain this properly I ...
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2answers
2k views

Vintage bike, new chain

I've refurbished a vintage bike and I switched the old derailleur with a new medium cage tourney derailleur, the chain is also new and is 114 links long, which should be fine since me largest cog on ...
2
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1answer
500 views

Derailleur mounting position

I'm adapting a derailleur to a bike by welding it onto the dropout. By looking at other bikes it seems to me there is not a very strict specification for where the derailleur hanger goes. It seems to ...
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3answers
878 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 ...
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5answers
2k views

How to remove the broken ball end of a small hex key that is now stuck inside the socket

While trying to replace the yoke of my derailleur I made the mistake of using a multi-tool hex key that was not able to handle the torque necessary for the task and snapped while the head stayed ...

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