Questions tagged [derailleur]
Mechanism to move the chain from one sprocket to another.
765 questions
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What do I need to change on the rear derailleur to match with the new cassette?
I'm going to the Alps soon and thought that it is a good idea to change my cassette from 11-30 to a 11-32 (with a fresh chain).
I started with replacing the chain, so I used like 3 different 'chain ...
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Front derailleur clamp/hanger for Rivendell frame
I am building a bike with a Rivendell custom frameset. The seat tube size is 29.7mm. I am mounting a Dura-Ace FD-R9150 front derailleur that is braze-on.
I'm looking for an adapter clamp but the ...
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1x9 wide range cassette
I am curious to find out if anyone has figured out a viable solution for a 1x9 wide range eg; 11 to 46 or 11 to 50 setup without using a derailleur hanger extension? I have a FS mtb and am not too ...
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Shifting back slightly after shifting to high gear to reduce grinding noise
I tested a Cannondale Optimo 4 (entry level road bike with Claris) and I liked the bike but had 1 issue. When I shift to biggest wheel in front and small wheel in back there is a grinding/rubbing ...
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The bike derailer will automatically drop to the lowest gear in the rear whenever my cadence slows
I have a REI Coop CTY 2.2 bicycle. Whenever I am biking and my cadence slows down, the bicycle derailer automatically (I am not shifting) to the lowest gear on the rear derailer. Any suggestions on ...
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New shift cable damaged after clamping to shifter
I just replaced all the cables and housing on my bike and was annoyed to discover on close inspection that the front derailleur cable has sustained some damage from the cable clamp on the derailleur:
...
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Shimano 400 Rear Derailleur Reassembly
I thought I was removing the rear derailleur so I could straighten the bent hangar but apparently I was disassembling it. Now I can't get the spring wound back around fully for reassembly.
Is there a ...
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Derailleurs compatible with Shimano Claris ST 2400 Shifters
I have a 20-year-old Specialized Sequoia 24-speed road bike. When the groupset was last changed on it, the shop fitted a 3-cog chainset (50/39/30) and an 8-cog rear cassette (28/11), a Shimano Claris ...
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Is it okay for my rear derailleur to be as "compressed" as this when in the lowest gear on the bike?
Recently replaced the cables on this old road bike. When indexing the cable I notice how compressed this derailleur is and the two cogs are almost touching - it certainly doesn't look right to my ...
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Using Burley Coho XC on road bike with Magic Speed Release axle
I have purchased a Coho XC trailer to use with my 2021 Orbea Avant H-60 (disc brake) bike.
I ordered a Burley Thru-Axle after following the Burley axle guide, but on attempting to install it (without ...
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Can I use a vintage derailleur adapter claw on a modern derailleur
I am restomoding a vintage Hi-C branded Schwinn road bike. There is no derailleur hanger on the drop outs so I am in need of an adapter claw. Can I remove this claw from the old derailleur or is the ...
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I need help with total capacity of rear derailleur
I am unsure how to calculate the total capacity for a 1x drivetrain, I have 46t up front and 11-32 10 speed cassette.
How can I determine which derailleur will work with this setup? E-mtb build.
I was ...
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Campagnolo 2x11 Record with GRX derailleurs
I really don't like the Shimano 105 levers on my bike.
I would like to switch them in favour of Campagnolo 2x11 Record, and would like to know if anyone tried to fit them with GRX system:
Front ...
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SRAM AXS XPLR compatability 1x10
I am considering buying an XPLR derailleur (and AXS shifters) for my gravel bike.
SRAM states the XPLR system is designed for a 1x12 drivetrain.
Would it also work with a 1x10 setup? Or even 1x11
Is ...
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Is an Ultegra front derailleur compatible with Sora shifters?
I have a old trek road bike with 2X9 setup. I need to change the front derailleur. Can I use a Ultegra fd-r8000?
My shifters is Shimano Sora.
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Rear derailleur catches and springs towards front of bike when in predominately in the smallest front chainring
I have a Planet X EC-130 carbon road bike with Ultegra group set. I have the stated problem above; it mainly happens while in the smallest chainring and does it at all speeds. It sometimes goes 20 ...
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Original derailleur bolt no longer matches hanger
This post is continued from this one about a rear derailleur that looks awkwardly positioned relative to the frame. After further investigation it looks like the bolt of the derailleur and the hanger ...
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Can I swap an SGS cage on a Shimano RD-M8100 having a GS cage?¹
It's been difficult to locate a new XTR M9100 or XT M8100 with the SGS (long) cage from the few reputable U.S. dealers I buy from where Shimano will honor their warranty. The GS cage versions are ...
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Is the SRAM GX AXS a 1:1 replacement for a x7 derailleur?
The X7 is mated with a SRAM PG 1050 11-36 cassette. I would like to replace the derailleur without replacing the cassette.
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Rear derailleur looking abnormally contracted – What is wrong?
The derailleur is not extended. The cable tension seems ok. What could be the problem?
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Derailleur hanger bent
How can I bent it back
Because its one of those the hanger is a part of the derailleur
If I want to get a new one its the whole derailleur replaced with it
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Which limit screw is which?
I had to replace my front derailleur on my mtb. Now I just need to adjust it however the limit screws are not marked. Does anyone know if the L limit screw is closest to the frame? Or is that one the ...
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Theoretically, about weird but very interesting 3x9 setup? Some knowledge about gearing would be great :)
Is it possible to have a 3x9 setup -
Triple 42T ( 42-32-24 )
x 9s ( 11-13-16-20-24-28-32-36-42T )?
The main question is, what kind of 9 speed derailleur is compatible and how long chain need to be for ...
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Drawing/specification for direct mount rear derailleur hangers?
I am currently designing a custom direct mount rear mech hanger for my bike (as one doesn't currently exist). I've successfully designed and built a standard mount using PVD's Framebuilder Wiki. ...
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Vertical Dropout Derailleur Hanger for a bike that did not come with gears?
I have a bike that did not come with gears. It is a rear hub driven ebike with a single speed. Eventually when the warranty runs out, I want to put gears in it and turn it to a mid drive. Now I know ...
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Multiple gears shifted while not pedaling
It happened again, but much worse this time. Someone shifted the front derailleur from 2 to 1 and the rear derailleur from 5 to 9 without pedaling when I was in school. Does this do any significant ...
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My daughters chain keeps falling off
The derailleur is not feeding the chain to the cassette properly it comes off the cog about half way round and gets spat off the cogs completely.
It looks like the derailleur is bent outwards which ...
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Chain is loose and rubs the upper part of the chain stay
I noticed that my bike's chain is rubbing the chain stay when I use the lower gears.
The bike is new; I'm wondering what the problem is.
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Which electronic shifter to choose?
After a good old fashioned crash because of jumping rear gears I think I am ready to make the move to an electronic shifter/derailleur.
Currently I have a 1x10 setup with internal routing in the frame ...
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Shifter cable broke in the shifter and now the end is stuck in the shifter
So The end of my rear derailleur shifter cable is stuck in the shifter. Is it even possible to get out? See the picture below. Shifting up and down doesn't really do anything to its position.
Edit: I ...
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What can cause the chain to stay attached to chain-ring at bottom causing it to ride up and jam in the frame ("chainsuck")?
I'm looking for possible/likely causes of an issue with my front chain-rings on my bike. It's a 3x8 setup and the problem is worst on the smallest front chain-ring, and worse again when combining ...
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Can't shift into lowest gear on a new road bike (pics)
I've followed the Park Tools Rear Derailleur adjustment video exactly, step by step, because my bike was jumping gears after I reinstalled the rear wheel after changing the tube.
The bike however won'...
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Rear derailleur compatibility for friction shifting
I have a mid-1980s road bike with downtube friction shifters. I'd like to install a freewheel with a larger cog (something like 32 or 34T), but my current rear derailleur won't accommodate that. So I'...
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Why has my derailleur reposition itself so that its out of place?
I have a 2004 Trek Navigator I'm trying to fix up. Everything seemed fine until I switched gears and heard loud odd noise plus my pedaling got alot harder. Upon inspection I found my rear derailleur ...
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New shifters for MTB to Gravel Bike (Deore M4120)
I have a MTB with DEORE RD-M4120 as the rear mech, and am currently running 10 speed, and am looking at converting this into a gravel bike. I want to put drop handlebars onto this new build, and was ...
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Advice needed to upgrade my groupset to make climbing easier
I have a Canyon Ultimate CF SL 8.0 Ultegra Di2 2020 with a rear 11/30 cassette and a 52/36 chain ring. It has a short cage rear derailleur (Ultegra Di2 R8050 SS short cage). I do long distance cycling ...
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Why there are no or few bicycles with coaster brake and external speed gears?
As I see, all bicycles sold with coaster brake never feature external speed gears with sprockets and derailleur. Bicycles that feature such a gear mechanism offer rim or disk brakes, operated by hand. ...
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Can freewheel of coaster brake be used in combination with derailleur?
There is "coaster brake" mechanism, it consists of not only brake, but also of freewheel. As can be seen in answers in Why there are no or few bicycles with coaster brake and external speed ...
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Trouble shifting into higher gears - Shimano RD-4700
My RD-4700 rear derailleur is having some trouble shifting into the highest gears / smallest cogs.
When I shift up past about 6th or 7th the shifter paddles just go floppy.
I've taken the chain off ...
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Modify/hack rear derailleur cage size
I've listened that it is possible to modify the cage size of a rear derailleur.
For instance reducing a long (SGS) to a medium (GS) or short (SS) cage size.
Is it possible on all brands?
Just shimano?
...
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Front derailleur struggles to shift to smallest chainring, when it eventually shifts, the chain goes too far and falls out
So i am trying to adjust the front derailleur limit screws and cable tension, but i can't get it to shift smoothly. It is struggling to shift the chain to the smallest ring, especially under torque, ...
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Derailleur not moving even when manually pressed
my bicycle is not shifting. The shifter is working fine (cable tense up and down with it).
I think the problem has to do with the derailleur. I have seen videos that manually press it to diagnose ...
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How to mount Sram X01 pulley wheel spacers
Ive ordered a new set of pulley wheels for my Sram X01 derailleur but I do not know where to mount which spacer. The set came with 3 "deep" and 1 "flat" spacer as seen in the ...
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What is the best way to increase gear inches on an old bike?
I only recently got into bicycling and without knowing anything, I bought a bike from a local used bike distributor.
Here's what I've learned about the bike.
The frame, seat, and handles are original ...
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Are there special heavy-duty front derailleurs for recumbent trikes or recumbent bicycles?
I have a "normal" short wheelbase highracer recumbent bicycle (Radius Hornet I) for about 20 years now, so I'm generally used to recumbent-specific things. But since recently I also own an ...
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What driver body and disk brake compatibility is important for setting up a rear wheel?
I'm looking at a wheelset which comes with either a Shimano or XDR driver body option. So I assume that has to be compatible with the cassette, but does the cassette also have to be compatible with ...
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Aligning a Shimano direct mount derailleur
I was suffering bad shifting and skips and my derailleur appeared to be bent slightly inwards, so I thought I’d check it with a Park DAG 2.2 I already owned (for a previous bike).
Instead of the ...
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Can't find derailleur hanger for an old Nakamura
I tried local parts shops and tried the internet and still can't find the right hanger, And I no longer have the old broken one.
I can't even find the bike on the internet, The only photo I found was ...
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Trek Marlin 7 (2022), Gear Shifting
I have a issue with my Marlin 7 (2022).
It has a Shimano Deore M5120 rear derailleur.
When the bike is on the bike stand the bike shifts perfectly.
When I'm riding the bike the bike shifts fine until ...
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