Questions tagged [derailleur]

Mechanism to move the chain from one sprocket to another.

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What derailleur hanger is this and what is actually compatible and what needs changing?

Bought this bike second hand. Obviously these are not stock components here, the rear derailleur should not be direct mount. I can not seem to find the specifications for the hangar anywhere. Also I ...
montbiking's user avatar
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2 answers
69 views

Shimano 11/42 cassette, 11 speed derailleur compatibility

Existing trek domane SL6 (2021) with ultegra 11speed mechanical gruppo shifters r8020 fd r8000 with 2x 46/34 rd r8000 11spd 11/34 To get shorter gear inches, looking at changing to 11/42 ( or 11/46) ...
Mak's user avatar
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2 votes
1 answer
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pedals only move bike at highest gear

Recently my bike will only move if I’m in the highest gear. I can pedal at lower gears but it will not move my bike forward at any reasonable speed and when I get up to even a very low speed the ...
Sarah's user avatar
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4 votes
0 answers
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Sram AXS derailleur does not shift

Have you encountered a problem where a rear AXS derailleur stops shifting? Any suggestions? I bought a mint 2023 GX AXS derailleur on Marketplace, it worked for the first short test ride on a road but ...
molexi's user avatar
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3 votes
2 answers
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Vintage derailleur identification

I have a vintage Shimano derailleur that I'm trying to identify, specifically to figure out which jockey wheel set is compatible as mine badly need replacing. The derailleur is marked "Shimano ...
Kyle's user avatar
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6 votes
2 answers
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Order of setting up new shifting system

I'm getting close to being finished with my Trek 520 frame-up build (with custom drivetrain). The only thing that remains is cabling the front and rear derailleurs, setting the limit screws and ...
Dan's user avatar
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SRAM 1:1 shifter + Shimano 11 speed MTB RD

I'm planning my next bike build with an 11-50 cassette but I don't want more than 10 gears for personal preferences. I've seen Chinese-brand drivetrains (LTWOO) that can do this but I want something a ...
Gregory Leo's user avatar
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What size front derailleur do I need for a 11/32 cassette and medium rear derailleur?

Upgraded 11/32 cassette. looking for replacement front derailleur
Yvette Moore's user avatar
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1 answer
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Which rear derailleur can I put instead of Shimano Acera

My rear derailleur on Cube Aim Race 29" has broken on the holder. Except for this (and prior to the holder breakage) the derailleur has completely stopped working for some reason. It twists into ...
Vladimir Despotovic's user avatar
2 votes
2 answers
135 views

How can you determine that your derailleur is bent?

I have no experience adjusting the derailleur until recently. I followed the nice instructional video from Shimano. After I finished with the bike, a final test on the rack showed I was able to spin ...
AdamO's user avatar
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2 answers
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Slight play in rear derailleur

for the first time I am doing basic drivetrain maintenance and I noticed slight play in my rear Shimano XT 12SPD mech. It does not occur at the place where the derailleur is connected to the hanger ...
samokosik's user avatar
3 votes
3 answers
616 views

Is Mean Time To Retune FD and RD a major distinguishing factor between Sora and Ultegra?

Having gained experience riding both Sora and Ultegra, I'm puzzled that 2x9 already provides such narrow gaps that I'm entirely comfortable riding Sora (it helps that the cassette is 12-25), and that, ...
Sam7919's user avatar
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5 votes
2 answers
1k views

What's going on with the bonkers derailleur?

My friend changed her tyre with the bike upside-down, struggling to slot in the axle and the derailleur just fell off from pressure with her bare hands. She is far away so I need to understand what ...
bandybabboon's user avatar
2 votes
1 answer
115 views

Any fixes for pinch bolt crimp refusing to lock in place?

My cable shifter couldn't be secured in place because the stub of the metal shifter clamp keeps sliding over the derailleur's metal surface when applying torque to the bolt. The clamp, instead of ...
sagaris's user avatar
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11 votes
4 answers
3k views

Does anyone make dummy batteries for eTap AXS derailleurs?

I just got a new Specialized Roubaix Expert with SRAM parts. I discovered that lengthy car rides drain the batteries because the derailleurs are triggered into activity by motion. Solution? Take the ...
Robusto's user avatar
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3 answers
297 views

Sora front derailleur cannot reach top chainring cleanly

I bought a new bike specced with a sora front derailleur and left brifter. I've been unable to make the front derailleur shift properly. I sent a message to the manufacturer (no response yet) but I ...
Edward's user avatar
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5 votes
1 answer
385 views

Altus 9-speed shifters&derailleur paired with a 10-speed road bike cassette

My family has a road bike, set with Altus 9-speed shifters and a rear derailleur, paired with a Shimano HG200-9 cassette. Recently, I replaced the cassette with a 10-speed road bike cassette, As a ...
LLRL's user avatar
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4 votes
1 answer
201 views

rear derailleur installation

Today I installed my new rear derailleur and chain. I am not completely satisfied. My questions are.. Is my cable clamp routing correct? I know my cable is frayed, i will use a new one. Did i install ...
Daniel's user avatar
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1 answer
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Chain repeatedly slips on rear cogs to next higher gear...and sometimes back and forth. What to adjust?

EDIT: Just to be clear, everything has worked fine with the bike and the Kickr up until a few weeks ago (that is, for about six months the combo has worked fine). So something's gone a bit out of ...
Cerulean's user avatar
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1 vote
0 answers
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Shifter only clicks in one direction

My bike shifters on both the front and rear derailleurs suddenly stopped wanting to shift down. They both shift up no problem and the cable looks fine but when I try to shift down on either of them ...
Mike's user avatar
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3 votes
2 answers
644 views

Replacing a hanger mount derailleur with a direct mount derailleur

I got a low-quality walmart bike for free in decent condition. I am trying to make it rideable. I have given up on the stock derailleur and bought a cheap shimano tourney direct mount derailleur to ...
Edward's user avatar
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2 votes
1 answer
93 views

Unable to backpedal - jockey wheels on Campagnolo derailleur

I have Campagnolo Athena rear derailleur on my road bike. Never gave me a hint of trouble. Always kept clean and lubed. Never ridden in the rain or in dirty conditions. Yesterday I was not able to ...
gil's user avatar
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14 votes
9 answers
4k views

Beginner breaks rear derailleur, what might have gone wrong?

I broke the rear derailleur on a borrowed bike. I'm trying to understand why. Until two months ago I knew nothing about bicycles. I bought a worn down cheap second hand bike. It took me way more time ...
BikeBreakingBeginner's user avatar
7 votes
3 answers
328 views

Chain Links remain raised (i.e. sticky link)

I was trying to adjust my rear derailleur but I heard a noise. I found that when the chain went through the pulleys one link of the chain stayed up and made a noise. How do I fix this?
Alberto Murgia's user avatar
5 votes
3 answers
134 views

Derailleur hanger repair interferes with highest gear

Bike was in the shop recently and they said they needed to repair the derailleur hanger threads, which is integrated with the frame. They said they would repair the threads with a helicoil. When I ...
Kris's user avatar
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3 votes
3 answers
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9 speed chain on 8 speed derailers to reduce chain rub

I'm getting some chain rub on the hardest gear in the front and 2 hardest gears in the back where the chain hits the front derailer cage outer side. When I spin the pedal it seems like the chain is ...
Lightsout's user avatar
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1 vote
1 answer
104 views

Changing a derailleur

Can I change a deraiileur? Where is one suitable for this bike? I commute about 40km round trip. Both my bikes were stolen last night and I recovered one dumped nearby with the derailleur broken and ...
Kilisi's user avatar
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10 votes
1 answer
1k views

Why aren't derailleur hangers made into standard shapes?

That small piece of metal can render a bike unrideable, and sometimes a repacement is impossible to find. There are standards for headsets, bottom brackets, brake mounting points, OLD and dropouts, ...
Robert's user avatar
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1 vote
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Shimano 105 r7000 front derailleur hard and clunky shifting, shifter harder to shift

A total newbie to DIY bike repair here, and my Shimano 105 r7000 FD is shifting really harshly after a wash. Washed it with dish soap plus water solution, however I did not give the FD any specific ...
justafred's user avatar
2 votes
2 answers
1k views

Upgrading my shimano road groupset, compatibility issues

I'm in the process of upgrading my road bike's groupset, since it's quite old now. I don't want to blow my budget so I wish to upgrade as little as I can with the most impact. I currently ride my road ...
korxz's user avatar
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8 votes
1 answer
476 views

Can any front shifter be used for 3 x 9?

I want to buy a new front shifter for my 3x9 speed MTB. The XTR M970 shifter is rare and expensive. Can I just use the front shifter from a 2/3 x 10 system? e.g. Shimano XTR M980 ? Are Shimano front ...
D D's user avatar
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0 votes
0 answers
30 views

My ultegra front 3x derailleur adjustment screws are seized and the shift is unreliable into the small cog. Can I replace it with something similar?

I need to replace my 15-year old Ultegra triple front derailleur. I can't find the same model for sale online. What alternative options can I try please?
Geoff Watson's user avatar
4 votes
2 answers
331 views

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 ...
Mat's user avatar
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2 votes
1 answer
65 views

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 ...
Michael Egger's user avatar
1 vote
3 answers
491 views

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 ...
Raymond Dunne's user avatar
1 vote
2 answers
118 views

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 ...
Lightsout's user avatar
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6 votes
0 answers
148 views

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 ...
Meg's user avatar
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1 vote
1 answer
113 views

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: ...
SSilk's user avatar
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3 votes
1 answer
202 views

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 ...
user66598's user avatar
  • 947
0 votes
1 answer
631 views

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 ...
Kevin Marman's user avatar
10 votes
4 answers
3k views

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 ...
Antonio's user avatar
  • 101
2 votes
2 answers
150 views

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 ...
Ferdia McKeogh's user avatar
5 votes
3 answers
1k views

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 ...
duhnlic's user avatar
  • 141
1 vote
1 answer
277 views

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 ...
Confused's user avatar
1 vote
2 answers
409 views

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 ...
mrzob's user avatar
  • 113
3 votes
2 answers
183 views

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 ...
Adam Jones's user avatar
6 votes
2 answers
916 views

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.
Claus's user avatar
  • 61
1 vote
1 answer
293 views

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 ...
Neily H 's user avatar
2 votes
4 answers
559 views

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 ...
Erwann's user avatar
  • 250
0 votes
1 answer
586 views

Which SRAM derailleur is an upgrade to the X7?

The SRAM x7 is mated to a PG 1050.
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