Questions tagged [derailleur]

Mechanism to move the chain from one sprocket to another.

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1answer
1k views

Front Derailleur Chainring Size Tolerance

I'm rebuilding an old bike and have an existing crankset with 52-42-30 chainrings. I'm looking for a front derailleur. Most of the triple front derailleurs I've come across say they don't support a 50 ...
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3answers
2k views

Trimming Shimano FD-R3000 front derailleur

My front derailleur is a Shimano FD-R3000. I have been trying to adjust it following the ParkTool video at Basically it seems to be working OK now: the chain is not ...
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2answers
531 views

New build, front derailleur won't shift to outer cog

I'm building a new bike using a Deore T6000 front derailleur with Microshift BS-M10 bar end shifters. I'm having trouble getting the derailleur to shift the whole necessary range and am looking for ...
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0answers
404 views

What is the thread size/measurement of the derailleur barrel adjuster?

The barrel adjuster threads on my commuter bike's RD have been marred when the barrel adjuster got bludgeoned on a side crash and I want to chase the threads before screwing in the replacement barrel ...
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1answer
1k views

Front gears won't shift

I am very new to the bike maintenance, but want to learn how to do it myself. I have got a MTB which won't change the gears at front. It's basically stuck in the granny gear at the moment. I tried to ...
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1answer
462 views

Pulley for 10 Gear Derailleur for 9 Gear Chain

I am using a 10 gear XTR derailleur on a 9 gear cassette with a 9 gear chain and the tension pulley of the derailleur looks like needing replacement (despite teeth being very sharp it seems to work OK ...
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1answer
147 views

Is the Shimano 2303 crank arm and the 2300 crank arm the same?

I bought a Shimano 2303 crankset (52/42/34 triple) by mistake although I should have bought a 2300 crank If I remove the inner 34t, will it have the same structure as 2300 crank? By structure I mean ...
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1answer
84 views

Adjust deraillers after changing chain?

I just changed the chain on my Cube Acid 2X11sp mtb. I replaced the old chain with an exactly similar brand, model and length new chain (shimano). Is it NECESSARY to readjust and finetune the speed ...
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3answers
3k views

How to cut derailleur cable housing

This is a job I will do very rarely, so I would prefer to avoid buying a specialty tool, if possible. Unfortunately I don't own a dremel. Side cutters just mashed everything and did not cut at all. ...
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2answers
701 views

Deore RD M592 with old school shimano trigger shifter

I have an old school Devinci Coyote (2002) whose Alivio rear derailleur is having trouble shifting properly. I was wondering if I could replace it with a new Deore M592 without having to change the ...
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1answer
62 views

Maintenance as my Derailleur are squeaking due to the everyday use and carelessness shown while changing gears while the cycle is static

What extra steps should I take to extend the life of the Derailleur gears on my Btwin Rockrider 340 besides oiling them ?
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1answer
493 views

Derailleur play between cage and knuckle

I have a Shimano 2300 rear mech that's done about 10,000m over ~7 years. Lately I've had trouble getting clean shifting and find myself constantly twiddling barrel adjusters... I'm certain the cable ...
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1answer
292 views

Is there a front derailer type that can be mounted on a frame without braze on or fitting on the seat tube, or clamping?

As the question says, is there a front derailer type that can be mounted without having a fitting or braze on on the seat tube, or without clamping to the seat tube (because it's a weird shape, or ...
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2answers
730 views

Removing Derailleur Hanger from Devinci Spartan

So I'm in need of new derailleur hanger and bolt kit. My question is how to remove the hanger from my kinda frame (2018 Devinci Spartan). I'm used to just using a 5mm Allen key to unscrew two little ...
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2answers
4k views

Replacing Claris FD 2400 with R2000

My bike has a 2x8 speed Shimano Claris 2400 front derailleur and ST-2400 shifters. The FD is damaged. Can I replace it with the newer Claris R2000 FD? Shimano's compatibility guide indicates that it ...
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0answers
62 views

What's the type of polymer material used in friction bushings in Sram rear derailleurs clutches?

The friction bushing of an (older) Sram rear derailleur clutch is shown below. What type of polymer material are these made out of? I'm also interested to know what friction materials are used in the ...
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1answer
140 views

Front derailleur range suddenly has become very short

For a while when I was riding, there was a stiff feeling changing from medium to high on the crank. Yesterday it wouldn't change at all. I checked the adjustment of the High and Low screws by ...
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1answer
90 views

What front derailleur is this? Want to replace/upgrade

Hi I've bought a foldable bike and am thinking of changing the derailleurs to Shimano, but I could not figure out what type it is. The link the to the bike is: https://www.forever-bicycle.com/html/...
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0answers
387 views

SRAM eTap rear derailleur chain drop issue

I’m having an issue with my chain falling off the lower pulley wheel when (1) I hit a significant bump or (2) shift from large ring to small ring. But only in cogs 6, 7, 8. Any suggestions? I’ve ...
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1answer
4k views

Pros and cons of long and short derailleur cage?

I'm thinking of buying a new derailleur in the future, but I don't know what type of derailleur to buy, there's long and short cage derailleurs but is there any differences? I'm not sure if this ...
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1answer
156 views

Levels of derailleurs, freewheels and chains

What are the levels of derailleurs (Shimano probably) I know Altus and Acera but don't know the higher end ones. I am putting this on my Sondors Fat ebike. I will be using a 7 speed freewheel, and a ...
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4answers
13k views

What options do I have if my rear derailleur breaks when I'm out on a trail?

I ran into an unfortunate situation earlier this week. I was out on a mountain bike trail, alone — just me and my hardtail. I'm pedaling, when I suddenly hear a CRUNCH and my bike stops. The hanger ...
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1answer
480 views

Broken Shimano FD-R453

I have a Shimano FD-R453 front derailleur that needs replacing. 50t and bottom pull with a 31.8 clamp. There are three gears in the front and 9 gears in the back. Could somebody help me with getting ...
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1answer
67 views

Change derailleur for new cassette?

I currently run Shimano SG-B-53/39 chain rings coupled to a 9 speed 13/23 cluster. If I was to change my cassette to a 9 speed 11/32 would I need to also change my derailleur?
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1answer
95 views

Need derailleur hanger

I have what I believe is a 1994 Cannondale. I need a derailleur hanger and I’m tired of thinking I’m ordering the right one and it’s not. Can somebody please tell me how to find out what my bike is? ...
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2answers
360 views

Shimano STI does not shift up/to lower cogs

Typ: Shimano RS505 2x11 hydraulic Problem: Up shifting is possible to the 5th or 6th cog, after this the STI does not give the click feedback and the derailleur does not move to the next smaller cog. ...
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1answer
625 views

Shimano Metrea ST-U5060-R compatibility

So I'm trying to find out if Shimano Metrea ST-U5060-R would be compatible with any Shimano 11 rear derailleur? Also, would it also be compatible with the T4700 Tiagra derailleur since it seems to be ...
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2answers
2k views

How to determine which cassettes I can use with my derailleur?

I am trying to understand which cassettes I can install on my bike. I've understood that the length of the derailleur also determines which cassettes will fit. In my case I have a triple (see picture ...
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1answer
2k views

What is the top sprocket?

I am reading the Shimano specs and I cannot figure out what is the "top sprocket". An example: https://bike.shimano.com/en-EU/product/component/sora-r3000/RD-R3000-SS.html "Low sprocket" (I couldn' ...
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1answer
768 views

Can a universal derailleur hanger be a suitable long term solution?

I've recently snapped my derailleur hanger for an old Apollo Raceline Peleton road bike. Have had no luck sourcing a replacement that fits, and neither have local bike shop. Has anyone been in a ...
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1answer
426 views

Will Shimano Di2 synchro shift work with an XT (Mountain) rear derailleur with an Ultegra (Road) front derailleur on the same bike?

Basically, can I mix a mountain Di2 rear derailleur (specifically, the RD-M8050-GS) and with a road Di2 front derailleur (specifically, the FD-R8050)? Will firmware updates and syncro shift still both ...
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3answers
2k views

10 speed rear derailleur only shifting 7 gears....losing my mind

OK, so I have a rough and ready road bike (Planet X London Road) that is not shifting right.... It is running: Shimano Tiagra 4600 Shifters (3 x 10) but running it a 1x10 with one front chainring ...
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2answers
5k views

What does this barrel adjuster do on the rear derailleur (SRAM Apex 1)?

On this SRAM Apex 1 derailleur, what does this barrel adjuster do? What happens if I turn it clockwise/anti-clockwise?
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3answers
8k views

Cannot shift to lowest gear - chain too short?

I’m in the process of switching from an 11-25 to 11-32 rear cassette. The upgrade has involved replacing the cassette, rear derailleur (short to medium cage) and fitting a new chain. I can cleanly ...
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1answer
149 views

I can't shift gears

My friend gave me his bike because it was too small for him, I was new to biking so I didn't notice till now that T can't switch gears. My front derailleur is on middle gear out of 3 and the rear on ...
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1answer
958 views

Shifter/brake-lever compatibility with front and rear derailleurs

I am currently converting my bike from flat bars to drop bars for a long touring cycle. I used to have Shimano SL310 shifters (8x3), but have now bought Shimano Sora ST-3300 (8x3) to mount on the drop ...
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1answer
6k views

Very stiff front derailleur

My girlfriend has been having problems with her front shifter/derailleur since she got her bike. For some reason, moving the chain from the middle ring to the big ring at the front, is very stiff. ...
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2answers
6k views

Front derailleur cable suddenly very slack (no shifting), not sure what's caused it

I last rode the bike on Sunday. Throughout the ride I noticed the front shifter (grip friction shift, Shimano) was feeling "looser" than normal (hard to describe, it didn't feel "right" and seemed to ...
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5answers
1k views

Remove old non-indexed levers for gear changing to make "fixed" speed bike?

I recently got an old bicycle for the sole purpose of using it on a trainer. It has old non-indexed levers for gear changing and they don't seem to work OK. The front one slips into lower after a ...
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1answer
116 views

Derailleur out of alignment after cable snapped

The front derailleur cable snapped on a friend's bike, she shifted it with her hand to a rideable position, and rode for a few weeks. She asked me for help replacing the cable, though when I replaced ...
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2answers
205 views

Would a IGH drive train last longer than a derailleur drive train?

Would a single sprocket + 8 speed chain + single chain wheel used in combination with a IGH last longer than a 10 speed cassette + 10 speed chain + 3x chain wheels? Image I have 2 bicycles. Bike 1 ...
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1answer
1k views

How do I figure out what crankset replacement will fit my derailleur?

I have a bike with a Shimano FC-M560 crankset in the front which I want to replace. I naively bought a Shimano FC-TY301 crankset, thinking that there's norms and that 3-speed cranksets are more or ...
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2answers
1k views

Test drive of bike derailed chain easily ... bad sign or nothing?

I tested a bike at a bike shop today. I rode it about 30 feet / 10 meters, turned left up a very shallow hill, hit the left (forward) dérailleur and the chain came off (went past innermost front ...
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2answers
807 views

Help replacing front derailleur

Evening, total newb question maybe but it’s driving me mad. I have a Carrera Vulcan 2015 model which I bought second hand to aid my physiotherapy. From what I can work out by the spec sheet the ...
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2answers
5k views

Will 2 x 10 speed front derailleur work with 11 speed set up?

Would an existing 2x10 front mech work with a new 11 speed rear set up? Using all Shimano SLX with 11 speed shifter, rear mech and chain. Front chain rings are 2 x SLX 38/28.
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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 ...
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1answer
724 views

One extra position on front derailleur besides trim

After I changed shift cables, I have 4 positions on my front derailleur. WTF? I have a double chainring. I have a trim position as well, but after shifting to the big chainring, I can still move the ...
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1answer
829 views

Front chainring spacing difference between Shimano and Campagnolo?

I want to upgrade my mid 80s road bike from a 50 tooth to a 53. But the BCD of the big triple chainring is some rare standard that it costs less to buy a whole (used) crank instead. And of course this ...
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1answer
66 views

Adjustment necessary for stationary trainer

I am looking at purchasing a stationary trainer that will be shared with my wife and would prefer to do a wheel off trainer. Both of our bikes have a 11-28T cassette. So, theoretically, if the ...
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0answers
305 views

RD-TZ40 ME Replacement

I've damaged the rear derailleur on my bike, and it needs to be replaced. I don't really have an LBS. I've looked around online, but I can't seem to find a correct replacement. I should clarify that ...

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