Mechanism to move the chain from one sprocket to another.

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2
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2answers
8 views

Does Shimano XTR RD-M9000 SGS 11-Speed Shadow+ MTB Rear Derailleur Long Cage work with 10speed XT shifter?

I just bought a used bike with a broken 10 speed XT rear derailleur. Would a NEW Shimano XTR RD-M9000 SGS 11-Speed Shadow+ MTB Rear Derailleur Long Cage ( 182006158222 ) be compatible with 10 speed XT ...
4
votes
2answers
332 views

How can I fix my rear derailleur's B-tension adjustment?

I've noticed that my rear derailleur (Ultegra 6700) will not return to where I've set the B-tension adjustment. Pulling it away from the hanger means it will just stick there, or maybe move back a ...
1
vote
2answers
48 views

Downshifting problems

My wife has a bicycle like this. It is only a few months old and it gets light use on weekends on (smooth) some dirt roads. Recently it sometimes fails to downshift at the rear (i.e. shift to the ...
3
votes
4answers
3k views

Shimano 105 rear shifting issues

I'm disappointed with my new Cannondale and it's 105 group, I expected this to be a major upgrade from my previous trouble free bike with the bottom end group set. It's done about 500 miles, had new ...
2
votes
1answer
52 views

Shimano Rear Derailleur Max Capacity

I need to get a new rear derailleur. My chain rings are 53/39 and my cogs are 28/11 so if I am not mistaken I need a total capacity of (53-39) + (28-11) = 31. I need a 11 speed compatible rear ...
1
vote
4answers
292 views

SRAM Force 22 chainset in an otherwise 10-speed SRAM setup

I notice that SRAM web site still lists "regular" 10-speed Force chainset as one of their products. However, my attempts to find it for sale online came up with almost nothing. It seems to be "barely" ...
5
votes
2answers
4k views

Is it practical to replace two sprockets on a cassette?

My bike has 53/39T chainrings and a cassette with 12,13,14,15,17,19,21,23,25 sprockets, but I like to ride up steep mountain roads. Is it possible (without great expense) to replace two sprockets to ...
1
vote
1answer
601 views

Why 9 speed front derailleur cannot handle 10 speed rear derailleur?

Some people are using non compatible components on their bikes. For example, using Tiagra's old 3x9 speed FD (4503?) with a 10 speed RD. And it works. So what is the point of saying "Dear customer, ...
0
votes
0answers
25 views

Frame - FD compatibility

I have a Merida Speeder 200 (2015). I am going to install a drop bar handlebar. I've bought sora 3503 brifters and a new front derailleur(sora 3503 too). My problem is, I didn't know anything about ...
1
vote
2answers
43 views

Rear derailleur does not shift down

I'm working on a bike where the right shifter was not working and I replaced it. it's a 7 gear cassette and the problem now is that the rear derailleur would not shift down past 3. When I manually I ...
3
votes
2answers
72 views

cable tension for Shimano 105 Front derailleur is very tight

I just got a merida scultura 400 and on the biggest chainring there's rubbing on the outside of the front derailleur cage. the only way that I can lower this is by tightening the cable by ALOT. is ...
0
votes
1answer
68 views

Rear derailleur needs a couple pedalstrokes to change gear

As of late I'm having some trouble with my rear derailleur. When I shift specific gears (most likely to happen to the middle gears), the rear derailleur feels like it doesnt have enough power and ...
23
votes
11answers
8k views

Is there such thing as an automatic transmission for bikes?

Has anyone ever designed or manufactured an automatic transmission (or automatic shifter?) for cycling? I imagine such a device would automatically change the gearing to allow the rider to maintain ...
1
vote
0answers
59 views

Campagnolo Cambio Corsa

Does anyone make this sort of system and sell it today, or is my only option looking for someone selling theirs? I've googled whether similar systems are being made today but found nothing to my ...
12
votes
1answer
8k views

Chart for bicycle component quality?

I'm not very familiar with all the different component groups available and wondered if there's a chart that ranks their quality (or price). So I'd know that Shimano 105 is the same level as SRAM ...
1
vote
1answer
41 views

Front derailleur takes 6 clicks to shift gears, instead of 3 [duplicate]

I've just stripped all cables and chain from a badly kept bicycle and replaced them. I've correctly adjusted the rear derailleur and it works great. However, front derailleur which only has 3 gears ...
5
votes
2answers
1k views

(Automatic Bike Project) amount of torque required to change gears?

I am planning to build an electronically controlled automatic bike transmission for my senior design project. I'm personally more of an electrical guy, so dealing with the mechanics is somewhat new to ...
0
votes
1answer
59 views

Rear Derailleur won't move [closed]

I've changed my chain, and now when I shift into lowest gear, the rear derailleur won't move back out, and the cable goes slack. Any insight?
3
votes
1answer
134 views

Probably Screwed up my Derailleur shifting from 1-6 without pedaling

So I've had this problem for a couple months now, what happened was I was being stupid and seeing what would happen if I shifted 1-6 without pedaling... As a result, the shifting now is screwed... The ...
11
votes
4answers
73k views

How to calculate the capacity of a rear derailleur

It's easy to calculate what capacity of a rear derailleur will be needed based on the size of the big and small chainring and the big and small cog. What about the converse question, how to calculate ...
3
votes
2answers
124 views

Bike broke, strange parts came out, and doesn't know where to find exact replacement

My friend's bike broke and this thing came out... From various sources I found that it's probably a cog from deraileur. He went to bike shops but none could find a replacement that's for this exact ...
2
votes
3answers
3k views

I want to remove my front derailleur?

I'm new to biking only doing it since the past 3 months. I don't use my front gears much since i'm pretty tall and lower gears means going at a very high cadence for little output. so wondering if i ...
1
vote
1answer
80 views

What is the relationship between block, gear speed and derailleur? With Pictures

I am buying a new bicycle. The seller tells me it is "14 speed with 8 speed block, but the derailleur won't reach the lowest gear, so I will switch to 7 speed block". How many gears will the bicycle ...
4
votes
1answer
9k views

Which pulley is which on my Shimano STX RC derailleur?

I disassembled my rear derailleur to clean it; when I removed the sprockets they basically looked the same; both jet black and caked with all sorts of black grease-like-stuff. I figured they were the ...
3
votes
1answer
1k views

Converting a short cage rear derailleur to a long cage derailleur

Is it possible to convert a short cage rear derailleur (for example the Huret Svelto) to a long cage derailleur by just taking the lower cage and replacing it by a longer one?
3
votes
1answer
44 views

SRAM 2x10 shifter-derailleur combination

I am looking to upgrade parts on my Rocky Mountain Metropolis bicycle and want to go to SRAM products. Since I ride my bike everyday, I want the best SRAM parts. Looking at the Red line. That being ...
5
votes
7answers
6k views

What to use to clean a derailleur?

I'm not sure what type of solvent to use to clean a derailleur.
0
votes
4answers
78 views

Shimano Ultegra 6800…what do I need?

I'm gearing up for my first bike tour. I have an old motobecane cross bike, I think it's a 2007. I need more granny gears. Right now I have a 9 speed 12-26. I'm looking into the Shimano Ultegra ...
2
votes
1answer
168 views

How to prevent my front derailleur from rubbing on my back tire?

Recently I tried adjusting my front derailleur (Shimano 6800) so that it wouldn't rub my chain when I was in the highest gear. After playing around with the angle as well as the limiting screws, I ...
12
votes
2answers
14k views

Chain slipping off derailleur jockey

Last week, I had to abandon a training ride due to my chain slipping off my rear derailleur jockey wheel. This would only happen when shifting, and most often when either shifting chainrings or ...
31
votes
7answers
11k views

What's the efficiency of hub gears compared to derailleurs?

What's the efficiency of hub gears compared to derailleurs. I know that hub gears are not as efficient, a part from being heavier, how much will I loose in performance if I use hub gear?
2
votes
1answer
65 views

Braze on or what sort of clamp on a Cinelli frame?

I'm seeing a ridiculously good local deal on a Cinelli Experience frame. I think I'll build it up with entry Campagnolo stuff (also seeing a deal). I am mildly confused about the front derailleur ...
7
votes
6answers
20k views

Rear derailleur shifting poorly, skipping gears

I've got a Shimano Sora on a 8-gear cassette, and have odd behavior and skipping, shifting under stress. This started with a trip to the mechanic for a tune up which replaced the chain. I had some ...
1
vote
2answers
96 views

derailleur recommendation

I have been experiencing some issues with my rear derailer. I played around with it quite a bit to adjust it correctly. Finally after giving up, I took it to the shop and the guy showed me that the ...
2
votes
1answer
233 views

Play in Jockey wheels Sram X7 rear derailleur

I have an SRAM x7 rear derailleur only been using it a few months (through the rain) and the jockey wheels seem in a bad way. There's a lot of side to side play in them and the teeth look sharp when i ...
0
votes
3answers
91 views

gears overshifting issue

As I have explained in my previous post here I have changed my rear shifter cable and housing. But I'm still having issues with shifting gears smoothly. It overshifts at particular gear combinations ...
3
votes
3answers
176 views

Front derailleur never alligned

So I'm working with the park tool tutorial but I've done it a couple of times in the past. When adjusting my Shimano Deore Front derailleur (height and rotation) it lines up great but when I tighten ...
1
vote
1answer
57 views

New Shimano TX55 Not Shifting

I am having a problem with my rear derailleur. I installed as per instructions, adjusting the H and L limits to what I believe is proper. The problem I am having is that when I am in 7th gear, ...
2
votes
1answer
57 views

Upgrading front drailleur

I have a Sora 2x9 front derailleur, and a Tiagra rear derailleur. I want to upgrade the Sora component. Do I need to be concerned about anything other than getting another 2x9 front derailleur? ...
2
votes
1answer
108 views

Changing Crankset on a bicycle

I have a fixed gear BTwin My Bike White. I need to upgrade but the resale value is too low for it. So I was thinking of adding gears to it which might click the real deal for me. Can I convert it ...
1
vote
2answers
303 views

How to change 2x11 to 3x11 on mtb

Hey I was wondering how you would change a chainset from 2x11 to 3x11 on a Carrera Fury (SRAM components) Thanks
2
votes
1answer
302 views

Which rear mech to replace sram X-9 10 speed 2x10

I have a Whyte 905 2011 with a 12-36 Sram cassette and an X-9 medium cage rear derailleur. It's not been attenuating well for some time despite efforts to adjust. The bike shop couldn't fix it. So i'm ...
4
votes
2answers
230 views

Rusty Front Derailleur – Replace or Repair?

My front derailleur has stopped shifting. Have a look at that rusty spring. Is it worth trying to fix, or should I just replace it?
6
votes
3answers
266 views

Why are derailleur jockey wheels commonly made of nylon?

Almost all derailleurs seem to come from the factory with nylon jockey wheels . What is the rationale for the use of nylon (rather than alloy or aluminum)? Is it merely weight savings (which would ...
0
votes
4answers
167 views

Derailleur/Gears Locks Up/ Freezes Up/Stalls

Hey guys I have a specialized mtb with the old oval chainrings and lately it's been locking up. When I start pedalling "hard" or faster the crank stops turning and then jumps forward a bit and ...
1
vote
2answers
148 views

Is this cracked rear derailleur safe to use

So I've been building up a late 80's steel frame to a modern 11 speed, but still using downtube friction shifters. After doing a few runs up and down my street all felt OK so I decided to take it out ...
0
votes
3answers
92 views

Can I ride a triple front chainring with no front deraileruer

I've managed to strip the threads on my front deraileruer mechanism. Its off the bike now - can I ride it as-is until I locate a new front mechanism? The chain does stay on the front chainring where ...
2
votes
2answers
56 views

How to replace derailleur cable housing?

My derailleur cable housing (sheath) has exploded: I bought a new sheath of the exact same length: PROBLEM: Now I realize that unlike brake cables that are like []------, derailleur cables seem ...
5
votes
2answers
118 views

Problems with front derailleur shifting on an inexpensive bike

I bought a cheapish bike (Nakamura) couple of years ago, and it generally serves me well. Main problem that I have is that shifting gears, especially front gears often gets out of tune. After only a ...
1
vote
3answers
469 views

Can't shift to gear one or two

I had an issue where every time I put my bike in gear 3, it would just keep "skipping". By this I mean that it wouldn't stay in gear 3; the chain would go onto it, then fall onto gear 4, then go back ...