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2
votes
2answers
62 views

Rear index shifting not staying in middle gears

I have replaced a chain (SRAM PC 830) and 7 speed freewheel (Shimano MF-HG37) on the back of my daily commuter bike about 300 miles/ 3 weeks ago with the same models. The old parts lasted me 4000 ...
2
votes
1answer
36 views

Misadjusted B-screw: symptoms?

What are the typical symptoms of incorrectly adjusted B-screw in the rear derailleur? How does it manifest itself when shifting? Obviously, if the cage pulley interferes with the cog, the problem is ...
0
votes
0answers
49 views

Shimano 105 Adjustment [on hold]

I have done quite a stack of research on this and downloaded all the Shimano tech docs prior to starting the job. At this point in time, I am going to make some assumptions. The main assumption is ...
1
vote
2answers
50 views

Suitable rear mech for Megarange cassettes

I just bought an 11-34T 8 speed rear cassette and noticed that it is a Megarange cassette with a substantially large jump between the lowest and 2nd gears. Will this work with my existing Alivio ...
0
votes
1answer
50 views

Is this a short cage or long cage rear derailleur? [duplicate]

Is there an easy, objective way to tell?
0
votes
0answers
53 views

Shimano Tiagra Rear Derailleur - Barrel Adjuster Won't Screw In

My rear derailleur barrel adjuster has unscrewed completely and now I can't get it back in. Is it likely that I've damaged something here, or is there some special technique to screw in barrel ...
5
votes
3answers
180 views

How can you identify if a Shimano rear derailleur is medium or long cage?

I have a 2013 Shimano XT rear derailleur. It is part of a 2x10 drivetrain. How can I find out if it is a medium or a long cage one? The picture below shows the derailleur.
1
vote
0answers
44 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 ...
2
votes
3answers
110 views

Rear wheel rubs frame after tire change

I recently changed the rear tire and paid no attention to the original working state of the rear derailleur. After a miserable attempt at resembling, I lost what I now think was the Derailleur bolt ...
1
vote
1answer
85 views

Chain Slipping?

I am not the most knowledgeable when it comes to bikes so please bear with me. I have a Claud Butler and after fixing a puncture I decided to ride it. As I was riding, I could hear a sort of rattling ...
0
votes
1answer
131 views

What exactly happened to my rear derailleur?

I had installed my front derailleur and was adjusting the high/low when I noticed my rear derailleur was hitting the spokes of my wheel. Suddenly, I saw a screw pop out and then my derailleur popped ...
0
votes
1answer
24 views

difference in rear hub widths?

I've recently upgraded my road wheel set on my cross bike to a set of hope hoops which came with hope mono rs hubs. At first they required me to adjust the rear dérailleur so that the shifting was ...
0
votes
1answer
179 views

shimano 14-34t megarange casette not shifting to first gear

I bought a new deraluier and it wont shift to the first aka largest aka closest to the wheel / dropouts gear its about two inches too high. So it (the deraulier) knocks into the largest easiest cog. ...
1
vote
1answer
252 views

Can you take apart rear derailleurs, and how do you put them back together again?

I recently took apart my rear derailleur as it was on a 10 year old bike and really old and stiff. So I thought I would unscrew both jockey wheels and clean them, they had a silver bit either side, ...
3
votes
2answers
162 views

When to replace rear derailleurs

What is the typical life cycle of mid-range rear derailleurs assuming no accidents? More precisely, what's the average mileage after which it's better to replace it rather than doing tuning all the ...
2
votes
3answers
224 views

Why doesn't Shimano use shadow technology on road derailleurs?

Shimano has been using their 'Shadow' technology on their high-end mountain bike rear derailleurs (> Deore) for many years. In addition to the benefit described in the images below (from here), ...
5
votes
3answers
731 views

Has a bike been made with a rear derailleur above the chainstays?

The question title pretty much sums it up, but has a bike with an alternate drivetrain style like this been made? This would mean a derailleur mounted essentially upside down with the tension pushing ...
0
votes
2answers
539 views

What do I need to know about fitting new wheels on a bike?

My girlfriend has had the wheels stolen from her bike. I'd like to replace them, but we're working with a limited budget so I'm going to do the work myself and source the parts second hand. I've done ...
2
votes
2answers
127 views

Rear mech cage stuck, how can I take it apart?

This is a shimano ultegra 6700 rear mech. The swing arm/cage is incredibly stiff where it connects to the derailleur. I can just about rotate (red arrows) it a small amount but requires a lot of ...
1
vote
1answer
112 views

How can I stop my shifters slipping when climbing?

I'm having trouble with my rear mech and/or shifters. Under heavy load (say, when climbing) the rear mech is slipping. The two photos below show my shifters before and after a climb. I've not touched ...
1
vote
1answer
120 views

Can I change the rear cassette on a folding bike?

I currently have a folding bike (think Dahon like) with 20" wheels and a front chainring of 52T and a rear cassette of 14-24T. Although 14 provides me with good speed I'd love to get faster speed for ...
1
vote
1answer
200 views

derailleur P-screw/B-screw does absolutely nothing

I know dérailleur adjustments are frustrating, but this is the 4th day i'm working on this... i stop working just before the rage kicks in and leave everything to continue another day :) The problem ...
2
votes
1answer
200 views

Can I use friction shifters with a clutch style rear derailleur?

Can I use friction shifters with a clutch style rear derailleur like the 2014 Shimano Deore M615 Shadow Plus? Or does this put extra tension on the shift cable that will cause slips with a friction ...
4
votes
1answer
335 views

Derailleur guard on road bikes?

I live in an area with lots of debris, dodgy paving, and rain, and to make matters worse, I fall down sometimes (I know!). The main things that get damaged, of course, are the brake handles and the ...
2
votes
1answer
102 views

Chain overshoots cog when shifting from low to high gears

Hi when shifting from low to high gears my chain is overshooting the cog and jumping into the next one. I tried turning the low limit screw outward to move the derailer in towards the low gears but it ...
2
votes
1answer
87 views

Derailleur twitching in low gears

I had a mild spill today on my new bike, which put the (Tiagra) derailleur cage a little bit out of line. With some bending and eyeballing, I got the two jockey wheels lined up 'almost' perfectly ...
1
vote
1answer
37 views

Rear Derailleur compatability?

I am replacing a broken Shimano RD-2200, and trying to find the right part. How do I determine compatability? The largest sprocket is 26 tooth, and the cassette is 8 speed. Will anything by ...
2
votes
1answer
99 views

Derailleur problems - rear mech slipping forward

I have been riding my Trek Fuel Ex 8 for a few years now, and as I have improved, I have been attacking more challenging terrain. I have started to notice a problem in my rear mech - the link arm ...
2
votes
2answers
135 views

Chain Slippage on MTB

This is my first time posting on this site so bear with me. I've got a 2009 Fuji Tahoe Comp 29er MTB with upgraded SRAM x.7 components and I'm having a couple issues. It is currently set up as a 1x9 ...
6
votes
3answers
904 views

Is my derailleur hanger too bent?

I bent the derailleur hanger on my 9spd cassetted Bianchi Volpe about 1.5 yrs ago, and I just did it again, but worse. This time the derailleur got sucked into the wheel and really did a doozy with ...
4
votes
2answers
2k views

What's a good, reliable mountain bike drivetrain (1x10?)

I'm thinking about switching my Salsa El Mariachi 29er mountain bike from singlespeed to gears. I love the reliability and simplicity of the singlespeed, but I've been doing more rides that involve ...
2
votes
4answers
172 views

How often should I check rear derailleur adjustments?

If I remove the (rattling)plastic disc - How often should I check the limit screws on rear derailleur? If the shifter cable tension is less than optimal, would this be a possible cause to drive ...
5
votes
4answers
2k views

Can the Tensioner Spring go Bad on a Rear Derailleur?

My bike chain has been "skipping", so I've gone through the obvious: I replaced the chain I replaced the smallest cassette cog, which was showing significant wear After my replacements I noticed ...
4
votes
1answer
982 views

How do I tell if jockey wheels need overhaul or replacement?

I am refurbishing a bike and am deciding how much to clean out the rear derailleur. It's in pretty good shape. But after I take off the chain, I tried spinning the jockey wheels with my fingers ...
3
votes
1answer
387 views

Can't change into the largest sprocket on rear derailleur

I bought my first road bike recently, and I've noticed I can't change into the largest cog/sprocket on the rear derailleur because when I pull the shifter the chain is pushed into the side of the ...
2
votes
1answer
1k views

Cant get my rear derailleur to reach all cogs

I have been having an issue on my road bike getting the rear derailleur to reach all of my cogs. I can either not reach my two smallest cogs or two largest cogs depending on the cable tension. I ...
3
votes
1answer
361 views

Should I remove the chain before installing new rear derailleur?

I want to put a new Sram X7 instead of killed one, should I open the chain (if I have no chain lock) or it's better to open the derailleur?
3
votes
1answer
342 views

Rear derailleur hits spokes when switching to largest sprocket

I accidentally ran a bungee strap through my old rear deraileur and it tore it apart. I have fitted an identical replacement but cannot work out how to adjust it so that the tension pulley does not ...
4
votes
1answer
224 views

Rear Derailleur Curled Up

I recently bought a bike for the first time in 10 years and after riding it for a couple of days the rear derailleur curled up like an insect ready to die. Is there any way I could fix that or am I ...
3
votes
1answer
2k 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
2answers
692 views

What Shimano jockey wheels are compatible with my old Shimano 105 9-Speed Derailleur?

I'm in the process of getting my Cannondale CAAD serviced, which I reckon is from about 2006 (I got it second hand). I have had the rear cassette and chain replaced, like for like, but the bike shop ...
0
votes
2answers
161 views

Conversion question

Can anyone help find some literature or some pictures of a 2 speed conversion which has worked? I ride a huge gear, but plan to bike cross country, and I want to put my smaller chain ring back on my ...
1
vote
3answers
202 views

Refitting Cable to Rear Derailleur

Whilst riding recently the cable slipped from the clamp on the rear derailleur. I'm attempting to affect repairs by re-clamping the cable. However by pulling the cable tight I have lost the bottom 2 ...