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2
votes
1answer
47 views

Indexed rear derailer shifts two cogs for each step

I'm trying to troubleshoot poor shifting issues on a mountain bike that appears to have been built out of the spare parts box… The current problem is "instability" on the rear derailer – the chain ...
-1
votes
2answers
100 views

Rear derailleur mess up PLEASE HELP. Im helping a 64 year old cancer patient. Very important

The old man next door painted his bike today. He took the deraileur off the bike to do so but did not remove his chain. The chain does not have a master link and neither one of us can financially ...
1
vote
1answer
57 views

Shimano sora shifter no longer shifts

On my commute yesterday, I noticed that my right shifter was no longer 'clicking' when shifting my rear derailleur up into a larger sprocket. It still shifted fine, but I noted that I should look into ...
1
vote
1answer
74 views

Is it normal for a Derailleur pulley to “wobble” a little bit? Or does that mean it's time to replace

I'm trying to repair my bike for the first time, so i'm learning. It's a shimano deore set for a flat handle road bike. It won't stay in gear --- it keeps shifting while i ride, especially in the ...
1
vote
3answers
86 views

Can't downshift rear derailer

I'm trying to fix my wife's bicycle which sat out all winter. I can't get the rear derailer to downshift from the twist grip shifter. I have inspected and cleaned and lubricated the cables, nothing ...
1
vote
0answers
39 views

Sachs- Huret derailleur (re)installation

Sachs - Huret derailleur installation So the learning curve continues on the '85 Peugeot P-16. The main lessons are to take pictures and time getting each thing done. I have the rear derailleur ...
2
votes
1answer
30 views

Shimano sora 9 Speed rear derailleur capacity

It's 37T here http://bike.shimano.com/content/sac-bike/en/home/components11/road/sora1.html But 31T here http://www.wiggle.co.uk/shimano-sora-9-speed-rear-derailleur-1/#prodbullets Why is the ...
4
votes
2answers
437 views

Replace rear deraileur without breaking the chain

I currently have a Shimano Dura Ace 10 speed rear derailleur with a 12-25 cassette. For some hilly rides I'd like to change to a 12-30 cassette. The maximum the rear derailleur can handle is 28, so ...
0
votes
3answers
125 views

Why does my Rear bike tire slow down when Pedaling?

I just replaced a flat on my rear road-bike tire. I had also tried to replace the rear axle, By removing the axle completely, to a quick release lock but realized the axle that had been installed with ...
0
votes
2answers
88 views

Rear derailleur hitting chainstay (video in the post)

I filmed a little video of the process: https://youtu.be/ejJsIWrrFTU Does anyone know how to solve the problem? Apart from attaching piece of rubber to the chainstay? It is really annoying, because ...
2
votes
1answer
148 views

former weightlifter turned triathlete repeatedly breaking hanger

Every year, it seems I am on a training ride 5-10 miles from home and while torquing up, I snap the hanger throwing the rear derailleur into my spokes and locking up my rear wheel. I am 205lbs and ...
0
votes
1answer
95 views

Rear derailleur shifts all gears at once

I've got Campagnolo Veloce gear system and I recently changed my worn-out rear cassette to a new one. Since then I've experienced issues when shifting to higher gears. When I shift, the cable moves ...
1
vote
2answers
853 views

9-speed system to 11-speed drivetrain upgrade?

I am currently upgrading my bike from a 9 speed to an 11 speed system. I am currently using shimano 105 components and will continue to use them within the new system. Current bike has a shimano 105 ...
1
vote
1answer
67 views

Can any MTB rear derailleur be mounted to a Scott type 1 MTB derailleur hanger?

Can any Shimano MTB rear derailleur be mounted to a type 1 (206375) Scott derailleur hanger. I have a type 1 derailleur hanger with a Shimano STX rear derailleur mounted and like to mount a Shimano ...
3
votes
1answer
121 views

Using PTFE spray on rear derailleur springs

Have noticed that the rear derailleur springs and pulleys are picking up lots of road gunk. I use a wax for the chain and as this breaks off I can see it getting stuck on the pulleys. So after ...
2
votes
2answers
114 views

Rear derailleur cable housing length

I've cut my first cable housing using this ParkTool page as a guide. The thing is, I think it's a bit too long. Can I safely shorten it or the length is good as it is now? Update: 7.5cm less, is it ...
3
votes
2answers
195 views

How to prevent shifting issues due to derailleur or cables freezing in cold weather

It's been fluctating in temperature between 0F and 20F in my area. I've been riding my 1x9 geared mountain bike to and from work. However, due to the cold weather, I'm having issues shifting. It ...
0
votes
1answer
85 views

Did i buy the wrong derailleur? (mech hanger/direct to frame)

I'm a total newbie with bike repair and I can't figure out this hanger/direct to frame business. Googling doesn't help much. Here is a picture of the current derailleur and the new one I bought. The ...
0
votes
3answers
109 views

Rear shifting - Unable to shift to toughest gear

I was adjusting my rear shifting following the advice in this video: ...
0
votes
1answer
138 views

What causes the rear hanger to snap off?

I have a Specialized Allez Elite road bike, purchased brand new in June this year. So far I've covered around 300 miles in total on it. During my ride yesterday, as I was going up a slight hill, I ...
0
votes
2answers
272 views

SRAM X4 MTB Rear Derailleur H-Limit screw maximum open, but still on 7th Cog?

I own a 6 months old Rockrider 5.2 mountain bike. Everything was great until recently I noticed that the Rear Derailleur of my bike doesn't reach the highest gear cog, which is 8th. Its always stuck ...
0
votes
1answer
375 views

Are new Shimano shifters compatible with old 600 Arabesque derailleurs?

Does anyone know if I can use new gear shifters, especially integrated road bike shifters, with vintage a Shimano 600 Arabesque rear derailleur? Will the pull ratio of the shifter and derailleur ...
-1
votes
1answer
97 views

Adjust Rear Derailleur

10 speed Ultegra CS 6600. When I march up and down the gears on the stand it shifts fine. If I test it on the road and march up down the gears it shifts fine. But on a ride if I have been coasting ...
1
vote
2answers
595 views

Realign the cassette gears after removing the rear wheel

I took out my wheel for a puncture and when the wheel went back on the bike the gears were out of line, a lot of skipping and jumping. What is the best way to get them back in alignment (must be ...
3
votes
2answers
144 views

Derailleur hanger moves when tightening quick release

I have an old Trek T-900 tandem that my wife and I ride quite a bit. It's got an 8-speed rear setup. It's a standard (tandem) 145mm rear-spacing with matching hub, but tightening down the ...
3
votes
3answers
760 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 ...
3
votes
1answer
158 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 ...
1
vote
3answers
200 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
141 views

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

Is there an easy, objective way to tell?
0
votes
0answers
290 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
10k 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
1answer
151 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
2k 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
182 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
272 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
38 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
513 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
592 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
844 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 ...
3
votes
3answers
1k 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
907 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
5k 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
334 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
184 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
296 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
315 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
448 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
793 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
140 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 ...
3
votes
2answers
162 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 ...