Gears jumping (video)

supermurph09

Hi, I was doing a hill climb event on Sunday, did my warm up on turbo, no problems at all. Set off on short hill climb, everything was fine in big ring, switched into small ring and then my gears were jumping all over the place, every time I pedalled it was just jumping and no continuos power would transfer.

Put the bike on the turbo last night, hoping the problem had magically healed over night, it hadn't. From the start it was click click click from the rear derailleur and then it started jumping. The chain appeared to be flick ing up on down on the rear cogs, engaging, jumping out, engaging, jumping, the same as on the hill climb. This was on the big ring.

So tonight I did this video http://youtu.be/ZdkiSZzYZrE . Is it usual for the pedals to want to keep turning once you stop or could this be related?

Rear derailleur shot, http://youtu.be/Oa9lCN7hsHU you can hear the clicking and the jockey wheels seeming to jump around a little bit.

Any ideas?
Thanks

dennisn

Rear D out of adjustment

supermurph09

Easy fix?

dennisn

Supermurph09 wrote:

Easy fix?

Easy fix? Depends on your experience level. Don't take this wrong but because you asked what the fix was I assume you're a newbie to maintainance. Check youtube for videos, have a mechanic look at it, go online and look at manufacturer's installation instructions. All the above wil help you more than myself offering a brief run through of how to do it. Plus you'll find out a whole bunch more useful info about drivetrains.

supermurph09

No offence taken, I'm a complete maintenance novice. I'll take it to bike shop and get them to show me what they have done as it sounds a but more complex than turning a screw. Cheers

davem399

Does the clicking occur once per complete circuit of the chain as I am wondering if it is a stiff chain link?

supermurph09

Dave, I would say that it does click as you suggest. The drivetrain is well maintained, just not good with fixing stuff!

johnmiosh

Patrick

I agree with DaveM399. It looks like there is a regular click on the jockey wheel once per chain revolution. Stiff link, or if you shipped the chain at any point could have twisted it slightly. This would have the effect of slipping, particularly on the smaller end of the cassette.

slowbike

easy way to find out is to turn the pedal slowly whilst examining the chain going over the cassette from the rear - you can then see if it's catching on the next sprocket or a link that's a bit stiff.

The Videos don't show that much detail as they're not high enough resolution and the area is a bit dark - but just how clean is your chain? Do you remove it to clean it? Do you use a quicklink?

supermurph09

Well, there was an issue with the chain that was causing the jumping on the smaller end of the cassette. New chain purchased. Sadly it would appear that the faulty chain may have been the cause of cogs 9 & 10 on both cassettes getting bent! What a nightmare, oh and just to top it off the hub on the easton wheel is dying.

Can you buy cogs on their own?