Rear Derailleur, hopping back and forth

[JOx2]

whenever im on my middle ring-smallest cog combo#(2 middle ring - smallest 9th gear) the chain hops back and forth on the 8th gear and 9th gear. so i shift it to middle ring - 5th gear and all is fine. This drives my crazy, what is going on, what can i do? i need your help.

thank you

[Pain Freak]

Sounds like a cable adjustment, or you could just buy a new bike....Yeah, that's it, buy a new bike. You know you want one.

[Pato]

Originally Posted by JOx2

whenever im on my middle ring-smallest cog combo#(2 middle ring - smallest 9th gear) the chain hops back and forth on the 8th gear and 9th gear. so i shift it to middle ring - 5th gear and all is fine. This drives my crazy, what is going on, what can i do? i need your help.

thank you

JOx2,

First off, try Pain Freak's suggestion first. I know this is a new bike so the cables may have stretched a bit.

Second, have you ever crashed or laid the bike down on the ride side? If this just started happening you might have bent the derailleur hanger.

Third, you shouldn't be in that gear combination to begin with. Every front ring has a group of five rear cogs it should be in use with. Big ring uses the 5 smallest rear cogs (5-9), middle ring uses the 5 middle cogs (3-7) and the small ring uses the 5 largest cogs (1-5). Everything else is just a duplicate gear ratio of those gear combos and is considered cross chaining and will wear out your drivetrain prematurely.

Duc

[RacinJason]

If you can get your bike to me I will tune it up for you and show you what I did and how to do it yours self. Once it is explained with detail it is really easy to under stand how to set up your drive train.

PM me.


J

[DISCO]

Your chain is too long, take a link out. IF it was Big/big than you would want to add a link. Is there any reason you don't use the big ring? cause you could just dump it and ride a bash.

[JOx2]

@DISCO, I use a bash guard and haven't reduced chain length since getting rid of the big ring. I noticed I havent been using the big ring, and is once scarred a couple of teeth on previous rides.

@RacinJason, i appreciate the offer, I will keep it in mind.

@Pato, i've fell on my right side once, hence my rear der skipping i mentioned to you before 3 weeks ago. I'll remember that ring-cog combo.

[kdog4130]

Your hanger is prob. wonky. Check it out form the rear of the bike to see if it's in line with the cogs, or frame.

[92se-r]

Shimano?

[RacinJason]

Wonky Great word for it.

[mechmann]

jojo...

if it is still acting up, and you show up thurs, i will fix it.

[jeffj]

Check the stop adjustment (one of the two small adjuster screws at the back of the derailleur). Looking from the back of the bike, look for the top pulley wheel on the derailleur to be directly in line with the smallest cog when it is shifted into the 9th gear position.

[JOx2]

Originally Posted by mechmann

jojo...

if it is still acting up, and you show up thurs, i will fix it.

see ya!

[Rawhead]

Start simple... check the chain for stretch. It may just need to be replaced.