Have you checked the hanger? Loose freehub?

 

Have you checked the hanger?

I replaced that with the derailleur.

 

do you just mean it's slow shifting? could be as simple as turning your barrel-adjuster counter-clockwise. i'd start with the free stuff like that. other times, shifting problems can be traced to old cables and binding in the cable housings.

edit: just saw you mentioned cables/housing already.

 

on the other hand, if it's skipping while in a gear, it could very well be the cog's worn out. i had a chain skipping over a cog while under load last year. replaced the cog and that went away. if you ride a lot in the top three largest, good chance with 800-900 miles they're wearing, especially if you spend the lion's share of riding in those..and if you're a masher more than spinner.

 

Are you sure you have your derailleur limit screws set correctly, and that your chain is the correct length? How do you know they are correct? Do you have your b-screw set correctly also? How do you know it is correct?

It is almost 100% user error based on my best guess.

Also, your thread title is incorrect. High gear is used when going fast, low gear is used when going slow, or up hills.

 

You may be correct, Jon. I adjusted the limit & b screws and most importantly put on new cable and housing. Everything seems good in the stand. Will ride Friday and find out.

The bike (Rocky Mountain Instinct 950) in about 6 months old and I may be learning that the cable and housing for whatever reason seems to wear out more quickly than previous bikes. Though this my first clutch derailleur and maybe that has something to do with it. I also suspect the cables may have gotten twisted around each other in the internal routing.

The cassette does show some minor signs of wear but not much. I did file off a little burr from one tooth .

Also, your thread title is incorrect. High gear is used when going fast, low gear is used when going slow, or up hills.

I always get those mixed up.

Thanks for the help

 

I'd go with checking the rear hanger. Seems like newer drivetrains are very sensitive to hanger alignment.

Once you have the tool, it takes about three minutes.