Originally Posted by
FBinNY
For what it's worth, I think we're approaching this wrong. the OP has opened 2 threads on the subject and is getting a bunch of opinions piecemeal without getting an overall sense of his problem.
I think it would be best for the OP, if he take a break, and review a number of
tutorials about rear derailleur installation (link to over a dozen), so he can see the big picture and narrow the range of his problems (if any besides adjustments). Once he's close and can identify one or two specific remaining issues, then maybe we can help.
Yes.
As I suggested in one of the other threads, new derailleurs may not be needed. Probably an adjustment problem.
avtandil , please take the time to read the Park tool site, AND better describe the problem.
Here is a glossary to help you use the correct terms. There may be a better glossary, I just did a quick search.
http://www.performancebike.com/bikes...1_BikeGlossary
Also, I count 8 cogs on your cassette. Is that correct ? If you have a 9-speed shifter on your handlebars, then you will not get good shifting. A bike with indexed shifters (most modern bikes like yours) needs to have matching/compatible parts. If you have 8 cogs, then you need the same brand shifter with 8 positions (7 "clicks" plus 1 starting position). You also need an 8-speed chain that is the right width for the cassette cogs.
Since 9 and 10 speed systems squeeze more cogs into the same space, they all have different dimensions and all need to work together as designed. They use narrower chains, and closer spaced "clicks" on the shifters.
Originally Posted by
avtandil
good advice...... thank you....i have just one concern that moves me...will my gear take to my trip safely.....even if i fix them? or i have to change them...i checked some tutorials how to install and adjust Dérailleur but i found that these two screws ( that u move Dérailleur left to right are not working properly) so is it worth to fix it?
Once they are adjusted properly, then they should be fine for your trip.
The 2 screws that I THINK you are referring to are called "Limit Screws". They don't "do" anything while riding or shifting. One prevents the derailleur from overshifting the largest cog into the spokes and breaking everything. The other prevents overshifting the derailleur past the small cog into the frame's dropout. Once your bike is set-up correctly, you should never need to adjust the limit screws (unless installing a different wheel or new derailleur)