Crappy gear changes
 

Ηello everyone ,my bike is a rossignol mtb from 96' or 97' (i think) i cleaned my bottom bracket replaced bearings
bought new freewheel ,chain,crankset and adjusted my derailleurs.My back derailleur is serving me well is not that fast but it get the job done ,but the front gears are so terrible, the chain go the chainring that i selected so slow or even dont change at all and because it has twist shifters i look like a ****** trying to get the correct chainring .What is the problem i almost changed everything and the problem is still there.

Learn technique and timing and terrain reading and friction shifters work reliably well. (toss the grip shifters for friction thumb-shifters)

or maybe you have envy of the higher tech indexed shifting that reduces the skill -i nvolvement - participation.

there have been engineers working on that for decades now.

maybe time for a new bicycle?



....

Well one constant is the rider... Andy

I dont want spend alot of money now on a new bike, if i buy a new bike it would be a hardtail that costs atleast 600-800euros and i dont have that kind of money right now, bying a cheap "new" bike that has the same components or little better than mine now doesnt make any sense to my pocket.So you are telling that the shifters are the problem?

Perhaps some more details about the shifting problems.

Upshifting? Downshifting? Small, Middle, Large chainring?

Shifter? Derailleur model? Photos?

I worked on an older cheap Shimano MTB derailleur a while ago. It tended to trap the chain when upshifting from the middle to the big ring. The solution was to move the derailleur up enough that most of the shifting was with the flat part of the derailleur.

A bent derailleur cage can also cause problems, and might be able to be straightened if done with care.

Look carefully at the derailleur cables and cable housings. New slick derailleur housing might be helpful.

twist grips... freewheel... low end bike...

the crank/chain rings are riveted together, right? they are low end parts, and may not shift easily, no matter what you try.

watch a youtube video on front derailleur adjustment... do what it says to do.... alignment, adjusting the clearance between the der. cage and large chain ring... adjust cable correctly, then set the limit screws correctly.

OR... buy a newer, better crank set if the adjustments don't help. Modern designs use a system of ramps and pins to LIFT the chain onto the larger sprocket when you shift...

I don't see a mention of shift cables. I struggled for the past year with my front shifting on my road bike. Constantly fiddling and adjusting. Finally quit shifting at all. I replaced the front shift cable and OH MY!

Changing my cables was the first thing i have done, but i didnt changed the housings i used the old ones and put some light grease inside them. Could this be a problem?Also i didnt mention that my front derailleur is a from the low end tourney series.Sorry for the late response.

I could train a chimpanzee to tune a rear derailleur but front derailleurs can be tricky.

My advice is to go to the Park tool website. You should be able to find a set of step-by-step instructions for installing a front derailleur. Since you've obviously been struggling with it for awhile, assume that everything is screwed up. Disconnect the shift cable from the derailleur and pretend that you are installing it for the first time.

Step 1 has to do with the position of the derailleur on the seat tube. Before doing anything else, make sure that's as perfect as you can get it. My experience has been that whenever I've had a lot of trouble adjusting a front derailleur, the ultimate problem was the position of the derailleur on the seat tube.

Follow the rest of the steps IN ORDER because each adjustment affects the subsequent adjustments.

Good luck! The good news is that after you get it right, you will have the sense of accomplishment at having figured it out yourself.

Well it COULD be a problem but if you pulled out the old cable and the new one slid in easily and slides freely then there's no reason to believe that is the problem.

^^That. As mentioned I struggled with my front finally switching to a different. Still I'm regularly fiddling with adjustments every few rides to keep everything shifting smoothly. I've never touched my back derailleur, never needed to. But I agree with Retro Grouch, sometimes it's best to unhook the cable, back off the screws and start from square one.

No i didnt had any problems putting the new cables in,thank you guys for your responses i will try the guide for the front derailleur as soon as possible and update.

+1

Sometimes you need to raise the front derailleur to get it to work right. This is especially important if you changed chainring size. If you went from a 46t to a 42t large ring, (really necessary if you drop a chainring and just run middle/small), the front derailleur may not want to shift up if you set it at 2mm. I've raised a FD till I found a sweet spot. It does make it infinitely easier if you have a bike stand.

John