Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the June Giveaway for a brand new Merida Matts 6.5 bicycle


Bike not shifting properly
#1
hey i got a 21 speed MTB, my problem is that its not shifting very well in high gears

note - i got 3 crankset in front (right shifter side handle), and 7 cassette in back (left shifter on handlebar)

my problem is:

- when in in gear 2 in right shifter (front) , and try to go to gear 6 on the left shifter (back) the chains jumps and wobble around trying to shift to like 5th gear. when i go to gear 7 it wants to jump to gear 6.

- same thing happens if i go in gear 3 in right shifter (front) , it takes like 7-8 rotate to get from gear 2 to 3 in front (is that normal?), but same thing happens when i try to shift the left shifter from gear 6-7.

- it kinda hard to explain but that the best i can describe it.
  Reply
#2
Hi viet,
Check your chain wear by viewing this.... http://bikeride.com/chain-wear/ also there are links at the top of this thread that will help ya out. Smile
Good maintenance to your Bike, can make it like the wheels are, true and smooth!
  Reply
#3
thanks, oh yeah forgot to tell, i replaced my chain(chain snapped in half so i had to get a new one) . but it happened before and after i replaced the chain. do you think its the cassette or derailer?
  Reply
#4
Viet,

Most likely both the cassette and the front chainset. However you say it also happens on the largest chainring (Hmm...). In my experience replacing the chain also requires replacing the cassette and the middle chainring because they've worn together and the middle chainring is the most used. Maybe your outer (largest) chainring requires replacing too if you use it a lot...?

[EDIT] Does this not happen on the smallest chainring?
  Reply
#5
Worn cassette and front chainrings usually won't affect shifting too much though. At least not when you're putting light load on the pedals.

First things I'd check are just the normal shifter adjustments and make sure your rear derailleur isn't a little bent. That can happen when a chain breaks. But check all the adjustments before you start buying a lot of new parts.
  Reply
#6
oh ok, ill post some picture of my bike tomorrow or soon,
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
Merida Matts 6.5 Bicycle | June 2020
Today 01:37 PM
Clunk noise from front cogs
Today 01:00 PM
Just got my bike fixed up, looking for a...
Today 08:58 AM
Help me identify my vintage Bridgestone ...
Today 06:11 AM
Rust on the handlebar
Yesterday 10:41 AM
Bike front rim question replacement
Yesterday 08:29 AM
Bike brand “Perfect”
Yesterday 07:26 AM
BAGGI 1936(?)
Yesterday 03:33 AM
Pedals: Clip vs. Clipless
Yesterday 01:02 AM
first time biker
06-02-2020 07:42 PM

[-]
Top 5 Posters This Month
no avatar 1. Jesper
25 posts
no avatar 2. CharleyFarley
18 posts
no avatar 3. Painkiller
15 posts
no avatar 4. Joe_W
12 posts
no avatar 5. Sagan97
10 posts