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when i am riding very fast and combination is 2-4 then while pedaling suddenly it shifts to 5th gear but the shiter shows 4th gear it happens with 5-3 also then it suddenly shifts to 6 and same problem with 5-3 then to 7.please help me about this.and chain grinding sound is also produced.and derailleur is 7 speed.

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Comment by G Sharath Prasad on April 27, 2014 at 10:38am

your Derauiller needs adjustment in which it needs to be synchronized with the shifter. The main barrel adjuster  needs to be rotated clockwise or anti clockwise for the gear cable to be adjusted.   This is a simple no rags procedure that can be done yourself or take the help of a number of videos on You tube on rear derauiller adjustment.

Comment by Basab Chakrabarti on April 16, 2014 at 2:36pm

Hi Jack,

If your bike is only 3 months old, then what Vinni suggested is quite right. Only a little adjustment should solve the problem. When the rear wheel was removed for tube change, something may have disturbed the cable setting. Call me on 9731526622 if you need any further help.

Comment by Vinni B on April 16, 2014 at 1:02pm

If your gear shifts up then that means your gear cable is bit tight, Just take it to shop from where you got it from they will do the adjustment. All thats needed is a little bit of loosening of he rear gear cable. I wont advice you to do it urself as u could end up altering it completely. Just visit the bike shop from where you bought it from, they may not even charge you for this as its a very minor adjustment.

Comment by Jack Benjamin on April 16, 2014 at 12:13pm

It is shimano acera m360 7 speed,it is 3 months old,not changed derailleur parts, no adjustments made but the rear wheel was removed for tube change.

Comment by Basab Chakrabarti on April 15, 2014 at 6:03pm

To give you possible solutions please let me have the foll info : (1) What is the make and model ? (2) How old is it ? (3) Did you change any derailleur parts (4) Did you make any adjustments before this problem started ? Look forward to be of help.


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