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Its been 1 month since I have bought my new MTB (Kross globate 1.1) with 18 gears (shimano).. Now the problem is chain has slipped twice while riding. First time my speed was around 25kph and second time it was low around 15kph.

And another point to notice is that my gears are not working properly... chain does not move to other sprocket when I change my gear from rear 6 to rear 5 or vice versa, they start changing afterwards...

What could be the problem?

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4  
Your shifter needs adjustment. This is normal for a new bike as the cables stretch out a bit and everything "breaks in". If you bought the bike at a legitimate bike shop they should give you a free tuneup. –  Daniel R Hicks Jun 5 at 2:44
    
Seems to have tourney shifters and what not. –  Batman Jun 5 at 3:53
1  
@DanielRHicks that's an answer. This has to be a duplicate... search gears jumping new bike... slipping some gears or maybe gear shift adjustment but perhaps it's time to expand that a little and fix the title here? –  Mσᶎ Jun 5 at 5:39

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