Originally Posted by
xodondum
Chain suck!!! that's definitely it! It's only recently that I got into multi-geared bikes so it's new to me. Should I file that "split" tooth on 1st gear and try it again? or just take it to a shop & get their opinion? the odd 2nd gear teeth may be normal as I saw others that looked like it. also there seems to be a lot of slack in the chain, should I take out a link or two?
It is more likely that the chain suck is happening on your middle ring, not the small one
Remove chain links only if you are sure that after they have been removed you can still switch gears to the largest rear cog while your chain is on the big ring in front without destroying your rear derailleur. If you remove links from a properly sized chain you are asking for trouble