i think my bike needs a new chain,the chain is kind of kinking.i lube it regular bases.what does the 120, does that mean 120 links,right now my chain is a 110,my gearing are front 13t and the rear is a 50t.if i want to uuse the same gearing but move the tire further back,could i get the 120 chain and cut it to fit,after moving the tire further back.

 

just get a 110 link chain