Went to tighten chain on bike today doing some overall maintenance. Chain felt pretty loose. Started adjusting it and it was where i wanted it. Spun wheel and damn it gets to a certain spot that is tight as hell. This is defiantly time for a new chain correct or could this be the sprockets? Looked over everything and the only thing i can think is the chain is shot. Is that defiantly what it is a bad chain or should i be looking elsewhere? I have to leave the chain loose now because if i leave it tight and it gets to the tight spot it will barely move.