besides the minimal freeplay.. is it okay to slap on the 525 chain on 520 sprockets? reason is because i need new sprockets n chains bad! n i already got a thrust 14t and 45t. but now i only have 40 bucks left for a chain and my friend is going to give me his 525 chain.. what do u think?

 

Get a 520 chain.

 

will do. i found a standard RK chain at Cycle Gear for only 30 bucks..