520 is lighter then 530 if your getting both sprockets and a chain you can get any size you want but if your only getting 1 sprocket you will need to know what you have on your bike now..

most chains say on them what size they are

 

some sprockets also say it on them like if you have a 44 tooth sprocket with a 525 pitch it will say 45-525 on it but not all do just some

 

thx thx.... wat do u have how many teeth on ur sprocket? wat should i get 4 beginner i was thinkin like 54

 

i have a 62 520 tooth for the lots and stock for the streets

 

she'd ruin the picture because then I wouldn't be able to see the bike..