so, now that my chain on a 05 f4i looks to be worn...

im in need of changing it. i hear it's best to change sprockets too...

the bike has 25k's. is chain/sprocket replacement needed?

also, i hear of 520, 525 and etc for chain/sprocket type.

what's best choice for (sport) street riding?

DID x-ring chain's how are they rated in the market?

also, what are your thoughts on the below....
http://cgi.ebay.ca/RK-Chain-Sprocket...#ht_2441wt_911

thanks...

 

D.I.D X-ring is top notch, the only chain I use.

From what I know, 25k is about right for replacing chain/sprockets.

If you're on a budget staying with 525(stock) is best for longevity.

520 is lighter which translates to increased performance but isn't incredibly apparent.

Check out sprocketcenter.com for complete ready-to-install kits.