520 get steel/titanium sprockets or you are going to eat the sprocket teeth off eventually. May be from aggressive throttle but I will never use aluminum sprockets again.

520 is lighter than 525 in weight

 

you wont notice the difference on the street is what ive collected from info on here

 

520 is lighter and less mass than 525. the pro of the 520 is less rotating mass. downside of 520 is that it has less life compared to 525.

For street use just stick to 525 as you will not see any noticable difference between the 2. If you are doing track or want to do performance mods to your bike (and don't mind replacing them more often) then go 520conversion with steel sprockets. Stay away from aluminum.

 

520 sounds cool in the list of mods in your sig!!!

 

^^^ Love this ^^^

If you get a 520 set up you save weight on the chain but need a steel rear sprocket to take the beating.

Keep your 525 set up and you can run an aluminum rear sprocket which is lighter then the factory steel sprocket.

Run a 520 set up with titanium sprockets and you'll get the best of both worlds but your wallet will hurt alil.

For a street rider and even a NON-expert track rider the benefits are slim and should be spent elsewhere at first. Tires, damper, exhaust, Power commander,etc. I powder coated everything texture low gloss black to match the frame, so I picked up a +2 525 black vortex aluminum rear sprocket and a 525 gold on gold EK chain to match the factory gold calipers and scotts damper. 10,000 miles later and all is still well. Good luck.

 

^this guy haha

 

i got 530.. I'm not that cool

 

520 is lighter but won't last as long.

 

well i'm replacing stock chain after 7000 miles. replacing sprockets too even tho stock ones look fine. thanks for the info i'm probably gonna stick with the 525 and steel sprockets.

 

i have my 520 Driven kit uninstalled, ya making me feel like i should go back and buy 525 now.

 

^ i also have the 520 Driven kit uninstalled, theres tones of guys who have this kit w out incident, as mentioned just be sure you have steel sprockets. i also rec getting a speedo healer as well. Im super excited to slap this kit on

 

mine is steel in front and alum in rear..and i have it in stock gearings, so no need for a speedo

 

Whats the difference in steel and alum as far as longevity?

 

Steel harder than aluminum

 

Whether its steel or aluminum, proper maintenance will prolong the life of either material