What's the difference between 520 and 525?...sorry, newbie question.

 

Chain size, the 525 is larger and stronger, it is what the F4i come stock with, how ever the 520 chains work as well and are claimed to be lighter and there for faster....in a simple way of explaining it.

 

Thanks that helps. So, I assume that you'll still get the extra torque with the unspring weight...with -1+2 then, but still have some characteristics of being stock?

 

a +1,-2 is off by 20% so it isnt a set mph

 

Yeah, you get the same ratio but the 520 chain is lighter....is it something most of us will notice on the street....i doubt it...maybe wear wise tho the 525 chain could last longer....but it is also a little more money so....had my bike not come with a 520 on it, I would have stuck with the 525

 

I just got mine done this weekend. D.I.D. chain and driven sprokets from sprocket center. I couldn't push it hard the front brakes aren't done yet should be done today but it is awesome, makes a big difference. I went -1/+2 520. I am glad I did.

 

so if the speedo is off by 20% then the odometer would be off by 20% too, right?
which means im gettin alot less miles per tank than i thought... whcih sux. lol

 

your MGP has to do with the increased RPMs after the gearing change. the % error on the speedo has nothing to do with it...cruising down the highway at 65ish the RPMs are only a few hundred higher...I dont think the change will dramatically affect miles per gallon...I personally ride my bike for fun with a heavy throttle. I do no commuting so this is not a concern to me

 

yea but if the speedo is off, thenwouldnt my odometer be off?

and if my odometer is off, then i really got less miles on my tank of gas than the odometer says. thats what i meant, i didnt mean the speedometer caused me to get less mpg i just meant that i got less miles than the odometer says

 

my bad, I thought you meant miles per gallon...you are right, the odometer will rackup the miles faster than what you actually have, meaning it will seem that you get more miles to the tank than you actually do