I just swapped to 15/43 as well. I used the stock chain since it's still in great shape.
Pulls harder everywhere and Cruise RPM's are still low in 6th gear at 75. 6th is insanely tall.
The speedo is driven off the rear wheel speed sensor not trans speed. so Gearing has zero effect on the speedo. which is pretty bad ass.
My speedo is still dead on by GPS on my phone.
Now that I've hit 190 lol, soon as my stock chain and sprockets are worn out I'll be going to the 15/43 supersprox.....anyone have thoughts on whether switching to a 525 or 520 are worth it or nah if you arent racing?
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