The new gearing is great. Since this is a street bike for me, I made the change for low/moderate speed rideability. No idea on top speed for the same reason.
A 520 conversion requires a new chain since the original one is 525. You can obviously keep a 525 chain and make the gearing change too, but changing to a quick-swap rear make subsequent changes a lot less work.
Im using 15 /38 don't forget to reteach the gearing to the bike, check swing arm angle, as there not good out of the box I made new dogbones 136mm to get the 12.7 deg reqd for racing, things change when you go bigger rear sprocket, you get more pro squat! not good, you want antisquat, if you don't understand look up traction dynamics on youtube an youll see for your self
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