There's all kinds of posts around this forum about gearing choices and who loves what.
Bottom line is pretty simple.
Most people hate stock gearing and love the change they make.
I've got 13/48 and it's the bees knees.
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2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs