Somewhere around 11,500 ...but there's some debate it actually gets there.
Just ride it......don't sweat the small stuff.
You'll know when you hit the rev limiter.
When that happens....shift.
by the way....don't you mean rpm ?
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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