Indicated Speed vs. RPM ?

I'd be interested to learn what others are getting for Speedometer vs. RPM. readings. At 120KPH my tach reads 4000RPM in 5th gear. I have a 240KPH speedometer and running on stock-size tires with ample tread.

At 4000 rpm on my bike, I'm travelling at 108kph GPS Indicated Speed - 115kph speedometer indicated speed also stock tyres and good to
fair tread