Segway PT x2 Reference Manual page 117

3. Rotate the Powerbase until the valve stem on the inside of the
Wheel becomes visible.
4. Check the Tire inflation pressure.
The valve stem is visible on the x2. You do not need to tip the x2 on
its side to check or adjust Tire inflation pressure.
Inflate Tires to the correct pressure, as stated in the "Segway
Specifications" on page 5. Overinflating or under inflating Tires
can increase your risk of traction loss, resulting in injury and
falls.
For more information, see "Tire Inflation Pressure"
on page 5.
NOTE:
WARNING!
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