The E-gyro in an AR Racing international patent. It is placed in the rear wheel and is composed by an ESC and a B/L motor. the fixed part of the B/L motor (Stator) is anchored to the shaft while the mobile part (Rotor) is pressed into the flywheel.
It has 3 main important features:
o The E-gyro runs at a constant speed even when the bike runs at low speed. Therefore the stability is obtained both at fast and low speed.
o the second is that when you pull the trigger all the power from the motor is used to speed up the bike and not the gyro, you can even drive a 50% longer gear ratio!
o the third is that, being this gyro more efficient, you will exoerience longer runtime.
The B / L  motor is an outrunner, 1.050KV. The rpm of the flywhell depends on the voltage of the battery used (NiMh 7.2, 7.4 Lipo,
Lipo 11.1). The flywheel weighs 260gr. The ESC, that controls the gyro, is inside the rear wheel and is powered through the rear fork arms which act as conductor, wireless therefore.
This allows to remove the rear wheel w/o detaching any plug or wire and for a clean and efficient maintenance.
The rpm of the motor are constant and are not adjustable. A a speed limiter is being developed, available in the future, to limit the rpm when using the 11.1 lipo battery.

Down here you can see some pictures related to the internal part of a wheel with the E-gyro

Read the review on RRCi