4iiii - Dual Side Precision Pro Ultegra R8000 Power Meter Cross Country It's a great fit for

It's a great fit for kids aged 4-5

4 bikes when used with HoldUp EVO +2(sold separately)

IsoSpeed comfort technology helps soak up jarring road vibrations

for the ultimate control

4iiii - Dual Side Precision Pro Ultegra R8000 Power Meter Cross Country It's a great fit forRidden by the pros, the PRECISION PRO dual side power meters deliver all the benefits of 4iiii's left side model (exceptional accuracy, lightweight design, ANT+ and Bluetooth compatibility, 3D power meter technology), plus a specific breakdown of left and right wattage. Perfect for those who need specific power output from each crank side, or anyone who simply wants the best power meter on the market. 3D power meter technology (patent pending)