The motor from the build is an electric power steering pump from a junkyard car. This gets mounted on a one-off rear bike rack and drives the rear tire with help from some gears from a pocket bike ...

The power-steering pump pressurizes the hydraulic fluid that helps the driver turn the steering wheel. Signs of steering-pump failure include leaks, noises or decreased assistance while steering.

General Motors has released a Service Update for certain units of the 2024-2025 Chevy Express van and 2025 Chevy Silverado HD pickup produced with power steering pumps that could fail prematurely.

but a general rule of thumb is to flush and replace the power steering fluid between about 40,000 and 80,000 miles. Leaving old or bad fluid in the system will make the pump work harder ...