Builder's Guide
Instrumentation (E-Meters)
Last Updated: March 30, 2026You cannot win if you don’t know how much power you are using. Digital E-Meters are preferred over analog gauges because they are precise, easier to read while bouncing, and record total amp-hours used. Meters must be connected to a “shunt” to measure current flow.+2
Wheels, Tires, & Pods
Last Updated: March 30, 2026Larger wheels have less rolling resistance, while smaller wheels have less wind drag and higher cornering strength. High tire pressure is the biggest factor in reducing rolling resistance. Use “Wheel Pods” or spats to cover exposed wheels and reduce air turbulence.+3
Drive Train & Gearing
Last Updated: March 30, 2026Most teams use a direct chain or belt drive adapted to a bicycle hub. Alignment and tension are critical: a chain that is too loose will pop off in turns, while one that is too tight can cause a 5% power loss. Gearing must be tuned for specific tracks—keep a selection of sprockets or pulleys...
Suspension Systems
Last Updated: March 30, 2026Suspension is an advanced project that improves ride quality but adds complexity. Three-wheeled vehicles naturally keep all wheels on the ground, whereas four-wheeled vehicles require suspension to reduce chassis stress. Simple rubber blocks can be used to reduce vibration.+4
Steering Geometry & Rod Ends
Last Updated: March 30, 2026Proper geometry reduces tire scrub and rolling resistance. Use Spherical Rod End Bearings (Heim Joints) for linkages, as they allow for swivel and length adjustment. For cycle cars, the Ackermann Angle is essential: the tie rod pivot should be on the line between the kingpin and the center of the rear wheel so front tires...
Stability & Center of Gravity
Last Updated: March 30, 2026To prevent flipping during tight cornering, keep the center of gravity below the axles. Position the driver, batteries, and motor low and near the center of the car to reduce spinning. A static test for stability is to lift one outboard wheel; the vehicle should not tip over at 33 degrees.+2
Aerodynamic Optimization
Last Updated: March 30, 2026Drag increases exponentially with speed and becomes a major factor above 15 mph. Aim for a “teardrop” or airfoil shape to minimize resistance. It is also vital to minimize the “frontal area” (the size of the hole made in the wind) and “wetted area” (total body surface in contact with air).+2
Chassis Design & Materials
Last Updated: March 30, 2026The chassis is the backbone of the vehicle; simplicity and reliability are key for beginners. While weight is important, most vehicles weigh over 350 lbs with a driver, so focusing on strength and safety is more critical than saving a few pounds. Advanced builders may use monocoque construction with composites like fiberglass, Kevlar, or carbon...
