Drive kinematics. Wheel speed ωw = (2π·nmotor/60) / i, reduction i = 3.2; road speed v = ωw·r with r = 0.31 m (typical 17-inch motorcycle tyre, flagged as typical). Max motor speed in the model: 8500 rpm.

Independent check (textbook formula v = π·D·nwheel, D = 2r, n_wheel = n_motor/i): ...

Assembly. A part snaps when its position error is under 0.40 model units and its rotation error is under 20 degrees, and its dependency parts are installed first.

Honest simplifications.

• Speed is pure kinematics: no torque curve, battery limit, aerodynamic drag, rolling resistance or traction. At full throttle the readout is a theoretical ceiling, far above what a real road bike with this ratio would be limited to.
• All 133 parts are procedurally generated shapes; masses, materials and the 3.2:1 ratio are illustrative, not engineering data.
• Steering, suspension and braking are visual kinematic animations, not a dynamics simulation.
• Textures are simple procedural maps, not photographic.

Illustrative design, not affiliated with any real manufacturer. VOLTERRA S9 is a fictional vehicle; no real vehicle safety certification or manufacturing dimensions are implied.