You should never ever need to adjust the friction settings of the wheels, @bewing; that design, for example, has plenty of ground drag at the back at low speeds or at rest. It's problems are entirely aerodynamic.   The issue is very straightforward. It's CoL is so far back (and more or less aligned with the rear gear) that what happens is that the rear gears are being lifted off the ground, reducing their traction and drag, and causing the wheelbarrow effect. The rear gears and CoL bei
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