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Re: 4" vs. 6" + 8" Diameter Wheels
For us we use the smallest practical wheel we can get away with. Why?
1. Less gear ratio required for same pushing force at the wheel.
2. Move the wheels out further front and back.
3. Less linear feet of tread to deal with (less chance of losing tread)
This really adds up to less weight overall. Smaller wheels = less weight. Less gear ratio usually = less weight.
For us, 4" seems to be the sweet spot.
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In full disclosure I am the President of VEX Robotics, a division of Innovation First International.
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