Fixed or single speed

If the theory is that a bikes wheel holds the road better when being driven (pedalled in this case) rather than when it is freewheeling then surely this will negate (some of) the weight placement theory?

If its wet then you need to get more weight over the back to keep grip for the same level of torque in the dry. I personally feel the weight = downward force is more important at the front to assure enough traction.