Drafting busses and lorries

chris crash some one said that we could stop at about 0.5g with a front break, and cars at 0.8g, so they would have roughly 60% more stopping power.

they would also have more mass, a lot more mass, greater then 60% more, so i at the same speed would have more velocity and therefore a longer stopping distance. i would also hazard a guess that the 0.8g is for all four wheels with the pedal break, while the 0.5 is for just a front.

It is to do with the center of gravity being high on bike that limits braking power of a bike. The friction which can be archived between the fount tyre and road is greater than or equal to the amount needed to allow rotation about a point (the point in question being the contact point of front wheel to the road surface). DUe to the longer nature of a tandems and cars (also the lower center of gravity) the amount of force required for the car / tandeml to pivot about the contact point it greater than the maximum friction that can be achieved.