Re: Tomorrow's bike: anti-lock roller brakes -- and???

Ben C? writes:

Going over the bars is not related to HEAVY braking:

http://www.sheldonbrown.com/brandt/over-the-bars.html

Can anyone tell me if when doing an endo the bike rotates around the
contact point of the front tyre, or around the front axle, or around
both?

The wheel continues to roll on the road as before while the bicycle
essentially becomes a rigid extension of the wheel as it rolls on the
road. It's instantaneous center of rotation is the road contact
patch just as when the brake is not applied. It doesn't skid under
the conditions mentioned.

If the front wheel is locked, then rotation is around the contact
point. But you can endo before it locks. Then what is the axis of
rotation?

Don't make it so complicated.

Thought experiment: bicycle with two very big wheels, so big that
the centre of mass of the whole thing including the rider is below
the height of the hubs. But the triangle formed by the contact
points and the centre of mass is the same as that for a regular
bicycle.

Build any contraption you like, we're talking about store bought
conventional upright bicycles.

Can you endo this machine? Or only if the front wheel is locked?

Who cares?

Jobst Brandt
.

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