How To Run Over That Thing In
The Road
Sooner
or later you will find something in the road just ahead of you and you
are going to hit it. Maybe a small animal. Possibly something that
falls off of the vehicle in front of you. Maybe you have missed a
curve and a curb is dead ahead.
One of
the exercises taught by the MSF includes running over a board (4x4?)
and you are told to 'lift' the front-end of your motorcycle at the
last possible moment before you hit. I suspect that most of us could
actually 'lift' the front-end of a little 125cc motorcycle, but I can
tell you that this is one reasonably strong male that couldn't raise
the front-end of my GoldWing a meaningful fraction of an inch, from my
seat, and neither can you. What's the point of the exercise, then?
Maybe
it was just badly explained in my particular class, but I'm sure that
what the instructor said was that you are trying to 'help' the bike
over the obstacle by lifting it. While that is correct, both the
explanation and the exercise fell as short of the mark as did my
ability to lift the Wing.
Remember
our discussion about shock
absorbers? It was learned that bumps are first absorbed by your
springs and that your front-end rises and falls as allowed by how the
shock absorber/spring set are designed and setup. If you are traveling
at a steady speed your front-end is extended about as far as it will
normally be extended and your ability to 'lift' it further is a
function of how much weight you can remove from it, not how strong you
are. That 'for every action there is an equal and opposite reaction'
tells you that if you are able to exert 200 pounds of lift on your
grips you will put the same amount of new 'weight' on the seat and
pegs while you do it. So, even if you try to 'snap' lift the front
while throwing as much of your body towards the rear of your bike as
possible, the result will be a TRIVIAL difference in the extension of
your front forks. ie, virtually a waste of time and energy.
Still,
the idea is RIGHT! But instead of you doing the lifting, you want the
bike to lift itself by transferring its weight from the front to the
rear wheel.
You
already know that this happens naturally as a result of acceleration.
So, the way you lift the front end without suffering a hernia is to
twist your wrist and open the throttle.
But you
will remember that your front-end is already almost fully extended to
start with. Wouldn't it be nice if you could get a whole lot more
extension just before you hit that object? Well, of course the fact is
that the only way to do that is if the front-end was more heavily
loaded (compressed) before you started to accelerate. And how do you
get the front-end to be more loaded? Why you hit the brakes, of
course.
In
other words, in the real world if you see that you are going to hit
something you will naturally apply your brakes in an effort to slow
down before you do so. Isn't that fortunate? For in order to maintain
as much control of your bike as possible WHEN you hit it all you have
to do is roll-on the throttle at the very last moment (about 1/2
second will do very nicely.) This will result in a weight shift from
front to rear, and allows the springs in your shock absorber system to
extend. Thus, as you hit the object you have maximum shock absorbing
capacity, just when you need it. (Don't forget to shift your weight to
your pegs and get that butt off the seat when you do this since when
the rear tire hits the obstacle it will receive a severe vertical
bounce.)
[I
suppose it is obvious, but since you are going to experience a
vertical jarring of the bike and you are going to be lifting your butt
off your seat just before that happens, you will want to have all of
your fingers wrapped around your grips at the time - not covering any
levers.]
But why
not just stay on the brakes all the way, you ask? At the very least
this will insure that you hit the object with the minimum of speed
possible. What's wrong with that?
The
shock absorber system is compressed almost as far as it will go during
hard braking. That means there is essentially no more travel left to
absorb the bump. That, in turn, means that you will FEEL and be
affected by that bump - just as if you didn't have any shock absorber
at all. You will remember that this means that the entire bike will
rise and fall at least as much as the height of what you hit because
it is no longer 'sprung weight'. And it is just such bike motion which
usually translates into loss of control!
Another,
but equally important reason you do not want to have your brakes
maximally applied at the time you hit the object is that you are then
at, or past, the point of a skid. When you hit you will certainly pass
that point and end up in a skid. It takes only a fraction of a second
of front tire skid to totally lose control of your motorcycle. If you
happened to be going is a straight line when you start a skid, your
chance of recovering and not going down is actually pretty good. But
if the skid is the result of your front-end being lifted off the
ground because of hitting something, the odds that it will come down
with the front wheel pointing straight ahead is not very good at all.
The
third reason you do not want to be braking when you hit is that the
object may well be alive and your tires will act like erasers
as they go over it. Indeed, the 'object' you hit might even have been
human (before you 'erased' it.)
Five
things to do if you are going to run over something:
Use maximum braking in an effort to stop before you hit it.
Wrap all of your fingers around your grips - do not 'cover' any
levers
Roll-on your throttle starting about 1/2 second before the impact
and shift your weight onto your feet.
Roll-off your throttle right after the front tire surmounts the
obstacle (shifts weight to front and lengthens the rear shocks).
Control stop (if you want to) after BOTH tires return to the ground.
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