Tuesday, July 10, 2012

Your First Three Years ~ Part 4:

Bike Handling Essential & Emergency Skills

A Guide for Beginner (and Experienced!) Cyclists, to the Art and Practice of Cycling.  Becoming Proficient, Fit, and Happy on your bike.



Let’s start with a sort of summation.  There are three “B-4s” in cycling.
Eat Before you are hungry.
Dring Before you are thirsty.
Shift Before you need to!

Today we want to focus a bit on those first two.  Then we can move on to some truly important handling skills.

Eating and Drinking on the bike:
Honest, it is important to eat and drink while you ride.  It’s not so critical while you are taking shorter rides, but as your time in the saddle increases, you will need to eat and drink during your rides.

Drink first!  Here’s how.  Practice this a bit, in a safe place, well away from traffic.  Start with the technique we discussed last week.  Move your hands in to the center of the bar.  This will help you stabilize the bike as you lift one hand from the bar.  Now, DO NOT LOOK DOWN!  Instead, feel your way down along the headtube of the bike, then along the down tube, until you come to the top of the front bottle.  (Hint:  This is a good time to pull the valve of the bottle open.  Do it before you remove the bottle from the cage.)  Now slide your hand farther down, until it is around the main body of the bottle.  Grasp firmly, and pull the bottle up and forward, out of the cage.

Next, straighten up slowly, and raise the bottle until the valve is next to your mouth.  (Keep the bottle to the side, so you don’t obscure your vision forward.)

Drink!  Squeeze the bottle to squirt some water into your mouth, then swallow.

When you are finished with your drink, you will want to return the bottle to the cage.  Use the base of the bottle to feel your way along the downtube to the cage.  Then press the bottle into the cage, while still holding it.  Don’t let go of the bottle until you have secured it in the cage.

Eating on the bike:  This is a bit more difficult.  I do not advocate attempting to ride “hands free.”  Most food things require two hands to get opened.  More, unfortunately, most of us don’t have team cars or domestiques to come along and hand food up to us.  So the strategy has to consider ways and means to eat one-handed.  Some more solid items lend themselves to this.  Open packages first, before the ride, so that this kind of food is accessible.  But possibly a better tactic is to plan to take a short break every 20 to 25 miles.  Pull over, get off of the road, dismount, and eat your snack.  (Keep this kind of stop short and your legs will not stiffen up.)

In a future post, we’ll discuss more aspects of hydration and nutrition, but for now, start working on eating before the ride, drinking before the ride, and your in-the-saddle drinking skills.

Bike Handling:

Taking the Corners.  It’s important to remember that the thing that keeps a bike upright is a bit of physics.  Rotating masses (in this case wheels) do some magic.  They tend to resist being shifted out of position.  When one does apply force to the center of the wheel, it reacts in an odd way.  If a force is applied to the axel in one direction, the wheel tends to move at 90 degrees to that force.  (Sound complicated?  It’s not.  Keep reading.)

If the axel is forced to turn to the left (say by moving the handlbar that way), the wheel will try to lean to the right.  In a similar fashion, if the axel is force to turn around the bike’s forward axis (by pushing down on one side and pulling up on the other) the wheel will tend to turn.  If the down force is on the left side of the axel, with the bike moving forward, the wheel will try to turn to the left.

All this is completely counter-intuitive.  It’s best to go out to your big, wide, safe, no-traffic area and do some experimenting.

Get the bike up to a low-moderate speed.  Say 10 to 12 mph.  Then hold the handlbars in a straight-ahead position, and gradually lean apply weight with your hand to one side of the bar.  The bike tries to turn to that side, doesn’t it?  In fact, this is how a turn is initiated, and one follows the wheel lean by turning the bar.

After you’ve experimented with this, we’ll work on a couple more skills.

Leaning with the bike.  Turning the bike is a bit of a balancing act.  As the bike leans over to turn, there are two forces applied to the tire.  One is the acceleration to the side, and the other is the down-force of the weight of the bike and the rider.  That side-ward acceleraction is generated by friction between the tire and the ground as the wheel changes direction.  Now here comes the tricky part.  Mr. Isaac Newton tells us that the whole shebang will resist any acceleration.  So the bike “wants” to keep travelling in a straight line.  (This is that “centrifugal” force you’ve heard about.)  If the turn is sharp enough, the friction between the tired and the pavement is broken, and the bike skids.  This last is much more likely to happen if the rider is trying to keep the bike completely upright.

To corner well, the bike must be leaned into the turn.  The best and easiest way to do this it to lower your body down closer to the bike, and then follow it as it leans into the turn.  Remember, turning is accomplished by first “weighting” one side of the bar, and then following the bike’s turn with a gentle lean and a turn of the bar.

The Instant Turn.  There are times when something happens in front of the bike, something abrupt.  Often it is far better to steer around the problem, than to try and hit the brakes and attempt to stop before hitting it.  This requires an aggressive, high-performance turn, not the gentle banking we just discussed.  It is possible to make the bike turn almost immediately, using some of the same physics we just discussed.

Here’s the tactic in a short form.  To begin the “instant turn,” turn the handlbar, but turn it away from the direction of the new turn.  The bike will lean sharply in the direction opposite to the bar turn.  Then, as the bike leans, lean with it, and follow the turn quickly with the bar.

For example, suppose you are cruising down a street, and a parked car’s door suddenly opens in front of you.  You are going to need to turn left, and do it quickly.  In this case, the handlbar is turned right to initiate the turn, then as the bike leans suddenly and sharply left, the rider leans with it, and follows  the lean into the turn by bringing the bar around to the left.

This manuver takes practice.  I’d recommend doing it in a traffic free area.  Do not use clipless pedals or toe clips!  Always wear your helmet.  And be ready to straighten out, if things are getting out of hand.  As usual, start practicing this manuver at lower speeds, and gradually increase speed as you build familiarity and proficiency.



Braking:
This can seem simple.  But not really.  Many folks are scared pale at the mere thought of ever touching the front brake.  There is this urban folklore that if one should ever happen to engage the front brake, the rider will then instantly burst into flames and be hurled forward, off of the bike, into the air, and will come to rest in a tangled, broken, smoldering heap, never to rise again.  Come now.  Let us reason together.  In this litigeous age, would a manufacturer dare to install such a device on a product?  Yes, if mis-used, or over-applied, the front brake can cause problems, and lead to injury.  So can table salt.

The truth of the matter is that the front brake is the stronger of the bike’s two brakes, and is the most useful.  But it does require skill to use it effectively.  Fortunately, that skill can be acquired by any reasonably intelligent and coordinated rider.  (If my brother can figure it out, honest the rest of you can!)

Before going on, we recommend you go back to the post of June 26  There you will find some instruction and a drill for learning to control the front brake.  Id you haven’t already done so, start by working on that drill and skill.  Once you have gotten comfortable with routine handling of both brakes (and especially the front one) you will be ready to continue to the following work.

Sudden stop.  There are two keys to this manuver.  First, learn what your front brake is capable of, and how to control it.  Second, get your weight down and back.  If you’ve followed our suggestion above, and reviewed basic braking drills, you are about ready for the “Sudden Stop.”  As with the beginning braking drills, practice this one in a safe location, free of traffic.

Begin by taking the bike up to a modest speed.  Now scoot back to the farhest rearward extreme of the saddle.  Level your cranks and flex your legs.  Lower your upper body, down low, while extending your arms to move your body rearward.

From this position, apply both brakes.  Make this a brisk application, but not a severe one.  Repeat, gradually increasing the braking power with each repetition.  One of the things you are looking for here is the “lockup point.”  That is the force of brake application which will cause the wheel to lock and skid. 

Skidding is not the fastest possible stop.  In a skid, the tires have broken traction with the pavement surface and are sliding, with little loss of speed.  The key concept here is modulation.  You are modulating when you are changing pressure on the brake levers, to hold the bike just below the lockup point.  If either wheel starts to lockup and slide, reduce the pressure on that lever.  The idea behind this kind of stop is to keep the tires just short of lockup.  In other words, when the bike is going at 10 mph, the wheels should be turning at about 9.9 mph.  Practice this!

Once you are good with a hard stop from a lower speed, increase the speed a bit and repeat the drill.  This one does take practice, but it is well worth the effort.  A modern bicycle can be stopped in a remarkably short distance, even from a high speed.
           
Rock dodge.  Often, if the front tire hits a larger obstacle, it can be deflected, and cause a spill.  Sometimes the rider gets very little warning about such an obstacle.  The idea is to steer the front of the bike around the rock (obstacle) very quickly, and back onto course again.  Usually the rear wheel will hit the rock (obstacle) but this doesn’t cause more than a bit of a jolt.

To practice this one, I recommend taking a damp sponge to your practice area.  You can use the sponge to simulate your “rock” with no fear of bad consequences if you hit it.

Place the sponge on the ground.  Ride up to it, and just before the front wheel rolls over it, do the following.  Turn the wheel sharply to one side, and then bring it back in the opposite direction.  Properly done, this should steer the front wheel around the sponge (rock) and back onto the original course.  The rear wheel will usually roll over the sponge.

Once again, practice this at lower speeds first, and gradually increase speed as your skill and confidence build.  (Wearing your clipless shoes, and being clipped in is not recommended for this skill drill!)

There you have it.  That’s a pretty full quiver of skills.  You’ll be practicing these for a good while.  They are practical, and very useful.  Master them, and you are much less likely to get into trouble, and much more likely to be able to get out of it.

Next week: Next Week:  Practice Practice Practice!!

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This series began with the post on Tuesday, 19 June 2012.  It is intended to continue for three years.  Each week, we will discuss exercises, skills, practices, and activities designed to bring the new (or “experienced”) rider a high level of cycling competence.  We’ll address common problems, and (always) stress safe practice.

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A Note on Timing:  This series uses Mid-June as the starting point of the “Cyclists Year.”  We do this because this is the time that most folks decide to start riding.  If you are following this guide, you can “adjust” the timing to fit your personal “first three years.”  Do note that some of the posts will concern weather and seasonal changes.  When that starts to happen, just swap the “months” around to fit your personal timeline.

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