Motorcycle dynamics: Use your body!

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Moto1Pro y EnduroPro

Published on Sep 27, 2023
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One of the biggest differences, if not the biggest, between driving a car and a motorcycle is that your body, your movements on the bike, influence the way it behaves… a lot. For better… and also for worse. You don’t have to ride on a track or a sports bike to know how to “move” on the bike. It’s clear that it’s not the same on a sports bike as on a Custom, a Naked or a touring bike, on a track or on the road, on asphalt or on dirt… That’s why today we’re going to focus on asphalt and open roads and if you still have doubts, desire or both, we’ll cover the track, preferably on the track itself, and off road… I’m really looking forward to it. Many of you will ask yourselves, what if we go with a passenger? If we go with a passenger, we forget about all or almost all of this. If you have someone with you and you come to a curve and “stick your butt out” the person behind you is going to freak out and many things can happen. Because remember the most important thing: With a passenger you have to slow down and ride very smoothly and these things, if we ride like this, are not necessary. Let's look at the four cases we are going to encounter: Stabilized speed, braking, acceleration and curve. Stabilized speed. For this we don't need a board, just common sense. There are motorcycles that mark your position when you are riding and you have practically no escape: On a sports bike with low handlebars you put a lot of weight on your hands, on a Custom bike with wide and high handlebars you put all the weight on your buttocks. For all the others, the idea is this: distribute the weight. On a motorcycle your weight rests on three points, your feet, your hands and your butt. The feet support the weight of the legs, because for them to support more you would have to be using force with your legs, which will be necessary in other circumstances, but not at cruising speed. If you support all your weight on your buttocks... it will take its toll. Part of the weight should fall on your hands and for this the trunk should be leaning forward. How much? Well, it depends on your bike and your tastes. My trick, on bikes with little or no fairing, is to find a balance between the weight I carry in my hands and the force of the wind that pulls me back… but I insist, it is a balance that you have to find. Braking. We get to braking and the idea is very simple, what happens to the weight when we brake? It moves forward, so we want to move the weight back. We will make an off-road video later, but it serves as an example, because off-road the body moves a lot and when braking you practically sit on the rear mudguard. On a road bike you don’t have to go that far, but stretch your arms and move your torso back… if you can move your rear a little, better, or if you have a support make sure you are as far back as possible. Acceleration. The same… but exactly the opposite. Shrink your arms, put weight in front if you can, moving your rear on the seat until it stops, this time with the tank. I remember some statements, I think they were made by Colin Edwards, complaining about his Honda at Jarama on the climb to Pegaso, a very special curve, where you lose the steering or, at least, it lightens up… In a curve. And we get to the curves… and for that, we use a hermetic whiteboard! But for those who only listen to the audio, I will try to explain it in a way that you understand without needing an image. Because in a curve everything gets complicated. Why? Because the centre of gravity of a motorcycle is very high… let’s compare a car and a motorcycle… How do you solve this problem? Let’s turn the page… there are two solutions: One, tilt the motorcycle, as we see on the whiteboard… The other, “get off” the motorcycle, so that the weight is lower and more towards the inside… And now we are going to compare the centre of gravity and the angle it forms with the tyre mark on the car and with a motorcycle tilted with the rider off… magic! It turns out they are the same! But the bike has two disadvantages: One: Its tire has a curved profile to be able to lean, which means the rubber surface on the asphalt is smaller and two, the suspensions work very poorly with the bike lying down… The conclusion is clear, how much should you move on the bike? Well, it depends. “What does it depend on?” Well, above all, on three factors: If you go alone, on your driving level and the type of bike. If you go with someone, as I was saying, ride smoothly and with room… there is nothing else to do… If you are a beginner, hanging back is nonsense. Focus on handling the controls well, on being smooth and on tracing well and when you have all that automated, then you get on with this. And if you go on a Trail, a big scooter, a Custom or a GT, then moving back and forth a bit is the most you should and can do. Another thing is sports bikes, naked bikes or café racers, generally more dynamic bikes and in many cases lighter, which will appreciate the help you put your

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