Leanometer measures the various forces acting on the motorcycle, and uses this information to display or make further calculations. Leanometer shows:
Lateral cornering force in g
This is the force pushing the bike towards the inside of the turn. Only the grip of the tyres on the road is providing this force, so it is a measure of how hard you are cornering. As cornering force increases (or available grip decreases), the tyre will eventually break away from the road and the bike will slide. Safe, smooth riding is about minimising lateral g for a given speed, and this where good choice of cornering line is invaluable.
Lateral g is displayed in graphic steps, each one being 0.1G by default.
Frame Lean Angle in degrees
This is the angle between a vertical line and the centreline of the motorcycle. To counteract the centrifugal force in a corner, you instinctively move the weight of the motorcycle to the inside. However, the motorcycle is inherently less stable when leant over, and there is a finite amount of lean angle available. Many riders move their weight to the inside of the bike in order to keep the bike more upright.
The diagram to the right shows an interesting aspect of lean angle - there are in fact two measures of it! The width of the tyre causes the lean axis to be offset, which means the frame lean will be rather greater than the ‘system’ lean angle. The wider the tyres, the greater the difference.
This has important consequences, as there is only so much available lean before something touches down, or the tyre runs out of grip. Move your mouse over the diagram to see how the rider can reduce this difference by moving body position.
Leanometer measures Frame Lean because it’s actually how far the bikes is leaning, and you can learn something from it. Note: GPS-based devices like smartphone apps cannot measure this, and only display theoretical system lean.
Frame angle is displayed numerically in whole degrees.
Deceleration force in g
This is the force along the axis of the bike created by deceleration or braking. Smooth braking is vital for keeping the bike stable at the start of a corner. Uneven, peaky braking causes a high proportion of self-inflicted road accidents.
Deceleration force is displayed in graphic bars on the left, with full scale being 1.0g.
Acceleration force in g
This is the opposite of braking. Timing and rate of acceleration are critical for safe corner exit, and this is down to throttle control.
Acceleration is displayed in graphic bars on the right, with full scale being 1.0g.