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With increased trail, the bike has less lean, so more power can be used in corners.  Most guys who race use a lot of lean, so tyres become more important and accelerating through corners becomes more difficult. You will probably find that riders do not actually lean the bike, they adapt to the angle of lean the bike adopts. It is almost impossible to increase the angle of lean on a Manx Norton. When you race, it pays to take note of what the other guys are riding, when you know how the bikes handle. It can tell you where they will be, when you are behind them. Very few bikes can go just anywhere on a race circuit.