The Decreasing-Radius Corner at Speed
You are riding a two-lane mountain road at 45 mph. A sign warns of a curve ahead with a recommended speed of 30 mph. You enter the curve at 45 mph, and about halfway through you realize the curve is tightening - the radius is smaller than it looked, and your line is drifting toward the centerline. You are in a right-hand curve, leaning right. There is oncoming traffic visible about 300 feet ahead. Your front brake is available, your rear brake is available, and you are in third gear. The pavement is dry.
1. What is the correct sequence of actions, and why is braking in a lean different from braking upright?
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First, look through the curve toward the exit and hold your line - do not stare at the centerline or the oncoming car, because the bike goes where you look. Second, apply smooth, progressive braking, favoring the front brake, while reducing lean: straighten the bike slightly as you brake, because in a lean the tires have less traction available for braking (traction is shared between cornering and braking). Do not grab the brake - a sudden front-brake grab in a lean can cause the front to wash out. If you are carrying too much speed, a light, smooth application of both brakes while gently standing the bike up and then re-leaning into the tighter radius is the controlled approach. Rolling off the throttle alone also slows you and tightens your line. The recommended 30 mph sign existed because the curve's geometry demands it; entering at 45 mph was the root error.
2. You must choose between braking hard and leaning more to stay in your lane. How do you decide?
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The decision turns on available traction and space. Leaning more increases cornering force and consumes traction; braking also consumes traction. Doing both hard at once exceeds what the tires can deliver. If you have lane width left, a smooth roll-off plus gentle braking while maintaining lean may tighten the line enough. If you are already at the centerline with oncoming traffic closing, the priority shifts to not crossing into the oncoming lane: reduce speed decisively but smoothly, accept a wider line within your lane if possible, and if you must choose, a controlled low-side risk within your lane is preferable to a head-on. The judgment: never trade a certain head-on collision for the possibility of a slide; use the brakes and lean available to keep the bike in its lane.
3. After the curve, what should you change about your approach to the next warning sign, and what does the 30 mph recommendation represent?
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The recommended speed is the speed at which a typical rider can negotiate the curve comfortably with margin; it is not a target to beat. On the next curve, slow to the recommended speed before the curve, set your entry speed, look through to the exit, and use a delayed-apex line for a right-hander so you can see farther and have room to adjust if the radius tightens. The lesson is that curves can tighten and sight lines can hide geometry, so entry speed should be set conservatively and adjusted with the throttle and smooth braking rather than discovered mid-corner.