Fork Rake is also known as Offset, which more accurately describes what it is: the hub’s offset from the steering axis. Not to be confused with the curvature of the fork blades, which some people think of as “rake”. … Fork offset determines trail when considered with head angle (and the diameter of the wheel).
How does fork rake affect bicycle handling?
Fork rake or fork offset is a key factor in the handling of a bike. … The amount that the fork is offset from this imaginary line is known as fork rake in road bikes, or fork offset in mountain bikes. Increasing the offset will make steering faster, conversely decreasing it will slow it down.
What is the rake of a bicycle forks?
Simply put, fork offset, or fork rake, is the distance between the front axle and the steering axis – the imaginary line running straight through the midpoint of the steerer tube. Fork offset is linked to another important measurement: trail. … Higher trail means greater stability and lazier, slower steering.
How important is fork rake?
Offsetting the fork more (increasing offset) pushes the axle further in front of the head angle. … By reducing the fork rake (offset), the head angle remains the same for stability at high speed and down steep and rough trails, but the wheel is closer to the steering axis for better handling, especially at slower speeds.
How is fork rake measured on a bike?
Measure the height of the fork dropout off the top of the flat surface (Dim A). Measure the height of the center of the steerer tube off the top of the flat surface (Dim B). Subtracting Dim B from Dim A will result in the fork offset or rake.
What is aggressive bike geometry?
Aggressive geometry puts your upper body down lower for aerodynamics and the bikes tend to favor a more twitchy handling traits. Relaxed geometry has you sitting in a more upright position and the bike is setup to feel more stable at speed.
Is fork rake the same as offset?
Fork Rake is also known as Offset, which more accurately describes what it is: the hub’s offset from the steering axis. … Fork offset determines trail when considered with head angle (and the diameter of the wheel). Trail is best thought of as the tire patch “trailing” behind the steering axis.
What is the offset on a fork?
Fork offset is the distance between the front axle and the steering axis of the fork. The diagram above shows how the front axle is offset so it is forward of the steering axis. This offset is measured in millimeters. Its purpose is to adjust the amount of ‘trail’ in the steering geometry.
What does 44mm offset mean?
A reduced, 44mm offset fork allows the rider to run a slacker geometry with a similar wheelbase, but still enjoy a stable steering platform without sacrificing traction, stability, and control.
What is bike rake angle?
Rake (also called caster) is the angle of a motorcycle’s steering head of the frame (A). … Think of it as how far the contact patch trails behind the steering axis. Too much trail makes a motorcycle difficult to turn; too little makes it unstable.
Can you use a 29er fork on a 27.5 bike?
Condensed Answer: If the bike and the wheelset are designed for disc brakes, a 27.5” wheel will fit on a 29” frame and fork. Since 27.5” wheels are smaller, their diameter will change the geometry of the bicycle in a manner that the rider may not appreciate.
How does fork length affect trail?
Increasing the fork length raises the front of the bike, while decreasing the fork length lowers it.
How does fork trail affect handling?
When the contact patch for a wheel trails behind the steering axis of a fork, it will tend to align with the direction of the bike (like the wheels of a shopping trolley or an office chair). … If there is too much trail, though, then the bike will be difficult to steer.
What is rake measurement?
A rake is an angle of slope measured from horizontal, or in some contexts from a vertical line 90° perpendicular to horizontal. A 60° rake would mean that the line is pointing 60° up from horizontal, either forwards or backwards relative to the object.