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.
How does fork rake affect handling?
Increasing the amount of fork rake will have the opposite effect: as the amount of trail gets smaller, the front wheel is less likely to follow the direction of the bike.
What does rake fork mean?
Fork rake is the distance between the steering axis (blue line) and the fork blades (purple line) at the front wheel's axle. The measurement is taken in millimeters on a line extending from a right angle from the steering axis and bisecting the center of the axle (the orange line).
What difference does fork rake make?
Fork offset — also known as rake — is the distance between the axle and a straight line through the head head tube. Offsetting the fork more (increasing offset) pushes the axle further in front of the head angle. Reducing the offset — which is what many bike designers are doing today — pulls the axle closer.
What does rake mean bicycle?
Rake and Trail:
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”. Straight blade forks can have plenty of offset.
16 related questions foundHow do you measure fork rake on 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.
How does fork offset affect handling?
Increasing fork offset reduces trail. Larger wheels increase trail. With a larger wheel (e.g., a 29” wheel) the axle is higher off the ground compared to a smaller wheel. If you draw a line through the steering axis to the ground, it intersects the ground farther forward of the axle, increasing trail.
Can I run 27.5 wheels on a 29er fork?
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 important is fork offset?
While a slack headtube increases stability, along with longer reach, you start to lose that front end feel and thus, losing traction. By reducing the forks offset, you are bringing the wheel back under the mass of the body, helping keep that traction, while still having a longer wheelbase and slack head tube angle.
What does trail mean on a bike?
Trail is the horizontal distance from where the front wheel touches the ground to where the steering axis intersects the ground. The measurement is considered positive if the front wheel ground contact point is behind (towards the rear of the bike) the steering axis intersection with the ground.
What offset fork BMX?
Most forks have straight legs and dropouts at the front where you insert you wheel, the distance from the fork legs to where the wheel sits is called an an Offset. Historically BMX forks have an offset of about 33mm, but there are forks available with much shorter offset these days.
What makes a bike have better handling?
Ride in a Straight Line
When you are out on your next ride, hug the line on the side of the road. Practice looking over your shoulder and NOT veering off the line. Stay relaxed and bend your elbows. This skill will help you better control your bike when you are riding in a group.
How can I make my road bike more stable?
Generally though, if you move the front wheel forward by decreasing the HTA, the bike becomes more stable. Conversely, if you move the wheel forward by increasing the fork's offset you make the bike less stable.
How do you reduce wheel flop?
A more upright position puts less weight on the front, resulting in less wheel flop. To compensate, remember, you want just the right amount of “power steering” — a shallower head angle increases the amount of wheel flop.
What difference does fork offset make?
Fork offset, combined with head angle, affects something called 'trail', and ultimately whether it's a dog or a whippet on cdertain descents, thus explains bike fettler extraordinaire Chris Porter from Mojo. A bike feels great when descending if it has steering that is stable at high speeds and when in the turns.
What does 44mm offset mean?
Again, it's all personal preference. Here's the skinny: 51mm offset reduces “trail” and adds turning agility, while 44mm offset adds “trail” and adds straight-line stability, especially at high speeds.
How much does fork travel affect head angle?
Geometry changes
As the fork gets longer, it raises handlebars up and slackens the head tube angle. As a rough estimate, each 20mm of travel added will correlate to a one-degree difference in the head tube angle.
How do I get a new mountain bike fork?
MTB wheels come in three sizes; 26”, 27.5” (650b) and 29”. When choosing an MTB rigid fork make sure it's the right size for your wheels. If your MTB or city bike is running V-brakes, check that the fork has mounts on the legs for the V-brake arms to be attached.
Can you put 29 inch wheels on a 27.5 frame?
Yes, you can do it. The diameter of a 29" wheel & tire is slightly larger than a 27.5+ wheel & tire. The 29" setup will raise your bottom bracket height.
Can you put 26 inch wheels on a 29 inch bike?
Condensed Answer: Technically, it's possible to install 26″ wheels on a 29″ bike if both are designed for disc brakes. However, 26″ wheels will cause drastic changes to the bike's geometry (e.g., dangerously low bottom bracket) to the point where the conversion becomes pointless and dangerous.
What is bottom bracket offset?
BB offset, could be referring to "drop" which is the distance the BB sits below the wheel centres. A larger drop means a lower BB (generally), though on trials bikes, it's the other way round as they like to (now) sit above wheel centre.
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.
How do you measure Fox forks?
Use a zip tie around the stanchion to make the measurement. Push the zip tie down to the wiper seal and then compress the fork all the way. This is your total travel. Then fill the fork to your regular pressure, push the zip tie back down to the wiper, and go ride your favorite trail.
How are road forks measured?
Measure from the fork crown race to where the lower pressed race would enter the head tube. Next, measure the upper stack from where the upper pressed race would enter the head tube to the top of the adjusting race. Add any spacers and add the height of the stem. Add all these numbers together.
Should the saddle be higher than the handlebars?
As a general rule of thumb, you want the top of the handlebar about as high (or higher than) the saddle, unless you're a sporty rider looking to ride fast. Try touching your elbow to the nose of the saddle and reaching forward towards the handlebar with your hand.
