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.
Does offset of fork matter?
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.
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.
Is a shorter fork offset better?
In simplest terms, a shorter fork offset increases the trail measurement of the fork. It does so by way of increasing the distance between the tire's traction patch on the ground and the point where the steering axis line intersects the ground.
What is the difference between 44mm and 51mm offset?
44mm vs 51mm Offset
Mechanical trail has a similar difference. 44mm offset has 108.7mm while the 51mm offset comes in at 101.7mm. This means that the 44mm offset will have a bit more stable platform. If we wanted to design the same amount of trail into the 51mm offset fork we would need to decrease the headtube angle.
39 related questions foundWhat happens if you change fork offset?
Both the headtube angle and fork offset can change the length of the trail number. By making the head tube angle slacker (decreasing the angle) you will make the trail longer. By reducing the fork offset, you will also make the trail longer.
What does increasing fork offset do?
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 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.
Can I put 27.5 wheels on a 29 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.
What is 12mm wheel offset?
A wheel with a -12mm offset would have a hub mounting surface 12mm inside of the wheel centerline, or closer to the back side of the wheel lip. This type of wheel usually has a "deep" look as compared to a zero or positive offset wheel. Most all factory truck wheels are positive offset to one degree or another.
What does +45 offset mean?
ET wheel numbers can be either positive or negative to reflect the values of wheels with either positive offsets or negative offsets. For example, an ET45 wheel measurement has a positive offset of 45mm, which means that the mounting face is 45mm in front of the centre line.
What is 0 mm offset?
Your wheel offset is the distance from where you mount your wheel to the wheel's center. The centerline is the literal “center” of the width of your wheel. This centerline is also known as a 0 mm offset. That's important to note because your wheel offset is always measured in millimeters.
How do I find my fork offset?
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.
How does offset affect handling?
Too much positive offset (the wheel sits too far in towards the car) can cause damage to inner suspension and brake components from the inside lip. This can lead to poor handling making the car unstable at speed. Sometimes the rubbing will happen on the inner sidewall of the tire causing a rupture of the tire.
Is fork rake and offset the same?
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.
How does trail affect bike handling?
The slacker the head angle, the shorter the offset or the bigger the wheel size, the more trail. Generally speaking, the more trail, the more stable the steering. This is because there is a restoring force when the steering is turned away from straight ahead, which acts to self-centre the steering to straight ahead.
Can you jump a 29er?
It's pretty clear- 29ers are here to stay. Not just a fad, the big wheels of the 29er have evolved from being a side show curiosity to a standard tool for discriminating XC and endurance trail riders for some time now.
How tall should you be for a 29 inch bike?
If you're 5'6' or taller, you should be able to find a 29er model to fit you. Riders more than 6' tall can rejoice: You'll definitely enjoy a more natural riding position with the size and frame geometry of a 29er.
Can I put 27.5 plus on my 29er?
The good news is you just need a 27.5+ tire and a wide-ish 27.5 rim. You can use standard hubs to build up the wheels, though you won't be able to reuse your 29er spokes.
How does fork Trail affect handling?
Trail affects the steering, as it is basically a measurement of the amount of influence your steering inputs actually have on the contact patch. Also related are the effects of wheel flop generated by your head tube angle and fork.
How does fork rake affect bicycle 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.
How does fork length 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.
What is a low trail bike?
“Low-trail” bikes, designed to carry cargo on the front of the bike, have a trail figure of less than 45mm. Mechanical Trail (Front Normal Trail), describes the distance between the point where the front tire contacts the ground and the steering axis, measured perpendicular to the steering axis.
What is a boost fork MTB?
What is Boost? Boost is the latest and greatest axle platform which all performance mountain bike frame and fork manufacturers are adopting. Boost widens the rear axle by 6mm and the front axle by 10mm. So what does Boost do for you? A wider axle means that the spacing between your hub's flanges can be increased.
