What is the crown on a bike fork?

Do you need Crown race for fork?

The crown race is the only thing that separates the headtube and fork. Without it, the headtube (of the frame) and fork will sit flush against each other. … Long story short, YOU NEED A CROWN RACE!

What are the parts of a suspension fork?

The suspension fork is comprised of two key components – A spring (air or coil), which gives the fork its…well… spring, and a damper, which controls the compression characteristics and rebound.


  • The Steer Tube is your bike’s connection to the fork. …
  • The Crown connects your fork’s steer tube to its stanchions.

How do you measure the axle and crown on a fork?

Measure from the top of the crown (bottom of Headset race), behind the Arch on the lowers, and to the center of the backside of the Axle. This should give you a measurement accurate within a couple millimeters.

How do I know my bike fork size?

Fork length is usually measured from the bottom of the crown to the center of the axle or where the wheel connects to the blade. This length can be anywhere from 363.5mm to 374.7 mm. A longer fork length will raise up the front end of the bike. A shorter fork length will lower it.

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Should you grease Crown race?

The steerer tube surface and the crown race surface will need to be wiped clean and then you should apply a thin layer of grease to the bearing contact surface of the crown race, and you can set the fork aside.

What is a double crown fork?

2) a double crown fork is mounted on the bottom of the head tube, and the top. this makes it have less flex, but it makes a fork weigh more and you can’t turn the fork as much (the stantions will hit the frame). the lowest travel you will see a double crown is about 170mm.

What is CSU in Forks?

In the PB comments section there have been rumblings recently of forks creaking at the crown-steerer unit (CSU). The CSU is made up of the steerer tube, crown and stanchion tubes in a single-crown fork. These components are all machined separately before being pressed together in the production process.

What does increasing axle to crown length do?

It raises the front end and in doing so slackens the head angle. The rule of thumb is for every 20mm of additional AC length you slacken the head angle by one degree. So you have effectively changed the head angle in the above example by 2 degrees.