Assembly Video

Important Tips to Avoid Problems:

  • Please be very careful when connecting your display. The black arrows must be aligned or the pins or plug may be permanently damagedA picture containing indoor, close, silver

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  • Make sure you pedals and crank arms are installed correctly. The crank arms must be at 180° from each other. If you put them on at the wrong angle, you may need a crank puller tool to remove them.
  • The left pedal must go on the left. It is reverse thread, carefully screw it in by hand, you must properly align it and then rotate it counter clock wise. Then tighten with a wrench.
  • The right pedal must go on the right. It has a standard thread. Screw it in by hand, it must be properly aligned and should go in easily, rotate clockwise to tighten. Once in, tighten with a wrench.
  • Make sure your fork is on correctly and not backwards (brake caliper and rotor goes on the left side of the bike).
  • Before sliding the fork steerer tube into the headtube, check wire and cable routing. Please compare yours to the video.
  • Before installing handlebars, check wire and cable routing again, you may need to flip (left to right, right to left, front to back, back to front).
  • When you tighten the stem onto the handlebar clamp area, make sure the gap at each bolt is similar size. You should gently tighten the screws in a crisscross pattern making sure the gap is the same at all locations.
  • Do not touch the brake rotors with your fingers. The oil can contaminate them and cause them to be noisy when used.

Fork & Headset Assembly

If you are not familiar with installing this or not familiar with bicycle part names, it may be best to have it assembled by a bike shop. Please watch the assembly video carefully.

As with many bike components, proper installation is important to avoid damage to the bike and to avoid injury while riding the bike. 

Core-5 Upper headset components - Shown in the orientation they should be when installed on the bike.  

Core-5 Lower headset components - Shown in the orientation they should be when installed on the bike.  


1.    Carefully install fork fully, make sure it is seated well with the bottom of the head tube and the lower bearing that is inside the bottom of the head tube. The lower bearings (larger diameter of the 2 ball bearing cages provided) along with a dust cover should be installed in the bottom of the head tube. If they will not stay in place, you can place them on the crown race on the fork. The dust cover would go on the fork first, then the bearings. You can then carefully install the fork steerer tube into the head tube. Make sure the bearings and dust cover sit properly in the lower bearing cup and on the crown race. The fork should be fully installed.

2.    Once the fork is installed through the headtube, place the compression ring on top of the fork steerer tube. The compression ring has a "split" in it. It is not a complete circle.

3.    Slide it down the fork steerer tube, the lip of the compression ring will insert just inside of the bearing when the fork steerer tube is properly centered. This make take some adjustment to get it to sit just right.

4.    Next place the cone spacer or conical spacer on. Make sure the plastic/ring or dust cover is also installed with this. It should fit right on this spacer.

5.    Add remaining spacers on steerer tube.

6.    Put stem on on steerer tube (but do not tighten bolts yet!). Are you handle bars on correct? Are the wires and cables routed properly?

7.    Insert top cap and bolt, carefully tighten the top cap bolt as shown in the video until you begin to feel resistance rotating the fork, at that point you may even back it off a few degrees. Does it the fork turn smoothly? Does the fork shift up and down relative to the head tube? It should not shift up and down relative to the head tube. 

8.    Now you can tighten bolts on stem where it connects to steerer tube. Please be careful and slowly tighten in a criss cross pattern. Do not over tighten or you may strip the stem.

9.    Check to make sure, there is no "play" in the fork. If the fork is properly seated and tightened, the fork should not shift up and down relative to the head tube of the frame.

Final Steps

Assembly Complete? Now is a great time to:

  1. Tune your derailleur. Failure to do this may cause damage to your rear wheel, power cable, derailleur, and derailleur hanger.
  2. Make sure your brakes are well adjusted and tuned.
  3. Double check your cable routing.