How to Convert a Threaded Headset to Threadless

Old bicycles use threaded headsets to stabilize the fork and steering tube in a static position to the bicycle frame. While the fork pivots left to right, the headset holds the fork tube straight up with no lateral motion. Without a headset, the bicycle's steering is uncontrollable due to the lateral movements. Modern bicycles use threadless headsets that use a vacuum chamber to hold the steering tube in position. This set-up requires less maintenance because less grit and grime penetrate the steering tube. Convert a threaded headset to a threadless using specialized bicycle tools. Expect to take between half to a full day for the project.

Things You'll Need

  • Threadless fork
  • Spacer stack
  • Threadless headset
  • Bicycle work stand
  • Headset press
  • Cone wrench
  • Allen wrenches
  • Pipe cutter
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Instructions

    • 1

      Place the bicycle into the stand. Remove all brake cables from the old fork, as well as the brakes, with Allen wrenches. Insert a 5-mm Allen wrench into the center hex screw on the steering tube top and turn until the cap and screw come out.

    • 2

      Pull the old fork out of the bike. Clean out the inside of the steering tube on the frame.

    • 3

      Place the bottom cup of the threadless headset onto the steering tube on the frame. Insert the new fork into the bike. Measure twice, cut once. Determine the height of the steering tube, mark it, then cut the fork's tube to your marked height using the tube cutter or pipe cutting tool.

    • 4

      Grease the fork tube and push the needed spacer rings over it to accommodate the height. Push the top of the threadless headset onto the top of the steering tube and fork tube.

    • 5

      Seal the headset cup using the dedicated headset cup tool. Press to make the airtight seal. Reassemble the brakes to the fork and run the cable along the fork's cable guides.

    • 6

      Screw the brakes onto the new fork and run the cables back up the fork to your liking.