How to fix a tube dent in bicycles

Written by michael monet
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How to fix a tube dent in bicycles
Repair abandoned bike frames. (bike image by chrisharvey from

If you like to buy old bikes at bargain prices -- or even recover discarded ones --you've probably encountered a dented frame. Many owners consider a dented tube grounds to abandon a bike altogether. For the savvy cyclist, though, this can be a fun, relatively easy project that will restore a perfectly good vintage bicycle.

Things you need

  • Soap
  • Water
  • Rag
  • White grease
  • Bicycle tube frame blocks
  • Liquid steel
  • Auto body putty
  • Putty knife
  • Car body primer
  • 2 small paintbrushes
  • Masking tape
  • Car body paint

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  1. 1

    Clean the dented area on the tube with soap, water and a rag. Dry it off with a clean rag.

  2. 2

    Grease the tube and the frame block with white grease. Spread the grease over a rag and lubricate the surfaces well.

  3. 3

    Clamp the tube into the blocks tightly. Rotate the frame in the block. Tighten the block slowly as you continue to rotate the frame. The frame will rock back and forth in the blocks, working the dent out.

  4. 4

    Stop when the space between the two sides of the block meet. This is about as round as the tube is going to get in the blocks. The dent should be relatively worked out, but still deeper than the rest of the bike frame.

  5. 5

    Apply auto body putty filler into the dent with a putty knife. Apply just enough to fill the dent and bring it level with the rest of the frame. Let the putty dry for 30 to 45 minutes.

  6. 6

    Prime the frame with your auto body primer. Use spray paint primer or a small paintbrush for an accurate job. Let the primer dry completely.

  7. 7

    Paint the frame with your auto body paint using spray paint or a clean paintbrush. Apply masking tape on any area you wish to avoid painting. Let the first coat dry and, if desired, apply a second coat. Let the frame dry completely before riding.

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