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  1. apeincalifornia on

    Ahh the Centurion Ironman classic bike, this colorway and the turquoise/white are always great to see

  2. gunkopopfigurine on

    Use them like airplane flaps: tilt up to push you down for more traction, or tilt down to push you up to go faster. Simple physics.

  3. PM_ME_SHIMPAN on

    That is a friction shifter. You use it to increase/decrease the friction

  4. gumption_boy on

    One side gets angled back, the other side gets removed and you put a bell there

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