| 11. | The two wheels share a common coil spring running horizontally between the tops of the crank arms.
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| 12. | Chainrings designed for use with multi-chainring crank arms may have ramps or pins to aid in shifting.
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| 13. | The rider's feet are perfectly flat on the pedals with the crank arms perpendicular with the ground.
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| 14. | All your weight is pushing down on that crank arm and twisting that axle and trying to break.
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| 15. | This ground level is the axis on which both the crank arm pivot-point and the slider pin are positioned.
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| 16. | The two wheels per bogie, two crank arms, springs between the cranks and single mounting point are all evident.
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| 17. | Next, from the free point on the crank arm, draw the follower link using its measured or given length.
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| 18. | Q Factor is a function of both the bottom bracket width ( axle length ) and the crank arms.
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| 19. | This position should put the new crank arm at an angle of 180 degrees away from the retracted crank arm.
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| 20. | However, because the stroke of the mechanism only depends on the crank arm length, the follower length is somewhat insignificant.
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