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Geometric Definitions

The length between the centre of the bottom bracket and the centre of the juncture between the actual top tube and the seat tube.

The length between the centre of the bottom bracket and the very top of the actual seat tube.

The length between the centre of the bottom bracket and the centre of the juncture between the thoretical horizontal top tube and seat tube.

The length between the centre of the bottom bracket and the top of the seat tube based on a theoretical horizontal top tube.

The angle of this tube off of a vertical 90 degrees . Can be between 72.5 and 75 degrees on road bikes and between 75 and 80 degrees on tri/TT bikes.

The physical distance between each end of the actual top tube where it intersects the seat and head tubes.

The distance between the same two points as above, but based on a theoretical horizontal top tube.

Height of the frame at the centrepoint of the top tube.

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The distance between fork crown (see fork length below) and headset, this length dependent on whether the headset is internal or external.

The angle of the head tube off of a horizontal 90 degrees . Usually between71 and 74 degrees on both road and tri/TT bikes.

Length of the fork between the axle and the crown (crown being the juncture between fork and frame). Length is usually between 365 and 375mm.

Height of the bottom bracket off the ground. The bottom bracket is the part of the frame which houses the crank axle, ie the pedaling axis.

The height difference between the centre of the bottom bracket and a horizontal line drawn through both wheel axles.

Stack is the vertical height between the centre of the bottom bracket and the centre/top of the head tube.

Reach is the horizontal length between the centre of the bottom bracket and the centre/top of the head tube.