# How to Calculate Stack Height

Written by ryan hotchkiss
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Stack and reach are required to determine the size of a bicycle frame appropriate for a rider's body when taking into account the length of one's arms, torso and legs. Together, stack and reach equal frame size for bicycle models such as road bikes, mountain bikes, BMX, townies and cruisers. The frame's stack height must be calculated to determine the frame's dimensions. Stack height is the measured vertical distance from the centre of the radius of the bottom bracket to the centre of the radius of the head tube.

Skill level:
Moderately Challenging

### Things you need

• Millimetre tape measure
• Bike stand
• 4-inch bubble level
• Paper
• Pencil

## Instructions

1. 1

Secure the bicycle in the bike stand. Measure the distance in millimetres of the centre of the radius of each wheel from the floor. Adjust the bicycle stand until the centre of both wheels are an equal distance from the floor.

2. 2

Place the bubble level vertically on the right or left side of the seat tube. Adjust the bike stand until the bubble level indicates the bicycle is resting precisely vertical in the bike stand.

3. 3

Measure and record the distance from the centre of the radius of the bottom bracket to the floor. Place the bubble level on the side of the tape and ensure the tape is running precisely vertical from the centre of the radius of the bottom bracket to the floor.

4. 4

Measure and record the distance from the centre of the radius of the head tube to the floor. Place the bubble level on the side of the tape and be certain the tape is vertical from the centre of the radius of the head tube to the floor.

5. 5

Subtract the distance from the centre of the bottom bracket to the floor from the distance of the centre of the radius of the head tube to the floor to determine the stack height.

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