**Navigation**

**Sagitta**

The sagitta is the amount of push and pull movement that a bar or link will have as it cycles through its travel. This measurement is only accurate if the bar is parallel to the ground at the half-travel point of the travel.

Note: This calculator is being provided as a courtesy. Air Suspension Design Book will not assume any liability for lengths, angles, or any other information that is provided by our calculators. Furthermore, by using our calculators, you knowingly and freely assume all risks related to the use of these calculators.

**Simple Instant Center**

This is a simple calculator that will allow you to find either line *ab* or *AB* by filling out the other fields with your information.

Note: This calculator is being provided as a courtesy. Air Suspension Design Book will not assume any liability for lengths, angles, or any other information that is provided by our calculators. Furthermore, by using our calculators, you knowingly and freely assume all risks related to the use of these calculators.

**Notch Height**

This is pretty straightforward. Keep in mind that the “Laid Out Height” is based on how low you want the chassis to sit when the suspension is aired out, and the calculated “Notch Height” is measured from the bottom of the frame.

Note: This calculator is being provided as a courtesy. Air Suspension Design Book will not assume any liability for lengths, angles, or any other information that is provided by our calculators. Furthermore, by using our calculators, you knowingly and freely assume all risks related to the use of these calculators.

**Simple Motion Ratio**

Need to know the motion ratio and/or leverage multiplier of a point on a link or arm? This calculator is for you.

**Bag Motion Ratio & SFR**

This calculator will allow you to either choose a target SFR or set a target airbag mounting position and give you the “wheel” measurements based on your given information.

**Shock-On-Link Motion Ratio**

When a shock is installed at any angle besides 90° to the link, the final motion ratio (and by default, the leverage multiplier) will be based on both the install position on the link and the install angle of the shock. The motion ratio will most likely change throughout the travel, so it might be a good idea to calculate this at multiple points of travel to find an average motion ratio.

**Shock-On-Axle Motion Ratio**

If your shocks are mounted directly to the axle, the motion ratio is based solely on the install angle of the shock. Unless the shocks remain at a 90° angle throughout the travel, the motion ratio will change throughout the travel. So, it would be a good idea to calculate this at multiple heights and find an average motion ratio.

**Roll ****Motion ****Ratio**

This calculator is not critical at all, but it will give you a good idea of how much the motion ratio will change when the shocks/bags/links are mounted too narrow on the axle.

**Right Triangle Calculator**

We just love right angle triangles, so we made a calculator of our own that takes the complexity out of others we have seen. Simple input the length of any side, then fill out one more field, and the calculator will populate all the other fields.