Calculate tire rollout distance, circumference, or revolutions from two known values with inch or millimeter units by entering any two fields.
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Tire Rollout Formula
Tire rollout is the distance a tire travels after a set number of complete revolutions. The main formula is:
R = C * N
- R = rollout distance
- C = tire circumference
- N = number of tire revolutions
If you need to solve for tire circumference instead:
C = R / N
- C = tire circumference
- R = rollout distance
- N = number of tire revolutions
If you need to solve for the number of revolutions:
N = R / C
- N = number of tire revolutions
- R = rollout distance
- C = tire circumference
The calculator converts inches and millimeters as needed. One inch equals 25.4 millimeters. Use the same measuring method for circumference and rollout distance for the most consistent result.
Tire Rollout Reference Tables
These tables help you check common tire measurements and unit conversions.
| Tire circumference | 1 revolution rollout | 10 revolutions rollout |
|---|---|---|
| 60 in | 60 in | 600 in |
| 70 in | 70 in | 700 in |
| 80 in | 80 in | 800 in |
| 90 in | 90 in | 900 in |
| Conversion | Formula |
|---|---|
| Inches to millimeters | mm = in × 25.4 |
| Millimeters to inches | in = mm ÷ 25.4 |
How to Measure Tire Rollout
Mark the tire and the ground at the starting point. Roll the tire forward for the number of revolutions you want to measure. Mark the ground again at the ending point. The distance between the two ground marks is the rollout distance.
For a more accurate result, measure with the tire inflated to its normal pressure and carrying its normal load. Tire growth, wear, and pressure can change the actual rollout.
