What is the ratio adjustment function that changes lever touch?
"Ratio" refers to the "proportion" calculated from the pivot point, the position where the finger is applied (Input Point), and the part that pushes the piston (Application Point).
By adjusting the distance from the pivot to the Application Point, you can change lever stroke and lever touch. This is the "ratio adjustment function." (Adjustment range: up to 2mm)
| Pivot-to-Application Distance [Short] |
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| Stroke: Longer Lever Touch: Softer |
| Pivot-to-Application Distance [Medium] |
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| Stroke: Standard Lever Touch: Standard |
| Pivot-to-Application Distance [Long] |
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| Stroke: Shorter Lever Touch: Firmer |
| Pivot-to-Application Distance [Short] |
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| Pivot-to-Application Distance [Long] |
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In urban areas with frequent stop-and-go traffic or situations requiring delicate brake control, you can reduce the ratio for softer lever touch. For winding roads or circuits where direct braking is desired, increase the ratio for firmer lever touch. Adjust according to the situation.
Lever Ratio
| Pivot-to-Input | Pivot-to-Application | Lever Ratio |
| 140mm | 16mm | 8.75 |
| 16.25mm | 8.62 | |
| 16.5mm | 8.48 | |
| 16.75mm | 8.36 | |
| 17mm | 8.24 | |
| 17.25mm | 8.12 | |
| 17.5mm | 8.00 | |
| 17.75mm | 7.89 | |
| 18mm | 7.78 |
| Pivot-to-Input | Pivot-to-Application | Lever Ratio |
| 140mm | 18mm | 7.78 |
| 18.25mm | 7.67 | |
| 18.5mm | 7.57 | |
| 18.75mm | 7.47 | |
| 19mm | 7.37 | |
| 19.25mm | 7.27 | |
| 19.5mm | 7.18 | |
| 19.75mm | 7.09 | |
| 20mm | 7.00 |
For optimal master cylinder selection when combined with a caliper, please refer to the following page.
Compatibility Calculation
