For tapered steerers (can be converted to 1 1/8 steerer through purchase of a FS160-5538 crown race).
| material | Alloy |
| headset type | Threadless Zero Stack Cup |
| lower cup | 56mm Flush Cup |
| steerer tube | Tapered 11/8" to 1.5" |
| upper cup | 44mm Flush Cup |
| upper bearing | 36° x 45° 11/8" ACB Sealed Bearing 41.0mm OD |
| lower bearing | 36° x 45° 1.5" ACB Sealed Bearing 51.8mm OD |
| stack height | 12.8mm |
| Material | Alloy |
| Headset type | Threadless Zero Stack Cup |
| Lower Cup | 56mm Flush Cup |
| STEERER TUBE | Tapered 11/8" to 1.5" |
| Upper Cup | 44mm Flush Cup |
| Upper Bearing | 36° x 45° 11/8" ACB Sealed Bearing 41.0mm OD |
| Lower Bearing | 36° x 45° 1.5" ACB Sealed Bearing 51.8mm OD |
| Stack Height | 12.8mm |
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