Crown / Samducksa ST-25 Tension Grommet
Crown 300-series levers don’t use a metal return spring. Their centring tension comes from a silicone rubber ST grommet, and the number tells you how stiff it is: lower is softer, higher is stiffer. Most Crown levers ship with ST-35; ST-25 gives a low tension feel.
Use it to tune how your lever feels, or to replace a grommet that has worn soft over time.
Tension guide
- ST-15, ST-20, ST-25: low
- ST-30, ST-35: medium (ST-35 is the common stock grommet)
- ST-45: high
- ST-50: extra high
Specifications
| Brand | Crown / Samducksa (South Korea) |
| Type | Silicone rubber tension grommet |
| Tension | ST-25 (Low) |
| Compatible with | Crown / Samducksa CWL 300-series levers (e.g. CWL-303MJ, CWL-309MJ, CWL-309FJ) and Knee Lever Neo |
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