Seatposts
Ritchey WCS 1-Bolt Seatpost
400x30.9 · WCS
Compatibility: reviewed
Known specifications can be used by the compatibility engine.
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Evidence and freshness
Technical-source dates and retailer offer checks are separate. A retailer check does not validate compatibility.
Report a correction- Technical review
- Sep 4, 2026
- Compatibility review
- Reviewed Sep 4, 2026
Approved technical sources
- Ritchey official exact current SKU 41055427022ManufacturerSource checked Aug 13, 2026Evidence reviewed Aug 13, 2026
Technical data
Specifications
- Seatpost diameter
- 30.9 mm
- Seatpost length
- 400 mm
- Seatpost offset
- 20 mm