PNW Components Coast Suspension Dropper Post - 30.9mm | 120mm | Internal

PNW Components Coast Suspension Dropper Post 30.9mm 120mm internal routing

PNW Components Coast Suspension Dropper Post - 30.9mm | 120mm | Internal

PNW Components Coast Suspension Dropper Post - 30.9mm | 120mm | Internal

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What is the PNW Coast Suspension Dropper Post built for?

The PNW Components Coast Suspension Dropper Post 30.9mm | 120mm Internal is built for gravel, XC, hardtail, and commuter riders who want both saddle drop and real suspension in one post. A dual-chamber hydraulic air cartridge delivers 40mm of tunable suspension travel underneath 120mm of dropper travel, so washboard gravel, root sections, and pothole-pocked commutes stop punishing your back and joints. Internal cable routing keeps the cockpit clean.

Built around a 7075 alloy body with a 26mm stanchion, the Coast runs an air-tunable system that you set to your weight using the included pressure recommendations (200 to 300 PSI depending on rider weight). It's compatible with all PNW levers and most cable-actuated dropper levers from other brands, and like every PNW dropper, it's backed by a lifetime warranty. Best for gravel grinders, fully loaded bikepackers, XC riders on rigid or hardtail bikes, and city commuters who want to take the edge off cracked pavement without bolting on a full suspension system.

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Specs

MPN: CSDP309120IS

Diameter: 30.9mm

Dropper Travel: 120mm

Suspension Travel: 40mm tunable air

Cable Routing: Internal

Cartridge: Hydraulic Dual-Chamber Air

Stanchion Diameter: 26mm

Seatpost Material: 7075 Alloy

Total Length: 400mm

Minimum Insertion: 100mm

Full Insertion Length: 225mm

Seat Collar to Center of Rails: 175mm

Weight: 622g

Lever Compatibility: All PNW levers; most cable-actuated levers from other brands

Cable and Housing: Sold separately or with PNW lever kit

Warranty: PNW Lifetime Warranty

FAQ

Will my existing dropper lever work with the Coast?: Yes. The Coast is fully compatible with all PNW levers (Loam, Puget, Range, Dropper Lever) and most cable-actuated dropper levers from other brands. Cable and housing are not included with the post itself, only when purchased with a PNW lever kit. If you already have a lever, plan on grabbing a dropper cable and housing kit.

How much air pressure should I run in the suspension chamber?: PNW publishes recommended pressures by rider weight: 110 to 165 lbs runs 200 to 230 PSI, 165 to 240 lbs runs 230 to 260 PSI, and 240 to 275 lbs runs 260 to 300 PSI. A shock pump is required to set the suspension air pressure. Start in the middle of your range and adjust by feel.

What are the dimensions and weight?: The 30.9mm Coast measures 400mm total length with a minimum insertion of 100mm and full insertion of 225mm. The drop travel is 120mm and the suspension travel adds another 40mm of comfort. Total weight is 622g for the internally routed 30.9mm.

How often does the Coast need to be serviced?: PNW does not publish a strict service interval. They recommend a service when the post starts feeling sticky or slows down. The service is straightforward to do at home with the PNW service video walkthroughs, or our service shop can handle it for you.

Best For

Gravel riders, bikepackers, XC and hardtail mountain bikers, and daily commuters who want the comfort of suspension travel combined with the convenience of a dropper post in one component. Perfect for rigid bikes that need a softer ride or any drop bar bike that hits rough terrain regularly.

PNW Components Coast Suspension Dropper Post - 30.9mm | 120mm | Internal Reviews:

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