PNW Components Coast Suspension Dropper Post
Dropper Seatposts
PNW Components Coast Suspension Dropper Post
PNW Components Coast Suspension Dropper Post
The PNW Components Coast Suspension Dropper Post puts a dropper and a suspension seatpost in one part, built for gravel, trekking, and commuter riders. Read the overview
At a glance
- Stanchion Diameter
- 26mm (30.9mm), 22mm steel (27.2mm)
- Suspension Travel
- 40mm tunable air
- Seatpost Material
- 7075 alloy
- Cable and Housing
- Not included with the post
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Overview
What is the PNW Coast Suspension Dropper Post built for?
The PNW Components Coast Suspension Dropper Post puts a dropper and a suspension seatpost in one part, built for gravel, trekking, and commuter riders. A Dual Chamber Hydraulic Cartridge adds 40mm of tunable air suspension to the dropper travel, so you can get the saddle out of the way on descents and still have some give under you on rough roads. You set the air pressure to your weight using PNW's published chart, which runs from 200 to 300 psi.
We carry two versions. The 30.9mm internally routed post has 120mm of drop on a 26mm stanchion and weighs 596g. The 27.2mm externally routed post has 100mm of drop on a 22mm steel stanchion and weighs 622g, made for frames without an internal dropper port. Both use a 7075 alloy body, work with every PNW lever and most cable actuated levers from other brands, and are covered by the PNW Lifetime Warranty. Pick the version that matches your seat tube and how your frame routes the cable.
All the specs
11 specs in 3 groups. Open a group, or expand them all.
MPN CSDP309120IS
Sensors and connectivity1 spec
- Lever Compatibility
- All PNW levers and most cable actuated levers from other brands
Build and box3 specs
- Seatpost Material
- 7075 alloy
- Warranty
- PNW Lifetime Warranty
- MPN
- CSDP309120IS (30.9mm Internal), CSDP272100ES (27.2mm External)
Other details7 specs
- Versions
- 30.9mm, 120mm drop, internal routing; 27.2mm, 100mm drop, external routing
- Suspension Travel
- 40mm tunable air
- Cartridge
- Hydraulic Dual-Chamber Air with adjustable pressure
- Stanchion Diameter
- 26mm (30.9mm), 22mm steel (27.2mm)
- 30.9mm Internal
- 400mm total length, 100mm minimum insertion, 225mm full insertion, 175mm seat collar to center of rails, 596g
- 27.2mm External
- 380mm total length, 122mm minimum insertion, 200mm full insertion, 180mm seat collar to center of rails, 622g
- Cable and Housing
- Not included with the post; included only with the purchase of a lever kit
FAQ
Good questions
Get to know PNW Components
There's more to PNW Components than this one product. Our PNW Components page has the full PNW Components lineup we carry and more about the brand.
Visit the PNW Components page →How much air pressure should I run in the Coast?
PNW recommends 200 to 230 psi for riders 110 to 165 lbs, 230 to 260 psi for riders 165 to 240 lbs, and 260 to 300 psi for riders 240 to 275 lbs.
Which version fits my bike?
Match the diameter to your seat tube and the routing to your frame. The 30.9mm version routes the cable inside the frame and needs 100mm of minimum insertion. The 27.2mm version runs the cable along the outside of the frame for bikes without an internal dropper port and needs 122mm of minimum insertion.
Does the Coast come with a lever?
No. The post works with all PNW levers, including the Drop Bar Lever Kit for drop bar bikes, and most cable actuated levers from other brands. Cable and housing come only with a lever kit.
How often does it need service?
PNW does not set a strict service interval. Service the post when it starts to feel sticky or slow down. PNW describes service as a quick at-home process.
Reviews
What riders say about the Lab
“Paul does a great job. He got my bike I bought from someone there in their town and had it packed and shipped to me in Austin, TX… It got here in perfect condition!”
“Fantastic store. It has everything you may want/need for cycling. Great team. Highly recommend to anyone looking for cycling related things and bike service.”
“I recently got back into biking and wanted to add some things onto my bike. They had most of what I was looking for in shop… I'm really happy to have found them.”
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