The FSA Flowtron Dropper Post
Ride Smarter, Descend Harder, and Finally Feel in Control — Without Paying $300 for a Dropper Post
Retail: $281 | Your Price: $99.97
Choose Your Size Below
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FSA FLOWTRON MTB DROPPER SEATPOST 30.9mm 150mm Travel Flat Bar Remote New in Box
Regular price $99.97Regular priceUnit price / per$281.00Sale price $99.97Sale -
FSA FLOWTRON MTB DROPPER SEATPOST 31.6mm 125mm Travel Flat Bar Remote New in Box
Regular price $99.97Regular priceUnit price / per$281.00Sale price $99.97Sale -
FSA FLOWTRON MTB DROPPER SEATPOST 30.9mm 175mm Travel Flat Bar Remote New in Box
Regular price $99.97Regular priceUnit price / per$281.00Sale price $99.97Sale -
FSA FLOWTRON MTB DROPPER SEATPOST 31.6mm 175mm Travel Flat Bar Remote New in Box
Regular price $99.97Regular priceUnit price / per$281.00Sale price $99.97Sale -
FSA FLOWTRON MTB DROPPER SEATPOST 31.6mm 150mm Travel Flat Bar Remote New in Box
Regular price $99.97Regular priceUnit price / per$281.00Sale price $99.97Sale -
FSA FLOWTRON AGX DROPPER SEATPOST 27.2mm 100mm Travel Drop Bar Remote New in Box
Regular price $99.97Regular priceUnit price / per$281.00Sale price $99.97Sale
30.9mm x 150mm | 30.9mm x 175mm | 31.6mm x 125mm |
31.6mm x 150mm | 31.6mm x 175mm | 27.2mm x 100mm |
Dropper Post Size Guide
Step 1: Seat Tube Diameter (mm)
This must match your bike’s seat tube exactly. Most common sizes are 27.2mm, 30.9mm, and 31.6mm. You can usually find this printed on your current seatpost near the bottom. If not, use a digital caliper or ruler to measure the inside diameter of your seat tube.
Step 2: Travel Length (dropper movement in mm)
This determines how far the seat can drop. General tips:
- 💡 100mm: Ideal for gravel riders or smaller frames with limited insertion depth
- 💡 125mm–150mm: Great all-rounder for trail and all-mountain riders
- 💡 175mm: Best for aggressive riders, taller riders (5’10” and up), or those riding steep descents
Quick Rules of Thumb:
- If you’re under 5'7": consider 100–125mm
- Between 5'7" and 6'0": 125–150mm is safe
- Over 6'0": 150–175mm if your frame allows
Still not sure? Click here to message us — we’ll help you choose the right size fast.
Not Sure It’ll Fit? Not a Problem.
Choose Your Size Below
30.9mm x 150mm | 30.9mm x 175mm | 31.6mm x 125mm |
31.6mm x 150mm | 31.6mm x 175mm | 27.2mm x 100mm |
Dropper Post Size Guide
Step 1: Seat Tube Diameter (mm)
This must match your bike’s seat tube exactly. Most common sizes are 27.2mm, 30.9mm, and 31.6mm. You can usually find this printed on your current seatpost near the bottom. If not, use a digital caliper or ruler to measure the inside diameter of your seat tube.
Step 2: Travel Length (dropper movement in mm)
This determines how far the seat can drop. General tips:
- 💡 100mm: Ideal for gravel riders or smaller frames with limited insertion depth
- 💡 125mm–150mm: Great all-rounder for trail and all-mountain riders
- 💡 175mm: Best for aggressive riders, taller riders (5’10” and up), or those riding steep descents
Quick Rules of Thumb:
- If you’re under 5'7": consider 100–125mm
- Between 5'7" and 6'0": 125–150mm is safe
- Over 6'0": 150–175mm if your frame allows
Still not sure? Click here to message us — we’ll help you choose the right size fast.
-
Become Unstoppable
The Flowtron is for those ready to level up. Those who want to go from the one holding up the group to the one leading the charge. What once felt intimidating will now feel exhilarating.
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Zero To Hero
The Flowtron is a confidence game changer. Taking you from zero to hero with a feeling of mastery over your bike. Fear will be replaced with an addictive mix of confidence and control.
Ships in One Day From the U.S. 🇺🇸
- All Orders Shipped Within One Business Day From Crosslake Minnesota.
- Instant Tracking On Shipment
- Average Delivery: 2–4 Business Days
Over 120,000 Positive Reviews
Shop Now!
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FSA FLOWTRON MTB DROPPER SEATPOST 30.9mm 150mm Travel Flat Bar Remote New in Box
Regular price $99.97Regular priceUnit price / per$281.00Sale price $99.97Sale -
FSA FLOWTRON MTB DROPPER SEATPOST 31.6mm 125mm Travel Flat Bar Remote New in Box
Regular price $99.97Regular priceUnit price / per$281.00Sale price $99.97Sale -
FSA FLOWTRON MTB DROPPER SEATPOST 30.9mm 175mm Travel Flat Bar Remote New in Box
Regular price $99.97Regular priceUnit price / per$281.00Sale price $99.97Sale -
FSA FLOWTRON MTB DROPPER SEATPOST 31.6mm 175mm Travel Flat Bar Remote New in Box
Regular price $99.97Regular priceUnit price / per$281.00Sale price $99.97Sale -
FSA FLOWTRON MTB DROPPER SEATPOST 31.6mm 150mm Travel Flat Bar Remote New in Box
Regular price $99.97Regular priceUnit price / per$281.00Sale price $99.97Sale -
FSA FLOWTRON AGX DROPPER SEATPOST 27.2mm 100mm Travel Drop Bar Remote New in Box
Regular price $99.97Regular priceUnit price / per$281.00Sale price $99.97Sale