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Dropbar X Ambition
Dropbar X Ambition

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Bike Description & Terrain

Is your size or color sold out? Head to the Flatbar X Ambition page and see about our Flatbar to Dropbar conversion service. We'll switch any Flatbar model to Dropbar for you.

Ambition helps motivate us. It helps us strive for more and reach new goals.

The X Ambition is built for more. More miles, more adventures, more smiles! You may know the Poseidon X and the X Ambition is the more improved version. We focused on improved comfort with a more upright riding position and a new saddle design. We increased braking power by adding the same brakes as the Redwood and completed the build with 700 x 40 Kenda Happy Medium tires for good speed on the road and grip on gravel.

X Ambition vs Redwood Comparison

Difference between the standard X and the X Ambition: We get this question every so often so we figured we'd explain a little further. The X Ambition offers a more upright seated position which is more comfortable and upright (see image below). The X Ambition offers stronger brakes like our Redwood model. We offer a newer comfort forward saddle which may work better for more riders across the board. The X Ambition also comes with 700 x 40 tires which gives the ride a little more of a plush ride feel but the tread pattern allows this bike to accel on dirt and pavement.

Watch a video comparison from the Bike Sauce here.

Road to Trail

Road to Trail

Sizing Specifications

Full Specifications


6061 Double Heat Treated Aluminum (lifetime warranty). Uses an IS 42/52 Headset.

Seat Post

27.2 Alloy


Full Carbon




Microshift Advent X.


Microshift Advent X.

Handlebars and Stem

Poseidon Adventure Handlebars 46cm Wide 24 degree flare.
STEM: 31.8 Diameter with +\- 7 Degrees. Small- 90mm, Medium- 100mm, Large ,XL and XXL- 110mm


700 x 40 Kenda Happy Medium

Brake Levers

Dropbar Microshift Advent X Short-Pull.


700c Quick-Release Clincher Wheels. 32h rims with hub spacing of 100mm (front) and 135mm (back). 19mm inner rim width, we recommend a tire range of 700x25-42 on the X frames.

Rear Derailleur

Microshift 10-Speed Advent X with Clutch.

Bottle Cage Boss

3 on the size Small, 4 on sizes M, L, and XL. 2 on each side of the fork with a load capacity of 3.5lbs.


MD-C550 Mechanical Flat Mount Brake Short-Pull Calipers.


Prowheel Charm 170mm Crankset with 38t 104 BCD Narrow-Wide Chainring.

Disc Rotor

160mm Tektro



Bottom Bracket

68 x 110.5 English Threaded Square Taper.


11-48 10-speed Microshift Advent X.

Video Reviews

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Customer Reviews

Based on 431 reviews
Emmanuel Andres
Simple and Unbelievable!

Simply amazing. This bike really just begs for you to explore. The riding is butter, the turning is extremely nimble, and the possibilities nearly endless. The drop bar X’s design is extremely comfortable , the shifting is amazing, and the speed is CRAZY! Once you really get going you absolutely don’t want to stop. Riding this isn’t a workout, it’s an experience like floating on clouds. And the build quality is just the greatest; absolutely NO corners cut, half-jobs, overlooks, NOTHING! The Poseidon crew really put their love and passion into this bike and it shines so bright it might even blind you. The Dropbar X Ambition is a strong welcome for new and old riders looking to dominate or cruise their environment. My only critique is that I can’t rate this bike 10/10 stars! Amazing work!

Timothy Tollefson
this much fun should be illegal

I'm no mechanic - actually don't know if my tires are tubeless or how to change one if needed - but the out of box setup was easy and quick. with over 2,000 miles of snow, slush, sand, and slick pavement, to rutted roads, rocky singletrack, and banger gravel, this little adventure seeker may just make a rider out of me

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About Poseidon Bikes
Dedicated to Quality & Affordable Adventures
Building The Highest-Value Bikes In-House

Discovery doesn't need to be unattainable and Exploration should be something right out your door. We produce our bicycles in a factory we own and operate to ensure you have an affordable price. We're Breaking the Barrier to Discovery and Adventure so you can experience what so many others have done before us.