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Flatbar X Ambition
Flatbar X Ambition

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Bike Description & Terrain

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 Flatbar 720mm wide.
STEM: 31.8 Diameter with +\- 7 Degrees. Small- 90mm, Medium- 100mm, Large, XL and XXL- 110mm


700 x 40 Kenda Happy Medium

Brake Levers

Flatbar Tektro Mechanical 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 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.

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Customer Reviews

Based on 137 reviews
Daniel C
Fantastic bike… one gripe

I love my flat bar Ambition X. Perfect for my mostly paved with some gravel trails I frequent. Stylish and super light! My only complaint is that the handlebars can’t be raised. For us older folks used to higher handlebars this would be a very nice addition to make this bike perfect for anyone who frequents paved/light gravel trails. More options to add on for nighttime riding would be great too. All around happy with this purchase though!

Top Tier Customer Service

I originally visited Poseidon to purchase my first drop bar road bike. I can into an issue with the XXL being out of stock and needing a bike quickly to start my training for Ragbrai in July.

I reached out to Luis over email and he offered to provide service on a flat bar of my size and color to turn it into the drop bar. Their flexibility and willingness to go the extra mile so I could start my biking journey showed me the level of care they have for their customers.

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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.