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Dropbar X Ambition
Dropbar 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 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 455 reviews

This bike is amazing! I have a Trek road bike and hybrid and this is my new favorite bike. It’s super comfortable and pretty fast considering the larger gravel tires.

Rob May
Poseidon Knocks it Out of the Park

As a former bicycle mechanic, here are my thoughts on my new Interstellar Blue X Ambition. First, frame and fork. A good bike build starts with a good frame and this one is awesome. The hydro-formed tubes give the bike a modern look and the paint is very good on mine, this frame would not be out of place on a bike costing three times as much. The fork is also top notch, what can you say bad about an all carbon fork that weighs just a few grams over a pound and looks beefy enough to take anything you can dole out? Poseidon specs the Microshift Advent X for this bike and it's a very good match. The shifting was buttery smooth and dead accurate out of the box, no adjustment needed. The crankset is the only major component that to me is below average, but I haven't had any problems with it. The wheelset is what you would expect on an entry level bike, they work fine but if you have the know how and can true them up after the first ride they will last a lot longer. I found a few loose spokes on mine and the wheel slightly out of true but five minutes with a spoke wrench fixed that. The Tektro brakes don't work very well out of the box but can be adjusted and set-up to work much better. An upgrade to linear brake cables is something you see done to these brakes on Youtube videos. The OEM Kenda tires are a nice match for the bike, I haven't had them on a trail yet but they roll easy on the street. Seat and pedals are often a personal preference and experienced cyclists will use their favorites, but for the beginning rider the supplied components are just fine. For me the handlebars are a little wide, I would prefer a 44cm bar, but I do like the flares. The build was very easy and I didn't have any problems. I had watched all the assembly videos before hand and the most important take away is to unroll the chain! Don't just take off the shipping foam and let it dangle, grab the rolled up chain and unroll it, this made it very easy to install the rear derailleur.

This is one of the most comfortable bikes I've ever ridden, aluminum frames have a reputation for being harsh but with the hydro-formed tubes, carbon fork, and big tires, you will love the ride. Shifting is easy and hills aren't a problem with the ultra low gearing. If you're on the fence about getting an X Ambition, go ahead and pull the trigger. I love it and think you will, too.

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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.