Pavement, Gravel, All Roads Point to The X

FLATBAR X (multiple colors)

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  • Regular price $ 649.99

*FREE SHIPPING Available for this bike within the Continental US


The X is equipped to meet the challenge and grow with you. We wanted simplicity but reliability which is why you have a 38t narrow wide chainring matched with the Advent X 11-48t 10-speed cassette. This gives you the advantage when taking on hills so you feel confident and ready for more. The X is equipped with a full carbon fork which saves weight and offers vibration dampening. The Flatbar X gives you a more upright position but it still retains some of it's sporty responsiveness that you crave for the roads less traveled. The barrier to discovery and adventure has been lowered so that you can see places you never thought you would before. Whether it is the dirt, the gravel, or the road, The Poseidon X is ready for the adventure.

Full Carbon Fork
Lighter in Weight
Read Reviews

Why Flatbar?

If you have never ridden a dropbar handlebar bike or never ridden one in dirt then a flatbar may be a good option for you. It's the handlebar position you have likely known how to ride with for as long as you have been riding. 

Being in a familiar riding position gives you confidence in steering and balancing. The shifting is all done with your thumb so you can maintain two fingers on the brake levers for those sudden stops. 

With the flatbar you are able to fit bags and racks onto the handlebars without worrying about interfering with the handlebars themselves. Or you can leave the bags at home and ride those trails like a rigid mountain bike.

Customer Reviews

Based on 22 reviews
Great bike, super fast shipping

The bike itself is great for the price, same components as a drop bar gravel bike that sells for twice as much. Super fast shipping, bike was packaged very well. Some adjustments necessary but to be expected. Overall would definitely buy a bike from these folks again. Hope you all make some steel frames soon!

Arthur M.
Poseidon X flatbar

Thank you Poseidon for putting out a low budget quality bike that has great bones for upgrades. I’ve only taken the bike on a couple short rides, and it feels pretty darn good so far. I’m a MTB’er and wanted something for riding with my kids around the neighborhood and light trails, camping trips, and occasional gravel rides. So far so good.
The one thing that might be better than their bikes is their customer service! I’ve never had a company respond so quickly to emails. They’re on it!
After doing a ton of research on youtube and online, I decided on the X, and have no regrets at all with this purchase. The fit is good. I’m 5’11” and all torso. I was afraid that getting a medium for my short inseam would be too small for my long reach, but it seems to be good. I’m not cramped and it feels good. The dropbar might’ve been a better fit since the reach is a little longer, but the flatbar is just fine. I’ll ride it like it is for a while and maybe down the road I’ll switch to a dropbar or maybe one of those funky Surly bars. Anyway, no regrets and very happy with my beautiful green Poseidon X! Keep up the good work!

Great bike & easy assembly

I don’t like calling this a “starter bike.” It’s simply a well-rounded do-everything bike that doesn’t indulge in excess. The frame is exactly as robust and light as it needs to be, and the drivetrain is very smooth and was perfectly indexed right out of the box. I put my own pedals and saddle on, so I can’t say anything about the stock ones, and the brakes are a little soft, but not concerning. My ideal cycling routes are longer mixed terrain scenic loops and the occasional bike packing trip, and for that, this bike is perfect.

Quick Bike

This bike is ideal for someone who prefers an aggressive riding position. If you like a more relaxed position, you will likely find the handlebars too low/wide. This isn't a deal breaker, as you can change the handlebars. The seat post also only goes down a certain amount before hitting the welds of the water bottle brackets. This makes reaching the pedals difficult for smaller people. I am 5'9 and had to get the bike shop to switch out the seat post for a shorter one to be able to reach the pedals properly. Again, not a deal breaker, but something to be aware of. It rides a lot like my 20.5 inch bike, so it may not be ideal for smaller people. I got the small size. I'd love an XS size with mustache handlebars for my wife.

Hey Tristan I think there may be a fitting issue here for you because at 5'9 on a size small you should actually have quite a bit of seatpost exposed as I would likely place you on a medium unless you have a very short inseam. Give us a call at the office so we can go over these details and dial you in correctly. Thank you!

Corey Wilson
Good looking bike

A lot of bang for the buck