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FX Tracklocross Frameset
FX Tracklocross Frameset

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Bike Description & Terrain

The FX is the product of wanting to shred around on dirt with our brakeless fixed-gear frames. We tweaked specific areas of the bike to try to improve common issues that you encounter riding fixed and especially, riding fixed on dirt.

The Poseidon FX has a raised bottom bracket that prevents pedal striking even on the steepest of drops. The head tube angle is slacked so your toe doesn't hit the front tire as easily when turning. This also offers a slightly softer ride on rougher terrain. On the small frame in particular you will see that the head tube angle is slacked the most as toe overlap is a common problem for smaller frames. You can pedal freely even through the tightest of turns on that size.

The FX frame can easily fit a set of 700x40 cross or gravel tires. 

The fork can clear a Tektro R559 Long Reach Rim Caliper.

Frameset includes Frame, Headset, Seatpost Collar, and Fork only.

International Customer? 

Find out about international shipping here:

Box Dimensions are: 39x7x22 (inches)

Box Weight: 10.5lbs


We made this bike to fit your standard fixed gear wheels so a 100mm front and a 120mm rear.

Fits a 68 x 115 square taper bottom bracket. We recommend a square taper bottom bracket and crankset for this build.

All straight returns are subject to a 15% restocking fee and return shipping. The bicycle must be returned in the original packaging (unopened and unridden).

Fixed Gear from Road to Trail

Fixed Gear from Road to Trail

Sizing Specifications

Full Specifications


Aluminum (Lifetime Warranty). Uses an EC 34 Headset.

Seat Post

Fits 27.2




5lbs with uncut steerer.

Handlebars and Stem
Brake Levers
Rear Derailleur
Bottle Cage Boss

2 Available

Disc Rotor
Bottom Bracket

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Customer Reviews

Based on 20 reviews
Sean McCullough

I just swapped my 38mm out for 45mm on 700c and they cleared!

Derek Roesler
Get it

I love it enough that I bought another. First frame is a 700c x 35 winter commuter with studs on front and fenders. Second is a 27.5 x 2” trail bike for fun and exercise. They do the job and I like that they are aluminum. A few more attachment points would be nice. At age 50 I wish the front end was taller and the top tube sloped but that ain’t the style I know. Happy with my purchase and I expect them to last.

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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.