(1 customer review)

NEW! 140 Trail | Chromoly Steel Full Suspension Mountain Bike Frame




SKU: 140-Trail-MTB-Frame Categories: ,



*Lead Time Varies between 3-14 weeks! Contact Us for An Estimate*


This is Not a Complete Bicycle – What’s Included:


What’s listed in the drop-down menus that you choose
What’s stated as being included in the specs


New for Summer of 2024!

We went back to our steezy single pivot roots for this one! Fun, slightly progressive and loaded with thrills to ensure your boring trails are given a new lease on life! 73mm BB, ISCG05 welded on, fits the newest 210×55 shocks and ready to dominate anything you throw at it. This frame punches well above it’s weight thanks to modern geometry and chromoly steel construction. Chromoly steel not only provides superior ride quality but durability that other materials just can’t match.

This is a 29″ front wheel and 27.5″ rear wheel machine. Designed around a 150-160mm fork with an ethos of balanced weight in mind, this frame will deliver smiles for miles and rejuvenate your love for mountain biking. Thoughtful geometry and material choices provide a stable, fast and well handling steed. Don’t need 140mm? Short stroke your shock to 50mm and you’ll be rewarded with 130mm of playfulness. Pair that with a 140-150mm fork and you’re ready to tackle flatter terrain with even more ease. We designed this frame for the rider that only needs 1 bike in their quiver but whether you have 2 or 10 others, we are confident this will be your favorite!

Additional information


Custom (We'll Contact You), Medium, Large

Size Chart and Geometry

Geometry & Sizing

Sizing Tip:

The 140 Trail was developed with progressive geometry in mind.

Please feel free to Contact Us for sizing help.

(5’6″-5’11” / 167.64cm-180.33cm)
Size 2 (5’11”-6’3″ /
Reach 460mm 480mm
Virtual/Effective Top Tube Length
618.7mm 670mm
Head Tube Angle
64.5° (160mm Forks)
65° (150mm Forks)
64.5° (160mm Forks)
65° (150mm Forks)
Seat Tube Angle 76.5° (150mm Forks) 76.5° (150mm Forks)
Bottom Bracket Drop 23mm 23mm
Wheel Base 1192.9mm 1212.9mm
Front Center 754.9mm 774.9mm
Seat Tube Length 390mm 400mm
Chainstay Length 438mm 438mm
Headtube Length 120mm 120mm



140 Trail Frame Specs

Frame Weight 9.9lbs (Medium)
Spec: IS42/IS52
Rear Axle Included
Spec: 180mm Length – 12×1.0 Thread Pitch
Derailleur Hanger UDH
Rear Wheel Travel 140mm at 55mm Stroke | 130mm at 50mm Stroke
Rear Wheel Tire Clearance Up To ~27.5×2.4″ Tires vary in size by manufacturer.
Rear Shock 210×55
Shock Hardware 22x8mm Front and 40×8 Rear
Hub Spacing Rear BOOST 148mmx12mm (Axle Included)
Bottom Bracket Standard 73mm BSA Threaded
Forks Steerer Spec Tapered Forks 1.5″ > 1-1/8″
Max Fork Travel 160mm
Seatpost Diameter 31.6mm
Dropper Seatpost Cable Routing Internal
Seat Post Clamp 34.9mm (Included)
Hydraulic Disc Brake Mount Rear IS
Hydraulic Brake Disc Diameter Max (Rear) 203mm (Example Adapter: Magura QM9 IS to PM 203mm Adapter)
ISCG-05 Welded On
Country of Origin
USA with foreign and domestic parts

Why Chromoly?

Why Chromoly?

Chromoly is much stronger than traditional steel and aluminum alloys. Chromoly is the most earth friendly material that we’ve seen besides bamboo that’s being made into bicycles. Studies show that chromoly requires 6-11 times less energy and emissions than competing materials to mine, manufacture and process.

Most people looking to buy our frame will have their minds made up on chromoly steel frames and prefer this material for their next frame but if you’re new to or curious about this amazing material, here are some of the advantages you’ll hear from experienced riders:


Chromoly steel bike frames possess a natural flex that absorbs sounds. While not completely silent when contact is made with rocks or roost, the ride is very stately feeling. Focus on the path ahead, not nuisances.


You’re buying a bike that will stand the test of time with proper care and maintenance. Imagine owning a bike that can be welded and repaired rather than degrade and be thrown away. Most people consider the user-friendly nature of chromoly to be a very wise investment.


Our steel full suspension mountain bike frames are engineered with controlled flex, working with the natural characteristics of heat treated chromoly and stiffening it up where it’s necessary for maximum efficiency. Chromoly tubing for a mountain bike is very thin yet incredibly strong, it has an inherent flex that people strive for in order to reduce vibrations translated to their hands and feet which works to reduce rider fatigue and increase rider comfort. Ride longer, more comfortably and much harder. Slight flex in the rear keeps the wheel planted in sharp hard turns keeping you on two wheels.


Chromoly’s strength to weight ratio rivals that of titanium yet it’s more affordable. Rest easy knowing what you’ve accepted as norm, steel is strong. Imagine a high-tech, lighter weight yet stronger alloy of steel being made into a frame for your next mountain bike. There are pluses and minuses for every known material being made into a mountain bike frame but welded seems, not glued, is something we personal feel is more solid and secure. Metal melted to metal, not piece, glued to piece. Fancy marketing words will lead you to believe other materials are “one solid piece” (“Monocoque”) but research shows that’s misleading, it’s actually multiple segments glued together into one piece which is strong too for only a comparably very short lifespan. Ride safe though, we can’t be held responsible for your new found feel of steel, ride at your own risk, ride responsible.

Color Examples

Color Examples

Best Steel Mountain Bike FrameBest Steel Hardtail Mountain Bike FrameBest Steel Mountain Bike FrameBest Full Suspension Mountain BikesBest Steel 29er Full Suspension Mountain BikeSteel 29er Mullet FrameSteel Hardtail Mountain Bike



Original Owner:

Lifetime Repair
Terms of Warranty

Second Hand Owner:

1 Year Repair
Terms of Warranty

1 review for NEW! 140 Trail | Chromoly Steel Full Suspension Mountain Bike Frame

  1. Kevin Schmenk

    This is such a proper trail bike. As soon as I threw my leg over it, it felt like home. Ferrum nailed the geometry on this frame. I’ve tackled all kinds of terrain and have never felt like I needed more bike. From the extremely efficient power transfer and minimal pedal bob to the way it soaks up landings and drops. This bike can do it all. It climbs like a mountain goat then when you get to the top and make the turn it just goes. It generates speed quickly and maintains it through all the turns and over the rocks and roots. It is extremely stable and controlled in the tech and keeps its composure and makes you forget it’s a 140 bike. It’s very nimble in the corners and can be thrown around in the air easily. The ride is smooth and silent. On jumps it is very poppy and playful. My build is a 150/140 MX setup and has quickly become my favorite bike I’ve owned. If you’re looking for a bike that can handle anything you throw at it and put a smile on your face while doing it, this would be the one.

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