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Gravity Fsx 1.0 26
Gravity

Gravity Fsx 1.0 26" Full Suspension Mountain Bike Frame

★★★★★4.6 (9 reviews)

Build your dream 26" full suspension mountain bike from the ground up with this durable aluminum frame and adjustable rear shock.

$129.95*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Gravity FSX 1.0 is a 26-inch full suspension mountain bike frame built from custom-formed, TIG-welded 6061 aluminum. It uses an oversized bearing CantiBeam link single-pivot suspension design paired with an included KS coil-over rear shock that features adjustable preload. This combination provides a compliant rear end suitable for trail riding, while the aluminum construction keeps weight reasonable for a frame at this price point.

Designed as a platform for custom builds, the frame comes with a headset and seatpost clamp to get you started, but you will need to supply your own fork, bottom bracket, seatpost, wheels, drivetrain, and brakes. It accommodates disc brakes exclusively and features 135mm rear hub spacing. A replaceable rear derailleur hanger is a practical inclusion that can save the frame in the event of a crash or impact. Available in four sizes — 15", 17", 19", and 21" — the FSX 1.0 gives builders the flexibility to match the frame to their body and riding preferences.

Key Features

Disc Brake Mounts

Replaceable Rear Deraileur Hanger

Adjustable Rear Shock Included

135mm Rear Spacing

Seatpost Clamp Included

Headset Included

Quality Aluminum Frame!

Specifications

Frame Material
Custom Formed TIG Welded 6061 Aluminum
Suspension Type
Oversized Bearing CantiBeam Link Single Pivot
Rear Shock
KS Coil-Over with Adjustable Preload
Wheel Size
26"
Brake Mount
Disc Brake Only
Rear Spacing
135mm
Available Sizes
15", 17", 19", 21"
Included
Headset, Seatpost Clamp, Rear Shock

Pros & Cons

👍 Pros

  • Aluminum 6061 construction keeps the frame lightweight yet durable for trail riding.
  • Adjustable preload on the included KS coil-over rear shock lets you tune suspension to your weight.
  • Replaceable rear derailleur hanger saves you from replacing the entire frame after a crash.
  • Headset and seatpost clamp included reduces the number of extra parts you need to source.
  • Available in four frame sizes from 15" to 21" for a wide range of rider fits.

👎 Cons

  • Only compatible with 26-inch wheels, which limits tire and wheelset options as the industry has largely moved to larger sizes.
  • Disc brake only design means you cannot reuse existing rim brake components.
  • Does not include fork, bottom bracket, or seatpost, so total build cost adds up quickly.
  • 135mm rear spacing is standard but not compatible with newer boost-spacing hubs.

Frequently Asked Questions

This frame is designed for 26-inch wheels only and is not compatible with 27.5" or 29" wheel sizes.
No, this is a frame-only package. It includes the rear shock, headset, and seatpost clamp, but you will need to source your own fork, bottom bracket, seatpost, and all other components separately.
This frame supports disc brakes only. There are no cantilever or V-brake mounts, so you will need disc brake calipers and rotors.
The Gravity FSX 1.0 frame is available in 15", 17", 19", and 21" sizes to accommodate a range of rider heights.
It comes with a KS coil-over rear shock featuring adjustable preload, allowing you to tune the suspension feel to your weight and riding style.

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