Gravity

Gravity Fsx 1.0 FSX 26" Full Suspension Mountain Bike Frame

Name: Gravity Fsx 1.0 FSX 26" Full Suspension Mountain Bike Frame
Brand: Gravity
SKU: Fsx 1.0

★★★★★4.6 (14 reviews)

A rugged 26-inch full suspension aluminum frame with included coilover shock for building a custom trail-ready mountain bike.

$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 full dual suspension mountain bike frame engineered for 26-inch wheels and intended for riders who prefer to hand-pick every component of their trail setup. The front triangle is constructed from 6061 aluminum and uses disc-brake-only mounting, while the rear triangle includes a replaceable derailleur hanger — a practical detail that means a trail mishap won't sideline the entire frame. The suspension platform uses a single-pivot design with a KS CoilOver shock that offers adjustable preload, letting you dial in the ride feel based on your weight and the terrain you plan to tackle.

Out of the box, the frame package includes the rear shock, a headset, and a 31.8mm seatpost clamp, which reduces the parts list for your build. The frame accepts a standard 68mm English threaded bottom bracket and a 27.2mm seatpost, while the 135mm rear dropout spacing is compatible with the vast majority of 26-inch mountain bike wheelsets. For riders looking for an economical way to build a capable trail bike — or to replace an aging frame on an existing 26-inch build — the Gravity FSX 1.0 delivers the essentials without unnecessary complexity.

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

6061 Aluminum

Wheel Size

26 inches

Suspension Type

Full Dual Suspension (Single Pivot)

Rear Shock

KS CoilOver with Adjustable Preload (Included)

Brake Mount

Disc Brake Only

Headset

Included

Bottom Bracket

68mm English Threaded (Not Included)

Seatpost Diameter

27.2mm

Seatpost Clamp

31.8mm (Included)

Rear Spacing

135mm

Pros & Cons

👍 Pros

6061 aluminum construction provides a durable yet reasonably lightweight foundation for a custom build.
Included KS CoilOver rear shock with adjustable preload saves the cost and hassle of sourcing a shock separately.
Replaceable rear derailleur hanger protects the frame from crash damage and is inexpensive to replace.
Standard 135mm rear spacing and 68mm BSA bottom bracket ensure broad compatibility with widely available components.
Included headset and seatpost clamp reduce the number of additional parts needed to complete the build.

👎 Cons

26-inch wheel compatibility limits tire and wheel upgrade options as the industry has largely moved to larger wheel sizes.
Single-pivot suspension design is less sophisticated than multi-link systems found on more advanced frames.
No frame size options are specified, making it difficult to confirm proper fit before purchasing.
The frame is sold without fork, crankset, wheels, or drivetrain, so total build cost will be significantly more than the frame price alone.
Limited brand recognition compared to established mountain bike frame manufacturers may affect resale value.

Frequently Asked Questions

What wheel size is this frame designed for?

The Gravity FSX 1.0 frame is built exclusively for 26-inch wheels and is not compatible with 27.5-inch or 29-inch wheel sizes.

What is included with the frame purchase?

The frame comes with a KS CoilOver rear shock with adjustable preload, a headset, and a seatpost clamp. You will need to supply all other components separately.

What brake type does this frame accept?

This frame has disc brake mounts only — there are no rim brake mounting points, so disc brakes are required.

Is the rear derailleur hanger replaceable?

Yes, the frame features a replaceable rear derailleur hanger, so a bent hanger from a crash or impact can be swapped out without damaging or replacing the frame.

What bottom bracket standard does this frame use?

The frame uses a 68mm English threaded (BSA) bottom bracket shell, which is the most common standard and compatible with a wide range of cranksets.