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Gravity

Gravity FSX29 Aluminum Dual Suspension Mountain Bike Frame

★★★★★4.0 (4 reviews)
29 Inch

A full-suspension 29er aluminum frame set with adjustable rear shock and lockout fork — ready to build your custom trail bike.

$199.95*
✓ In Stock on Amazon.com
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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 FSX29 Aluminum Dual Suspension Mountain Bike Frame Set is designed for riders who want to build a custom full-suspension 29er from the ground up. The aluminum frame is engineered around 29-inch wheels, providing the rollover advantages and traction benefits that larger wheels offer on technical terrain. The rear suspension uses a KS coil-over shock with adjustable preload, damping, and a lockout feature — allowing riders to fine-tune the rear end for descending comfort or lock it out entirely for efficient climbing and pavement riding.

Up front, the included XCT 29" suspension fork also features a lockout mechanism, giving riders full control over the bike's suspension behavior. The frame set comes with several components pre-selected for compatibility: a 1 1/8" headset, a 27.2mm seat post, and a 31.8mm quick-release seat post clamp are all included in the box. The frame uses disc brake mounts exclusively and requires a 68mm English threaded bottom bracket, which is sold separately. With four sizes ranging from 15" to 21", the FSX29 accommodates a broad spectrum of rider heights. It's a practical starting point for anyone who wants a dual-suspension 29er platform and prefers to hand-pick their own drivetrain, wheels, and finishing components.

Key Features

Disc Brake Mounts

Replaceable Deraileur Hanger

Comes With Adjustable Rear Shock

135mm Rear Spacing

29 Inch Suspension Fork with LOCKOUT included!

Headset Included! Seatpost Included! Seatpost Clamp Included! Stem Included!

Specifications

Brand
Gravity
Model
FSX29
Frame
29" Full Suspension Aluminum
Fork
XCT 29" Suspension with Lockout
Rear Shock
KS Coil-Over (Adjustable Preload, Damping, Lockout)
Brake Mount
Disc Brake Only
Headset
1 1/8" (Included)
Bottom Bracket
68mm English Threaded (Not Included)
Seat Post
27.2mm (Included)
Seat Post Clamp
31.8mm Quick Release (Included)
Rear Spacing
135mm
Sizes Available
15", 17", 19", 21"

Pros & Cons

👍 Pros

  • Full suspension design with an adjustable KS rear shock offers preload, damping, and lockout tuning for different trail conditions.
  • The included XCT 29" suspension fork with lockout lets you switch between compliant descending and efficient climbing.
  • Includes headset, seat post, and seat clamp — reducing the number of additional parts needed to complete the build.
  • Four frame sizes (15" through 21") accommodate a wide range of rider heights.

👎 Cons

  • The 68mm English threaded bottom bracket is not included, adding to the total build cost.
  • The 135mm quick-release rear spacing is an older standard — many newer wheelsets use thru-axle designs instead.
  • As a frame set only, total build cost will be significantly higher once wheels, drivetrain, brakes, and cockpit components are purchased separately.
  • The aluminum frame and entry-level suspension components add weight compared to higher-end carbon or air-sprung setups.

Frequently Asked Questions

This is a frame set, not a complete bicycle. It includes the aluminum frame, suspension fork with lockout, rear shock, headset, seat post, and seat post clamp. You'll need to supply wheels, drivetrain, brakes, handlebars, and other components to complete the build.
It uses a 68mm English threaded bottom bracket, which is a widely available standard. Note that the bottom bracket itself is not included with the frame set.
The frame is disc brake only — there are no rim brake mounts. You'll need to use disc brakes with the appropriate rotor size for the frame's caliper mounting points.
The rear dropout spacing is 135mm, which is the traditional quick-release standard for mountain bikes. Make sure your rear wheel or hub matches this spacing.
The FSX29 comes in 15", 17", 19", and 21" frame sizes. Size selection depends on your height and riding preferences — generally, shorter riders suit the 15-17" frames while taller riders fit the 19-21" options.

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