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Gravity

Gravity Bullseye Monster - Fat Bike Frame & Fork Kit

Start Your Fat Bike Adventure Here Kickstart your fat bike build with the Gravity Bullseye Monster Frame and Fork kit. This comprehensive set provides a high-quality aluminum frame paired with essential components, setting the stage for your custom ride. Specifications: Frame: Alloy 6061...

$199.00*
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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

Start Your Fat Bike Adventure Here

Kickstart your fat bike build with the Gravity Bullseye Monster Frame and Fork kit. This comprehensive set provides a high-quality aluminum frame paired with essential components, setting the stage for your custom ride.

Specifications:

  • Frame: Alloy 6061, disc mount only, TIG welded, replaceable rear derailleur hanger, H2O bosses, rear rack seatstay braze-ons, 170mm symmetrical rear spacing
  • Fork: 26" CrMo FatBike with Threadless steerer 1.125"
  • Tire Compatibility: Accepts 26 x 4.0 tires
  • Rear Spacing: 170mm
  • Front Spacing: 135mm
  • Included Components:
    • Aluminum Frame
    • Steel Rigid Fork
    • Seatpost
    • Seatpost Clamp
    • Headset (Installed)
    • Stem (Installed)

Key Features

Aluminum Frame with Steel Rigid Fork

170mm rear spacing 135mm front spacing

Will Accept 26 x4.0 Tires

Seatpost and Seatpost Clamp Are Included

Headset and Stem are Included and Installed!

Specifications

Frame Material
Aluminum
Fork Material
Steel
Rear Spacing
170mm
Front Spacing
135mm
Compatible Tire Size
26 x 4.0 inches
Included Components
Seatpost, Seatpost Clamp, Headset, Stem

Pros & Cons

👍 Pros

  • Includes an aluminum frame for a balance of strength and lighter weight.
  • Comes with a steel rigid fork, offering durability and direct steering response.
  • Designed with 170mm rear spacing, accommodating a variety of fat bike components.
  • Features 135mm front spacing for compatibility with specific fat bike hubs.
  • Will accept wide 26 x 4.0 tires, providing excellent traction and floatation for diverse terrains.
  • Includes both a seatpost and seatpost clamp, saving you from separate purchases.
  • Comes with a headset and stem pre-installed, simplifying the assembly process for quicker build times.

👎 Cons

  • The frame and fork kit does not include other essential components like wheels, drivetrain, or brakes.
  • The rigid steel fork, while durable, does not offer suspension for absorbing impacts on rougher trails.
  • It is specifically designed for 26 x 4.0 tires, limiting tire size flexibility for different riding styles.
  • Information regarding the frame's specific geometry (e.g., head tube angle, standover height) is not provided.
  • The type of aluminum used for the frame is not specified, which could influence its precise weight and stiffness characteristics.
  • The exact material grade of the steel rigid fork is not detailed.

Frequently Asked Questions

The Gravity Bullseye Monster frame is constructed from aluminum, offering a good balance of strength and weight for a fat bike.
No, this kit includes a steel rigid fork, which provides durability and a direct feel but does not offer suspension.
This kit is designed to accept 26 x 4.0 tires, allowing for excellent floatation and grip on various off-road surfaces.
The rear spacing on this fat bike frame is 170mm, which is a common standard for many fat bike wheelsets.
Yes, both a seatpost and a seatpost clamp are included with the Gravity Bullseye Monster Fat Bike Frame & Fork Kit, streamlining your build.
No, the headset and stem are included and come pre-installed, further simplifying the assembly process for your new fat bike.

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