Gravity Basecamp 3.0 Mountain Bike Frame Set - 26

Gravity

Gravity Basecamp 3.0 Mountain Bike Frame Set - 26" Wheel

Name: Gravity Basecamp 3.0 Mountain Bike Frame Set - 26" Wheel
Brand: Gravity
SKU: Basecamp 3.0

★★★★★4.8 (8 reviews)

26 Inch

Build your dream 26" mountain bike from the ground up with this aluminum frame set featuring a lockout-equipped SunTour suspension fork.

$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

The Gravity Basecamp 3.0 Mountain Bike Frame Set provides a solid foundation for anyone looking to build a custom 26-inch mountain bike without paying for a brand-name frame. The frame is constructed from 6061 aluminum with TIG-welded, hydroformed tubes, striking a balance between weight savings and structural rigidity. Its gloss black, unbranded finish keeps the aesthetic minimal and allows builders to personalize the look. The frame is designed exclusively for disc brakes and uses standard 135mm rear and 100mm front hub spacing, ensuring broad compatibility with readily available wheel sets.

What sets this frame set apart from a bare frame purchase is the inclusion of the SunTour XCT V3 suspension fork, which offers 100mm of travel along with preload adjustment and an advanced lockout mechanism. This fork alone can cost a significant portion of a budget build, so having it bundled adds real value. The kit also includes a standard 1 1/8" headset and a 31.8mm quick-release seat clamp, reducing the parts list for your build. You will still need to source a 27.2mm seat post, a 68mm English threaded bottom bracket, wheels, tires, drivetrain, brakes, handlebars, and stem to complete the bicycle. This frame set is best suited for trail and recreational off-road riding rather than aggressive downhill use.

Key Features

Frame and Fork Only

Designed for 26 Inch Wheels

Gloss Black Color

Designed for Use with Disc Brakes

Includes Standard 1 1/8 Headset

SunTour XCT V3 long travel, preload, advanced LOCKOUT Included

Needs 27.2mm Seat Post and 31.8mm Seat Clamp

135mm rear Spacing and 100mm Front Spacing

Will require 68mm English Threaded bottom bracket

Specifications

Frame Material

6061 Aluminum, TIG Welded, Hydroformed Tubes

Fork

SunTour XCT V3, 100mm Travel, Preload Adjust, Lockout

Wheel Size

26 Inch

Color

Gloss Black (Unbranded)

Headset

Standard 1 1/8" (Included)

Bottom Bracket

68mm English Threaded (Required, Not Included)

Seat Post Diameter

27.2mm (Required, Not Included)

Seat Clamp

31.8mm Quick Release (Included)

Rear Spacing

135mm

Front Spacing

100mm

Brake Compatibility

Disc Brakes

Pros & Cons

👍 Pros

Includes a quality SunTour XCT V3 suspension fork with lockout and 100mm of travel, saving a significant separate purchase.
6061 aluminum frame with hydroformed tubes provides a lightweight yet durable foundation for a custom build.
Unbranded gloss black finish gives the bike a clean, understated look without prominent logos.
Standard hub spacing and bottom bracket threading make sourcing compatible components straightforward.
Headset and seat clamp are included, reducing the number of small parts you need to source separately.

👎 Cons

Sold as frame and fork only, so the total cost of a complete build will be significantly higher once all components are added.
Only compatible with 26-inch wheels, which limits tire and wheel upgrade options compared to newer 27.5" or 29" standards.
No indication of frame size options, which may make it difficult to ensure a proper fit for all riders.
The 27.2mm seat post diameter is narrower than the 30.9mm or 31.6mm used on many modern dropper posts, limiting dropper compatibility.
Does not include a rear derailleur hanger, so compatibility with your preferred drivetrain should be verified before purchase.

Frequently Asked Questions

What components are included in this frame set?

The set includes the 6061 aluminum frame, SunTour XCT V3 fork with 100mm travel and lockout, a standard 1 1/8" headset, and a 31.8mm quick-release seat post clamp. You will need to supply your own seat post, bottom bracket, wheels, drivetrain, and brakes.

What size seat post and bottom bracket does this frame require?

The frame accepts a 27.2mm diameter seat post and requires a 68mm English threaded bottom bracket. Both must be purchased separately.

Is this frame compatible with disc brakes?

Yes, the frame and fork are designed for disc brake mounting. It does not support rim brakes.

What are the hub spacing dimensions for this frame?

The rear dropout spacing is 135mm and the front fork spacing is 100mm, which are standard dimensions for 26-inch mountain bike wheels.

Does the fork have a lockout feature?

Yes, the SunTour XCT V3 fork includes preload adjustment and an advanced lockout function, allowing you to stiffen the fork for climbing or paved riding.