YT Jeffsy Core 4 29 CF 2022 Carbon Frame Only XXL

YT Jeffsy Core 4 29 – 2022 Carbon Frame ONLY (XXL)

This frame is in excellent overall condition. It originally belonged to a customer who found the XXL a touch too large, so we exchanged it for an XL. Since then, it has been safely stored in our warehouse since 2022, time for it to find a new home and get back out on the trails where it belongs.

The YT Jeffsy Core 4 29 is a premium, full-carbon all-mountain/enduro chassis designed for riders who want a playful feel on descents and efficient climbing performance. With 150mm of rear travel, V4L suspension kinematics, and modern geometry, this frame provides the perfect platform for building a high-performance do-it-all trail bike.

Product Details

• Model: YT Jeffsy Core 4 29 (Frame Only)

• Model Year: 2022

• Intended Use: Enduro / All-Mountain

• Wheel Size: 29"

• Rear Travel: 150mm

• Rear Shock Fitment: 210mm x 55mm

• Fork Compatibility: 150mm travel, 44mm offset

• Frame Material: Full Carbon Fiber

  • Carbon front & rear triangles

  • Chainsuck plates

  • Molded PA66 bolt-on downtube protector

  • Molded TPE seatstay & chainstay protection

Specifications

• Head Tube: Tapered (1.125" top / 1.5" bottom)

• Headset: ZS44 upper / ZS56 lower

• Bottom Bracket: PressFit

• Seatpost Diameter: 31.6mm

• Rear Hub Spacing: 12 × 148mm Boost

• Bottle Cage Mounts: Fidlock magnetic mount inside front triangle (also compatible with standard cages)

Frame Features

• V4L (Virtual 4-Link) Suspension Platform
  Efficient, sensitive, and supportive across all terrain.

• Internal Cable Routing
  Clean aesthetics and quiet performance with fully guided internal tubes.

• Flip Chip Geometry Adjustment
  Switch between high/low settings to fine-tune handling for your terrain.

Additional Information
• Geometry adjustable via flip chip in rear shock mount.
• All specifications listed are with a 150mm travel fork with 44mm offset.

Why Buy This Frame?

Premium Carbon Chassis at a Fraction of the Price

The Jeffsy Core 4 is YT’s high-end carbon platform—light, stiff, and built to handle aggressive all-mountain riding. Getting this level of engineering and performance at a frame-only price is exceptional value.

Proven V4L Suspension System

YT’s Virtual 4-Link design delivers unbeatable small-bump sensitivity, supportive mid-stroke efficiency, and controlled end-stroke progression. It climbs efficiently and descends with confidence—true “do-everything” capability.

Ideal Foundation for a Custom Build

With modern standards (Boost spacing, tapered head tube, 31.6mm post, internal routing), this frame is compatible with a wide range of high-performance forks, shocks, drivetrains, and dropper posts.

Excellent Condition & Professionally Checked

This frame has seen minimal use and has been inspected in-house for structural integrity, alignment, and hardware condition. You're getting a top-tier frame ready to build.

Modern, Adjustable Geometry

The flip chip lets you switch between High and Low settings to match your terrain or riding style. Whether you want quicker handling or a more planted feel, the Jeffsy adapts.

Perfect for 150mm All-Mountain / Light Enduro Builds

Pair it with a 150mm fork and a high-quality shock to create a fast, efficient, and playful 29er that’s equally at home on backcountry missions and rowdy bike-park trails.

YT Ride Quality—Light, Strong, and Fast

The Jeffsy platform is known for lively handling, balanced kinematics, and a confidence-inspiring feel on technical terrain. Riders often describe it as “the bike that does everything well.”