YT Jeffsy CORE 5 29 – Ultimate Carbon Trail MTB 2024
- Delivered today (order Mon-Fri before 12:00, delivery between 17:00 and 22:00)
- Including shipping costs, sent by klbtheme.com
- Pick up at a klbtheme.com collection point is possible
- 30 days to change your mind and free returns
- Day and night customer service
Description
YT Jeffsy CORE 5 – 29″ Ultra Modulus Carbon Flagship Trail
The YT Jeffsy CORE 5 is a surgical precision tool designed for riders who demand the absolute pinnacle of mountain bike technology and uncompromising all-mountain performance. Built on the flagship ultra modulus carbon frame, this 29-inch masterpiece utilizes the refined V4L suspension system and the revolutionary XX Transmission to deliver a ride experience that is as light as it is indestructible. This elite setup excels on technical alpine singletrack and aggressive trail center loops, making the YT Jeffsy CORE 5 the ultimate choice for those who view every steep descent as a high-speed masterclass in technical trail performance.
Key Features of the YT Jeffsy CORE 5
- Ultra Modulus Carbon: YT’s most advanced carbon layup for maximum weight savings and elite-level stiffness.
- SRAM XX Transmission: The world’s premier wireless T-Type system for flawless shifting under full load.
- Fox Factory Suspension: Gold Kashima coating on the 36 fork and Float X shock ensures buttery smooth trail action.
- Synthesis Carbon Wheels: Tuned Crankbrothers carbon rims provide front-end compliance and rear-end stiffness.
- Code Ultimate Stealth: Top-tier braking power with refined lever modulation and a clean, modern cockpit aesthetic.
- Hangerless Interface: Direct-mount drivetrain increases strength and eliminates derailleur alignment issues.
- 150mm/145mm Travel: Perfectly balanced platform designed for high-speed efficiency and aggressive trail dynamics.
- Industry Nine Hubs: High-engagement performance for instantaneous power transfer on technical climbs.
- V4L Kinematics: Virtual 4-Link suspension provides incredible mid-stroke support and bottom-out resistance.
- Threaded Bottom Bracket: Standard 73mm shell allows for simple, creak-free maintenance and longevity.
Chassis Construction & Geometry
- The ultra modulus carbon layup ensures the frame handles the highest G-loads while maintaining elite-level structural integrity.
- A threaded bottom bracket interface provides a creak-free experience and simplifies long-term mechanical service tasks.
- Integrated dual-density frame protection shields the high-modulus downtube from harsh rock strikes and high-velocity debris.
- The structural integrity of the YT Jeffsy CORE 5 ensures every watt of energy translates into forward momentum during sprints.
- Refined all-mountain geometry performance features a 65-degree head angle specifically tuned for high-speed descending confidence.
Suspension Kinematics & Trail Dynamics
- The V4L suspension system creates a unique leverage curve that provides buttery smooth small bump compliance.
- Fox Factory shocks with Kashima coating offer the most sensitive response to high-frequency trail chatter for maximum traction.
- The progressive leverage ratio ensures that the rear travel feels virtually bottomless on mid-sized trail features.
- The 29-inch platform provides incredible rollover capability that carries speed through the rowdiest all-mountain terrain.
- Optimized anti-squat ensures that the 145mm of travel doesn’t compromise efficiency during high-torque pedaling efforts.
Drivetrain & Precision Componentry
- The SRAM XX Eagle Transmission features the revolutionary hangerless interface for maximum durability and perfect alignment.
- Stealth braking aesthetics from the Code Ultimate calipers allow for a cleaner cockpit and optimized hose routing.
- The hangerless drivetrain mounting system ensures that the derailleur is always perfectly indexed to the cassette.
- Synthesis tuned carbon wheels offer a unique feel, damping trail vibrations while tracking perfectly in off-camber sections.
- The high-engagement Industry Nine 1/1 hubs provide the reliability needed for professional-level trail riding.
Trail Performance & Climbing Efficiency
- A steep seat angle places the rider in the most efficient position for high-cadence climbing on technical ascents.
- This build provides climbing efficiency without compromise, maintaining traction even on loose, technical uphill sections.
- Precision all-mountain stable handling allows the rider to hold difficult lines through rock gardens with ease.
- The superior 29-inch rollover makes this bike a master of maintaining speed through chunky trail features.
- Optimized anti-squat characteristics ensure the suspension remains active while pedaling through technical terrain.













Fatima Ahmed (verified owner) –
Great quality and quick FedEx shipping to Alaska handled my order perfectly.
Thiago Moon (verified owner) –
Perfect birthday present with top quality materials and prompt delivery.
Ellen Wilkerson (verified owner) –
Search no more because this is the best quality you will find online.
Madilynn Ferguson (verified owner) –
They were so patient with my many questions and never made me feel like I was a bother to them.
Enoch Miller (verified owner) –
Professional service and fast UPS shipping to Kansas for premium products.
Emmanuel Flores (verified owner) –
Very picky but this quality is outstanding and the FedEx shipping was great.
Scarlett Goodwin (verified owner) –
Great packaging quality and a very professional return service that is hard to find in online shops.