YT Industries has introduced the latest iteration of its Jeffsy Core trail bike lineup, refining the platform with updated frame materials, new component choices and enhanced on-trail performance. Designed to tackle a wide range of terrain, the third-generation Jeffsy continues to evolve while maintaining its reputation for versatility and capability.
Frame and key features
The 2025 Jeffsy Core lineup includes both carbon and aluminum frame options, available in five sizes with 29-inch wheels across the board. The carbon models now feature Stash downtube storage, complete with a double-sealed lid for improved water resistance and noise reduction. Meanwhile, the aluminum versions forego downtube storage but include top tube mounts for carrying essentials.
All models utilize YT’s V4L suspension linkage, delivering 145mm of rear travel, paired with 150mm forks (with 160mm compatibility). Size-specific chainstays—437mm on S-L frames and 442mm on XL-XXL—help maintain balanced handling. A 65-degree head angle keeps steering intuitive, while a 77-degree seat tube angle ensures an efficient climbing position.
Component highlights
The Jeffsy Core 4, the top-tier model, features an ultra-modulus carbon frame paired with a Fox Factory 36 fork and Float X shock, incorporating GripX2 damping for increased traction and chassis control. The bike rolls on DT Swiss EXC1501 carbon wheels, featuring 240 hubs for enhanced durability and engagement. The Maxxis Minion DHF/DHR II tire combo comes in MaxxGrip compound up front for superior traction. Braking power is handled by Hayes Dominion A4 brakes, while SRAM X0 Transmission ensures precise shifting. The build is finished with Renthal cockpit components and the YT Postman V2 dropper post. It’s $8,599.
The Jeffsy Core 3 offers both aluminum and carbon frame choices. Equipped with a RockShox Lyrik Ultimate fork featuring the Charger 3.1 damper and a Super Deluxe shock with HSC/LSC adjustment. It comes with Crankbrothers Synthesis Enduro 2 wheels, a SRAM S1000 Transmission drivetrain and the same Renthal/Hayes cockpit package as the Core 4. The aluminum model is $6,399 while the carbon version is $7,199.
The Jeffsy Core 2, also available in aluminum or carbon, is built around Fox Performance suspension and a Shimano XT/SLX drivetrain. The Hayes Dominion brakes with 200mm rotors, DT Swiss E1900 wheels, and a Race Face stem round out the spec. The aluminum model is $4,999 while…
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