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YT’s JEFFSY path MTB has won some up to date construct specifications for 2025. The JEFFSY CORE vary’s 4 construct choices had been revised and now come with carbon or aluminum body choices for the mid-spec fashions. The top-end fashion sticks with a carbon body and the entry-level motorcycle is to be had in aluminum most effective.
YT now equips the JEFFSYs with Hayes Dominion A4 disc brakes on all however the base fashion, choices for SRAM T-Sort drivetrains, and carbon wheels at the highest-end CORE 4 motorcycle.
YT JEFFSY Key Specifications:
The JEFFSY is a trail-focused MTB, designed to supply balanced functions on each climbs and descents. This mid-travel rig provides 145mms of rear journey, managed by means of YT’s V4L linkage. 150mm forks are stocked on all fashions, however the body can run a 160mm fork. The JEFFSY CORE motorcycles roll on 29” wheels, and YT makes no point out of MX compatibility for those fashions.
The newest JEFFSY carbon frames come with STASH downtube garage, plus an adjunct mount at the underside of the highest tube. The compartment’s garage lid is double-sealed for water resistance and to stay issues quiet. Aluminum fashions don’t get in-frame garage, however they do come with the highest tube accent mount for on-bike equipment.
As for fitments the JEFFSY body provides UDH derailleur hangers and runs Spice up 148mm rear axles. Backside brackets are PF92 on carbon frames, whilst the aluminum fashions use BSA threaded BBs.
A variety of 125-230mm dropper posts are stocked between the other body sizes (except for the CORE 1 which tops out at a 200mm put up). All fashions get YT’s Postman V2 dropper put up with adjustable journey and a 31.6mm diameter.
All JEFFSY frames function a water bottle mount at the down tube simply above the BB. This mount can host YT’s 620ml Thirstmaster 6000 bottle with its side-loading cage. Each carbon and aluminum frames function inside cable routing throughout the entrance triangle, plus chainstay and decrease down tube protectors.
Geometry:
JEFFSY frames are to be had in 5 sizes from small to XXL. This vary must duvet riders from 5’0” to six’8”. A flip-chip within the body provides Top and Low geometry settings… take a look at the chart to peer the diversities between the 2 settings and all figures no longer highlighted under.
Within the Top place, the JEFFSY has a 65.6° head perspective. The seat mast angles vary from 77.5 – 79.2° relying on body dimension. In Low, the steerage perspective drops to 65° and the seat masts slack out to between 76.9 – 78.6°. Achieve numbers don’t seem to be pushing barriers, with a medium body coming in at 455mm (Low) or 462mm (Top) and a big measuring 475/481mm.
YT provides two other chainstay lengths around the dimension vary. S-M-L frames get rear ends measuring 435mm (Top) or 437mm (Low). L-XXL frames get 440mm (Top) or 442mm (Low) chainstays.
Style Lineup:
For entire construct specifications on every fashion take a look at YT’s site. Under is a handy guide a rough spotlight of the JEFFSY CORE lineup’s construct specifications.
JEFFSY CORE 4 CF: $5999
The CORE 4 CF is the highest-end JEFFSY fashion, and it’s only introduced with an ultra-modulus carbon body. This motorcycle will get FOX Manufacturing facility suspension, with a 36 GRIP X2 fork and Drift X rear surprise. The CORE 4 rolls on DT Swiss’ EXC1501 Spline wheels with carbon rims and 240 hubs.
This top-end fashion additionally will get a SRAM X0 T-Sort transmission, Hayes Dominion A4 brakes, and a YT-exclusive Renthal Apex stem and Fatbar handlebar. Weight for the CORE 4 fashion is indexed at 32.18lbs. It’s to be had in Fog Inexperienced or Black Magic Bolt colorways.
JEFFSY CORE 3: $4999 (CF) or $4499 (AL)
The JEFFSY CORE 3 is to be had with both a carbon (CF) or aluminum (AL) body. Some key elements at the CORE 3 come with RockShox suspension, with a Lyrik Final Charger 3.1 fork and Tremendous Deluxe rear surprise. This fashion provides a SRAM S1000 T-Sort transmission.
The CORE 3s include Crankbrothers Synthesis Enduro 2 aluminum wheelsets, Hayes Dominion A4brakes, and the similar YT unique Renthal Apex stem and Fatbar handlebar because the CORE 4 fashion. Body colour choices (carbon or aluminum) are Concrete Gray or Black Magic.
JEFFSY CORE 2: $3999 (CF) or $3499 (AL)
Additionally to be had with a carbon or aluminum body, the JEFFSY CORE 2 comes provided with a Fox Efficiency suspension package deal. Up entrance is a 36 Drift fork, and out again is a Drift X rear surprise. Using the CORE 2 is a Shimano SLX drivetrain with an XT shifter.
You continue to get the Hayes Dominion A4 brakes (on 200mm rotors) in this fashion, reeling in its DT Swiss E1900 wheelset. The cockpit contains YT’s personal handlebar and a Race Face stem. Colour choices for carbon frames are Dust Inexperienced or Black Magic Bolt. Aluminum frames are available Frost Blue or Black Magic.
JEFFSY CORE 1 AL: $2799
The entry-level JEFFSY CORE 1 is to be had with an aluminum body most effective. This motorcycle will get Marzocchi suspension, with a Bomber Z1 fork and Bomber Air rear surprise. Gearing is equipped by means of a Shimano Deore drivetrain, whilst SRAM handles braking with their DB8 mineral oil brakes.
The CORE 1 motorcycle additionally runs Solar Ringle wheels and YT cockpit elements. Body colour alternatives for this fashion are Drip Yellow or Black Magic. YT lists the CORE 1’s weight at 36.37lbs.
All photographs c. YT Industries
The brand new JEFFSY CORE vary is in the stores now. Transport for quite a lot of fashions/sizes/colours is anticipated between March and April generally, with some choices nonetheless TBD.
yt-industries.com
