usually:  CAD 4,599.00 CAD 4,199.00

Your discount: CAD 400.00

  • S
    sold out
  • M
    sold out
  • L
    sold out
  • XL
    sold out
  • XXL
    sold out

The alloy rear triangle offers great sensitivity, delivers good progression when it matters and gives you a lot of pop to let you give into your more playful instincts. The generous reach, slack headangle and 150 mm of travel make for a quick and stable ride on the descents. The low standover height and the compact chainstays optimize the handling and ensure agility even in demanding terrain.

As a true all-mountain bike JEFFSY also performs on the climbs: the rear suspension is practically bob-free and the steep seat tube angle lets you gain the summit with ease. To ensure consistent handling across all the frame sizes and to make sure you feel right at home on your JEFFSY, we made the chainstays longer on the XL and XXL. The result: JEFFSY lets you truly redefine your riding style.

Aside from the missing Kashima coating, the 150 mm FOX 34 Float Performance Elite fork and the FOX Float DPS Performance Elite shock want for nothing in terms of performance when compared to the Factory versions. The reason for this are the near-identical damping cartridges which offer excellent responsiveness and enough adjustability to satisfy even the most demanding of racers.

Equipped with Shadow+ technology, Shimano’s easy-shifting XT rear derailleur presents a low profile and reduces chainslap for a quiet and serene riding experience. The shifting performance of the e*thirteen cassette ensures even more fun on the trail: with 9–46 teeth it provides crisp shifting and enough range to tackle both climbing and decending. SRAM’s Guide R brakes with proven 4-pot calipers slow you down reliably and with good modulation, while e*thirteen’s TRS wheels and tires give you the best possible grip.


JEFFSY Carbon 27"

high modular carbonfiber main frame with aluminium rear triangle | V4L Virtual 4-Link rear suspension | 148x12mm DT Swiss QR Thru axle | down tube/seat stay/chain stay protection


e*thirteen TRS

175mm | 32T BOOST


e*thirteen TRS

27,5“ x 27mm | 110x15 mm | 148x12mm


FOX 34 Float Performance Elite

150mm | Fit 4 | 15QRx110 | 44mm Rake

Rear Derailleur

Shimano XT

Shadow Plus | 11-Speed

Front Tire

e*thirteen TRS Plus

27,5" | 2.35


FOX Float DPS Performance Elite

3pos-Adj. | Evol LV | 230X60mm


Shimano XT


Rear Tire

e*thirteen TRS Plus

27,5" | 2.35

Bottom Bracket

e*thirteen BB92





Renthal Apex 35



e*thirteen TRS Plus

9-46T | 11-Speed


Acros AZX-203

High Cap


SRAM Guide R

ROTOR CENTERLINE | 200mm / 180mm


13,3 kg / 29,3 lb

* Weight measured without pedals 2014 - 2019 models in frame size S / Regular | 2020 models in frame size L / Long. Due to manufacturing tolerances of the individual components the bike weight may differ +/- 5%


e*thirteen TRS Plus

31.6mm | S 125mm Drop | M - XL 150mm Drop | XXL 170mm Drop


included / inklusive

The included pedals were not made for demanding trails or racing. That is why we also offer you quality pedals at an attractive price in the shopping cart.


Renthal Fatbar 35

30mm Rise | 800mm



YT Custom | Orange | Grey

Tool Kit

IceToolz Set

Torque Wrench (3NM-10NM; 3-6mm, reset) | Shock Pump (330psi/20.6bar; pressure relief valve) | Allen Key | Anti-Slip Paste


ODI Elite Motion

V2.1 | Lock On

Frame Size

S / M / L / XL / XXL




Progress means change. In the case of the new JEFFSY 27, the changes are relatively small but the improvements are still noticeable. For an even better ride, we have given the new JEFFSY 27 longer reach and a slacker headangle. This has a calming effect on the bike and gives you more control when things get steeper and faster, the long reach helping JEFFSY stay on track and making sure even taller riders can sit “in” the bike.

To apply YT’s Tailor Made concept also to the new JEFFSY, we’ve significantly shortened the seat tube and introduced an XXL size. This gives you the choice between two or even three frame size in order to adapt the reach measurement to your riding style and preferences. To ensure consistent handling across the frame sizes, we’ve made the chainstays longer on the XL and XXL, while the integrated Flip Chip lets you further adapt the bike’s geometry to suit your technique and terrain. Run it in the low position to slacken the headangle and lower the BB for fast and rough terrain, or switch to the high position to raise the BB for better clearance and more fun on the climbs.

Sizes   S   M   L   XL   XXL  
A Toptube length  566 mm 589 mm 612 mm 635 mm 658 mm
B Reach  425 mm 445 mm 465 mm 485 mm 505 mm
C Stack  596 mm 605 mm 614 mm 623 mm 632 mm
D Seattube length  395 mm 415 mm 435 mm 460 mm 485 mm
E Chainstay length  432 mm 432 mm 432 mm 437 mm 437 mm
F Headtube angle  66 / 66,5 ° 66 / 66,5 ° 66 / 66,5 ° 66 / 66,5 ° 66 / 66,5 °
G Seattube angle (eff.)   76,5 / 77 ° 76,5 / 77 ° 76,5 / 77 ° 76,5 / 77 ° 76,5 / 77 °
H BB Drop   16 / 8 mm 16 / 8 mm 16 / 8 mm 16 / 8 mm 16 / 8 mm
I Wheelbase  1164 mm 1188 mm 1212 mm 1241 mm 1265 mm
J Headtube length  110 mm 120 mm 130 mm 140 mm 150 mm
K BB height  342 / 350 mm 342 / 350 mm 342 / 350 mm 342 / 350 mm 342 / 350 mm

Warning! The maneuvers shown were done with professional riders on a closed course. Please do not attempt.

The bikes pictured may differ in certain details from the stock model and may feature optional equipment available at extra cost. Any information about delivery, appearance, dimensions and weights of bikes is provided without obligation and is subject to errors as well as printing and typing mistakes; furthermore we reserve the right to make any changes. No rights can be derived from incorrect information.