The new JEFFSY makes light work of both the climbs and the downhills. With 150 mm of RockShox suspension, the JEFFSY 27 CF Pro will lure you out of your comfort zone and let you attack even unknown trails with confidence. The generous reach and slack headangle give you a sense of security and ensure reliable handling even in rough terrain.
The V4L kinematics provide ample mid-stroke support and plenty of end-stroke progressivity, begging you to get airborne. The compact chainstays and the 27“ wheels give JEFFSY its playful character and help you navigate the tightest of turns with ease. To ensure consistent handling across all the frame sizes, we made the chainstays longer on the XL and XXL. The result: JEFFSY lets you truly redefine your riding style.
The JEFFSY 27 CF Pro boasts impressive specifications: the progressive feel of the RockShox Pike RCT3 and the RockShox Super Deluxe RT3 shock ensures you have full control even during big impacts, providing enough travel reserve to deal with fast and rough downhill sections.
SRAM’s wide range GX Eagle drive train offers 12 gears and with 10–50 teeth on the cassette you can tackle both steep climbs and high-speed descents with ease. Because it’s never about pure speed but rather perfect speed, SRAM’s Guide RS brakes give you precise control and reliable stopping power, while e*thirteen‘s TRSr tires deliver superior traction and rolling speed.
FrameJEFFSY CARBON 27,5"
high modular carbonfiber frame, V4L Virtual 4-Link rear suspension, 148x12mm DT Swiss QR Thru axle, down tube/seat stay/chain stay protection
Wheelsete*thirteen TRS Plus
27,5“ x 28mm | 110x15mm | 148x12mm
HandlebarRace Face Turbine R 35
35mm Rise | 800mm
ColorCANDY RED / WHITE
CANDY RED / WHITE
MAGNESIUM WHITE / BLACK MAGIC
Front Tiree*thirteen TRS Plus
27,5" | 2.35
StemRace Face Turbine R 35
Travel front/rear150mm / 150mm
Rear Tiree*thirteen TRS Plus
27,5" | 2.35
GripsODI Elite Motion
V2.1 | Lock On
Frame SizeS / M / L / XL / XXL
CranksetSRAM GX Eagle
175mm | 32T | DUB
Weight*12,9 kg / 28,4 lb
* Weight measured without pedals in frame size S. Due to manufacturing tolerances of the individual components the bike weight may differ +/- 5%
Rear DerailleurSRAM GX Eagle
Seatposte*thirteen TRS Plus
31.6mm | 125mm / 150mm / 170mm Drop
ForkRockShox Pike RCT3
27,5“ | 150mm | 15x110mm | 46mm Rake
ShifterSRAM GX Eagle
SaddleSDG FLY MNT Cutout
YT Custom | Red | White
RT3 | 230x60mm
CassetteSRAM XG-1275 Eagle
10-50T | 12-Speed
BrakesSRAM Guide RS
ROTOR CENTERLINE | 200mm / 180mm
ChainSRAM GX Eagle
Bottom BracketSRAM DUB Pressfit
Tool KitIceToolz Set
Torque Wrench (3NM-10NM; 3-6mm, reset) | Shock Pump (330psi/20.6bar; pressure relief valve) | Allen Key | Anti-Slip Paste
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.
|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 / 450 mm||342 / 450 mm||342 / 450 mm||342 / 450 mm||342 / 450 mm|