As a true all-mountain bike, JEFFSY delivers convincing performance for everything from after-work rides and blasting your favorite single track to epic alpine crossings. Our versatile all-rounder is both an efficient climber and a playful companion for technical descending, high speeds and fun jumps. And JEFFSY features a bottle mount. So if you only have room for one bike in your garage, and that bike has to do it all, JEFFSY is your weapon of choice!
Who's your JEFFSY?
JEFFSY 27 or JEFFSY 29? Depends on what you do with it! When choosing the right wheel size, consider your personal preferences, riding style and favorite terrain.
The JEFFSY 29
The JEFFSY 29 is one of the most aggressive and agile 29ers on the market. The big, 29-inch wheels are responsible for the significant BB drop, which leaves you sitting “in” the bike and feeling confident even when things get heavy. The big wheels also provide excellent traction and grip, while helping you rack up the miles on long rides. On fast descents, the big wheels keep things smooth and help the JEFFSY 29 stay on course even on rough tracks. It all adds up to a bike that is suitable for both rookies and experienced riders.
The JEFFSY 27
You like to play, get steezy and send every jump? In that case, the JEFFSY 27 is the perfect choice. The 27.5-inch wheels are stable, snappy and dynamic in turns. Because the JEFFSY 27 really likes airtime, we’ve given it 160 mm of front travel to ensure you have enough in reserve to really express yourself on the trails.
The JEFFSY is a versatile all-rounder with impressive climbing capabilities and the gravity DNA that all YT bikes share. Thanks to our award-winning V4L suspension technology, it is very sensitive off the top, with good mid-stroke support and plenty of end-stroke progressivity.
This gives the JEFFSY plenty of pop and agility in both the 27.5-inch and 29-inch versions. The JEFFSY wants you to pull up off every little lip, but it also has enough in reserve to give you a feeling of safety in rough terrain and on big jumps. And on the climbs, the ergonomic seated position and the high anti-squat give JEFFSY plenty of drive.
“The JEFFSY is an absolute rocket! This small travel all mountain bike with aggressive geo is fun and exciting no matter where you ride it.“
Thanks to the Flip Chip, the frame’s geometry can easily be adapted to your riding style. In the low position, the head angle is slacker and the BB drop more pronounced, for better stability when pinning it in rough terrain. In the high position, the steeper head angle and higher BB position make for easier climbing and more agility on tighter trails.
Perfectly integrated guards protect the frame against rock impacts and scratches. Made from super-tough and wear-resistant PA 66, the downtube protector is bolted on and can be easily replaced. It is designed to wrap around the bottom bracket and thus provide extra protection for the side walls of the downtube in this critical area. The chain stay and seat stay guards also help keep the noise down, so that the only sound you’ll hear on the trail is that braaaaap! we all love so much.
Race-Specific Advanced Sealing Concept, Axial Lip-Seal (RASCAL)
In addition to the industry-standard internal seals of our high-quality, double-sealed full complement bearings, we use self-developed sealing washers, that protect all suspension linkage bearings and keep water and dirt at bay. Their axial lip seals increase the useful life of the bearings considerably to make sure that every JEFFSY can withstand the burden of heavy Trail-Riding use.
Chainsuck Plate Protection
Should things get a little rough, the inconspicuous chain suck plates protect the frame from damage caused by a dropped chain. This keeps sensitive areas out of harm's way and helps prolong your frame's service life.
The contact surfaces for the integrated headset are preformed directly in the carbon structure. The homogeneity of the material in this area creates the ideal balance of weight, durability and performance. The ZeroStack design with integrated bearings ensures a long service life, while the mounting dimensions allow the use of ZS49 / ZS56 Reach Adjust headsets – pro level adjustability for everybody.
Internal Cable Routing
Developed in-house, details like internal cable routing with built-in cable guides underline our claim to fame in the world of high-quality carbon bikes. For ultimate protection, the cable is almost entirely hidden in the frame, while the perfectly integrated ports and cable clamps make for a super-clean look. Race-ready: the full-length cable guide is held in place by a bolted clamp in just one area, making it easy and fast to swap cables when needed.
V4L / Virtual Four Link
V4L is responsible for providing outstanding small bump compliance that virtually sucks you to the ground as well as great midstroke support to really optimize the use of the available travel. And the nice pop makes sure you can get airborne at a moment’s notice. So you don’t bottom out harshly even after hitting the biggest jumps, the ending stroke spring curve is very progressive. V4L supports you around the sag point, ready to absorb obstacles but without being affected by pedaling forces.