It’s finally official: JEFFSY is the brand new Trail Bike by YT Industries. A 29er with 140 mm of travel and of course, packed with a whole lot of gravity potential. For weeks YT was providing one key message to mountain bike magazines and social media channels: #IHATEJEFFSY. Various rumors were floating and even women’s right activists furiously called YT to find out more about JEFFSY.
With JEFFSY, the guys and gals out of Forchheim attack the Trail Bike category and get rid of prejudices regarding 29ers. YT’s latest bike is definitely the most gravity-capable Trail Bike on the market: a downhill-ready geometry, a voluminous but light frame and a compact silhouette with superb specs.
CTO Stefan Willared and his team put in the work of three years to develop JEFFSY. When they started the design for a new bike, it was not their goal to develop a 29er. Their main questions were: What does the perfect Trail Bike even look like? And what is Trail Biking, the YT way? At the beginning, nobody would have thought that they would come up with a 29” bike but they were open to all sorts of different concepts. The guys had one mission on their schedules: Developing a true trail-rocket which is comfortable and smooth to ride on, ready for you to shred hard and still has looks to kill for.
After countless tests and variations, they quickly realized that the larger wheels definitely fit in brilliantly with YT’s gravity genes. However, what does this actually mean?
The Virtual 4 Link suspension technology, which has already proven itself on the TUES and CAPRA is also equipped on JEFFSY’s rear end. The frame has a downhill-capable geometry and JEFFSY already had observers doubting if they are actually looking at a 29er.
The 66,8° head tube angle is one of the most aggressive ones of the Trail Bike category. The low bottom bracket lets you sit directly in the sweet spot of the bike. With the equipped Flip Chip technology, the rider has the option to either ride JEFFSY in a high or low position, the latter responsible for a bigger BB drop and a more aggressive head tube angle. The low stand over height, the wide riser handlebar and the compact chain stays ensure optimal and completely atypical handling for a 29er. YT doesn’t accept any compromises; therefore, the length of the rear triangle is optimized for each frame size. Sounds like JEFFSY is the perfect all-round bike out there.
Check the fact sheet:
Specs
JEFFSY CF Pro
The standout highlights of YT’s top of the line model, JEFFSY CF Pro, are the DT Swiss carbon wheels and the potent FOX suspension components, consisting of the FOX Float DPS Factory shock and the FOX 34 Float Factory fork. The 780mm wide carbon handlebar and the carbon cranks complete this high end build. SRAM’s X01 drivetrain shifts precisely and smooth. In case things get a bit hectic, the Guide Ultimate brakes slow the rider down with authority. The JEFFY CF Pro is the no-holds-barred bike for riders who accept no compromises.
JEFFSY CF Comp 1
YT’s gravity background runs deep in the specs of the JEFFSY CF Comp 1: RockShox’ PIKE RCT3 fork and Monarch RC3 shock are ready to smoothly take on any root nest or rock garden. The wide RaceFace cockpit provides a maximum of control on wild descents and SRAM’s Guide RSC brakes provide ultimate stopping power. The 1×11 drivetrain calmly shifts into next gear.
JEFFSY CF Comp 2
With the JEFFSY CF Comp 2, YT offers a Trail Bike with prime specs. The 2×11 drivetrain allows a wider range of gears to shift through, so there are no excuses for the next uphill section. This carbon bike comes equipped with an entire Shimano XT group that is snappy and reliable, as well as a wide RaceFace cockpit, a RockShox Reverb Stealth, and sturdy 2.4” Onza Ibex tires.
JEFFSY AL Comp 1
The aluminium version, JEFFSY AL Comp 1 also gets a full load of dependable parts. RockShox’ Pike RCT3 and Monarch RT3 get riders through gnarly sections with ease and have your back for racing as well. SRAM’S GX 1×11 drivetrain ensures smooth shifting and the Guide RS brakes slow any rider down when things get out of hand. The 2.4” wide tires by Onza not only look good, but also deliver when it is time to send it through the rough stuff. At 13.5 kg the JEFFSY AL is a weapon for any trail and there are still some bucks left for the next bike trip.
JEFFSY AL Comp 2
For anybody looking for a wider range of gears, the AL Comp 2 with its 2×11 drivetrain is the right choice. The RockShox Pike RCT3 and Monarch RT3 keep things smooth even in the roughest terrain. When it comes to shifting gears and braking, Shimano’s XT group ensures precise shifting, optimal chain line and excellent reliability. Onza’s 2.4” tires are puncture resistant and offer great traction. Naturally, the RockShox Reverb Stealth is part of the stock JEFFSY AL Comp 2 build.
JEFFSY AL
The JEFFSY AL is the entry level trail bike available for a killer price: Even with this model, riders can expect top quality specs: Armed with the RockShox Pike RC and Monarch R the bike is ready for the next adventure. A 2×10 drivetrain has a full range of gears to choose from and Shimano’s SLX brakes bring you to a safe stop when needed. The stock build also includes a RockShox Reverb Stealth, a wide RaceFace cockpit, and tough, reliable Onza Ibex tires.
JEFFSY is the perfect choice for long trips through the woods, alpine and blocked terrain and rough descents. The 29” wheels and their immense drive let you conquer the steepest mountains with ease. Obstacles are a piece of cake due to the larger wheel diameters- uphill as well as downhill.
Hence, JEFFSY is born to rule any trail and offers a whole lot of gravity potential for riders to get wild and rowdy.
Whatever, you're being stubborn and splitting hairs. No one is saying it's exactly like the Stumpy. But it looks a ton like it. Even my wife, when I showed her the Jeffsy said it looked just like mine.