You feel comfortable on the Jeffsy after just a few metres. The focus on standard geo values makes handling intuitive and easy. The rider sits in the centre and only has to make a small effort to put weight on the front wheel. Thanks to the not too extreme seat angle, the climbing position is not too squat, but balanced. Thanks to the good rolling tyres with Maxxterra compound, the YT can also conceal its relatively high weight of 15.1 kilos without pedals. The bike feels lighter than the pure laboratory values would suggest and moves forward well.
Equipment of the YT Jeffsy Core 3
- Fork: Fox 36 Performance
- Damper: Float Performance
- Gear system: Sram GX Eagle, 1x12
- Bandwidth: 520 %
- Brakes: Sram Code R / 200/200 mm
- dropper post/stroke: YT Postman V2 / 170 mm
- Wheels: DT Swiss M1900
- Tyres: Maxxis Minion DHF/DHRII Exo+ Maxxterra 29 x 2.5/2.4
- max. system weight: 130 kg
- Warranty: 5 years
- Special features: Storage compartment
From the test lab
- Total weight: 15.1 kg without pedals
- Weight of wheels: 5446 g
- Impeller inertia: 4405 kg x cm²
The rear suspension also works efficiently even without a platform and pumps only slightly, which leads to the best uphill grade in this comparison. The only drawback on long rides is the limited bottle cage volume. Unfortunately, a large standard bottle does not fit in the frame. The Jeffsy is also in its element downhill and on flat trails and is simply great fun. In addition to the pleasing cockpit, the predictable handling is impressive. Only the Lapierre Zesty can step up a gear in the pure downhill classification and is even more confident. On the suspension side, the YT offers a little more pop and can be moved more actively through the terrain. This also pays off in the playfulness rating. The rear suspension with Float-X shock offers enough progression and counter-pressure to utilise even small edges to pull away.
The rivals in our all-mountain test:
YT Jeffsy: An all-mountain bike at heart
The YT Jeffsy thus hits the core of the all-mountain category and creates the best compromise between uphill and downhill. In terms of equipment quality, the Jeffsy is positioned in the midfield. Favourable Fox suspension, mechanical GX Eagle drivetrain, DT Swiss 1900 wheels and Code R brakes do their job reliably, but don't exude much extravagance. However, you can get the YT for a really fair price of 3999 euros. Tip: If you want to get the most out of the Jeffsy on the downhill, you should opt for a front tyre with better grip, especially in wet conditions.
Conclusion Peter Nilges, BIKE Test Manager
The YT Jeffsy is hardly lighter than the Lapierre ZestyHowever, thanks to the faster tyres and lighter wheels, it accelerates more efficiently and therefore offers better all-round capabilities. The bike also leaves little to be desired downhill and has the uncomplicated, intuitive handling typical of YT.
