Uproc SL:X
Less weight, more fun!
The Uproc SL:X is lightweight, playful, fast and can be ridden around the tightest bends. The riding experience is as natural as on a bike without a motor. You’ll forget you’re on an e-bike. Until the extra power of the motor kicks in and catapults you up the next climb.
The Uproc SL:X at a glance
400 Wh + 250 Wh
Battery capacity
130 / 130 mm
Travel
55 Nm
Torque
29''
Wheels
18 kilograms – superlight riding pleasure
Designed for endless trail rides and plenty of uphill flow, the Uproc SL:X offers you a lot of riding fun. It makes for a playful and lively ride, combining the weight advantages of a mountain bike without a motor with the added power of the motor. With up to 55 Nm of torque, the powerful Bosch Performance Line SX supports your leg power in a natural way. The harder you pedal, the more assistance the motor provides. This allows you to conquer steep climbs with a new level of ease.
The Light-EMTB will captivate you with high-quality features: selected models have an integrated multi-tool in the stem and the practical MonkeyLink interface for the front light. Attach the headlamp to the stem and enjoy an additional trail lap at dusk. The headlight draws power directly from the e-bike battery.
Winner of the Design & Innovation Award 2025
The jury emphasized: “On the trail, FLYER is a winner with a progressive frameset offering a light, fast ride. It offers maximum levels of fun on winding tracks in particular, bringing joy to each and every rider.”
55 Nm – more uphill fun
The compact, quiet and lightweight 2-kilogram “Bosch Performance Line SX motor” reliably delivers power. Up to 600 watts and 55 Nm of torque peak power are possible. The motor provides assistance in a natural way and with low pedal resistance ensures a feeling like on a conventional bicycle.
400 Wh plus 250 Wh – fun all day
A 400-watt-hour battery is integrated in the frame of the Uproc SL:X, which can be supplemented by an external 250-Wh battery. Thanks to the integrated battery and the hence closed down tube design, we minimize the weight of the frame without losing rigidity. The additional battery is included with the Uproc SL:X 8.70 and 9.50 models.
18 kg – really lightweight
Sometimes less is just more. The lightweight carbon frame and the select components allow a weight of less than 18 kilograms. This ensures greater agility, more playfulness, and greater riding pleasure.
The Uproc SL:X in detail
The 130-mm travel provides a direct riding experience and allows you to master any trail with ease. Drops and stone fields are also no problem with the Uproc SL:X. If you love direct and agile riding, the Uproc SL:X will wow you.
The geometry of the Uproc SL:X has been optimized for trail use. A steep saddle angle ensures good uphill properties, the deep bottom bracket provides a lot of control and an integrated feeling in the bike.
The flip chip allows you to tailor the geometry to your wishes. In the low position, the head tube angle is flatter and the bottom bracket is lowered – riding behavior becomes more downhill-oriented. In the “high position,” the head tube angle becomes steeper and the bottom bracket is in a higher position. This makes handling even more agile.
The controller integrated in the upper tube with LED display is directly connected to the wireless remote on the handlebars. This gives you complete control of your e-bike, without frills or distractions. You can access detailed information via the Bosch eBike Flow app.
The Bosch eBike Flow app* offers the following features*:
- Individual assistance levels
- Over-the-air updates
- Activity tracking
- Turn-by-turn navigation and route planning
- Ride screen: using your smartphone as a display
- Anti-theft protection with Bosch eBike Lock
*Optional accessories are required for certain functions.
The special carbon construction makes it possible for the rear to have the desired flex in the right place, without the need to install bearings on the rear. Less stock means less weight and less maintenance.
Always at your fingertips. The practical multi-tool is integrated into the carbon stem and individual cables are guided through the stem directly into the interior of the frame. This ensures a tidy cockpit.
"Our new trail bike should be light, fast and sporty. With the Uproc SL:X, we hit the nail on the head. It is also great fun riding the e-bike on technical trails."
Lukas Frey, FLYER AG Product Development
