Product news: With the Flyer Uproc SL:X, the light e-MTB market has had another exciting bike added to it today. With 130 mm of suspension travel, a weight of 18 kg and a Bosch SX motor with a 400 Wh battery, the aim is to offer a nimble trail bike for a wide range of uses.
The e-MTB portfolio of the Swiss e-bike specialists from Flyer is getting fuller. The well-known Uproc Equipped with 130 mm travel, 29 inch wheels and the now very popular Bosch SX motor including 400 Wh battery, it positions itself as a nimble trail bike in what has become a highly competitive segment of the market.
Key data flyer Uproc SL:X
Suspension travel: 130 mm
Drive: Bosch SX
Battery pack: 400 Wh (permanently integrated)
Frame material: Carbon
wheel size: 29 inch
Weight from 18,0 kg
Max. Perm. Total weight: 130 kg
Price: from € 5.799
Slim carbon frame with Flex Pivot rear triangle
Clear lines, slim tubes: The carbon frame of the new Flyer Uproc SL:X is impressive and can clearly differentiate itself from the other e-MTBs in the portfolio. What's exciting is the rear end: What initially looks like a classic four-bar linkage is actually a supported single-link linkage that doesn't have a bearing in the rear end. By appropriately designing the struts, the frame flexes in this area so that a deflection is not necessary: fewer bearings in turn mean less weight and less maintenance effort. When it comes to the kinematics, they decided on a tight setup and therefore clearly want to appeal to sporty drivers.
Do-it-yourself mechanics and two-wheeler mechanics will be happy about the classic cable routing through the head tube, which significantly simplifies maintenance work in contrast to the more modern version using the headset. By the way, the color scheme is simple: all models come in a simple, so-called Cast Silver Gloss.
Bosch SX drive with permanently installed battery
The Bosch SX motor is responsible for propulsion and, since its introduction less than a year ago, has now become undoubtedly the most popular light-assist motor. From its maximum torque of 55 Nm, the unit, which weighs around two kilograms, produces a maximum output of 600 watts, which corresponds to that of its big brother CX. In order to achieve this, however, the basic conditions must be right: On the one hand, as a driver, you have to pedal harder than average (the drive determines the average dynamically) and increase your cadence. The motor only provides maximum power at a cadence of over 100. But: Even if you drive the drive normally, it delivers a lot of power for a light-assist motor and is on a par with the equally powerful Fazua Ride 60.
In addition to the good performance, there are typical Bosch features such as the Extended Boost in eMTB support mode and the successful operating concept with LED remote in the top tube and wireless mini remote on the handlebars. You also have the option of adjusting the support levels to your own needs using the Flow app on your smartphone.
The SX motor is powered by a 400 Wh battery in the down tube, which is unfortunately permanently installed for visual and weight reasons. This is a shame, as it severely limits the area of application for many potential buyers in practice. After all: Depending on your driving style, the efficient SX motor gets very good ranges out of the battery. If that's not enough for you, you can use the PowerMore 250 Range Extender, which is already included in the scope of delivery of the two higher-quality equipment variants of the Uproc SL:X.
Very sporty geometry with a long reach
A look at the geometry data shows how Flyer has positioned the new Light E-MTB: Very modern dimensions with a long reach and flat head angle show that a sporty trail bike has been designed for nimble off-road use. The slightly deeper front also fits in with this, which should reward an active driving style. The geometry can also be adjusted slightly using a flip chip.
Geometry Flyer Uproc SL:X (High)
| S | M | L | XL | |
|---|---|---|---|---|
| seat tube (in mm) | 380 | 400 | 440 | 480 |
| Reach (mm) | 440 | 471 | 491 | 521 |
| Stacks (in mm) | 600 | 609 | 618 | 631 |
| Steering angle (in °) | 65.6 | 65.6 | 65.6 | 65.6 |
| seat angle eff. (in °) | 77.9 | 77.7 | 77.6 | 77.4 |
| Bottom bracket drop (in mm) | 30 | 30 | 30 | 30 |
| chainstays (in mm) | 451 | 451 | 451 | 451 |
| Wheelbase (in mm) | 1198 | 1232 | 1257 | 1293 |
| Top tube horizontal (in mm) | 570 | 604 | 628 | 663 |
| head tube (in mm) | 100 | 110 | 120 | 135 |
Geometry Flyer Uproc SL:X (High)
| S | M | L | XL | |
|---|---|---|---|---|
| seat tube (in mm) | 380 | 400 | 440 | 480 |
| Reach (mm) | 435 | 465 | 485 | 515 |
| Stacks (in mm) | 605 | 614 | 623 | 637 |
| Steering angle (in °) | 65 | 65 | 65 | 65 |
| seat angle eff. (in °) | 77.3 | 77.1 | 77 | 76.8 |
| Bottom bracket drop (in mm) | 38 | 38 | 38 | 38 |
| chainstays (in mm) | 453 | 453 | 453 | 453 |
| Wheelbase (in mm) | 1199 | 1234 | 1258 | 1294 |
| Top tube horizontal (in mm) | 571 | 605 | 629 | 664 |
| head tube (in mm) | 100 | 110 | 120 | 135 |
Four equipment variants from 5.799 euros
At market launch, the Flyer Uproc SL:X will be available in four equipment variants between 5.799 euros and 9.999 They will be available for €400. They all share a carbon frame and a Bosch SX drive system with a 250 Wh battery in the down tube. The two top models even come with the PowerMore XNUMX range extender included – a nice touch. The choice of tires is also identical, but this raises some eyebrows: Why Flyer decided to install the low-profile Schwalbe Wicked Will tires front and rear on such a sporty e-trail bike, with the hard rubber compound and the thin Super Ground carcass, will likely remain a Swiss secret.
When it comes to equipment variants, the model 8.70 stands out, which offers a decent price/performance ratio with its Fox Performance chassis, complete XT equipment and DT Swiss wheels. For the top model you have to dig a lot deeper into your pocket, although there are also premium components with Sram Eagle XX transmission gears and Fox Factory chassis. With the two cheaper versions you have to make a few more painful compromises.
When it comes to weight, Flyer only provides information about the top model, which is said to be around 18 kg - a good value. However, the other equipment variants are likely to weigh more.
Fork: X Fusion E-Slide 34 RC
Mute: X Fusion O2 Pro RLX
Circuit: Shimano Deore 12-speed
brakes: TRP Slate Evo
impellers: DT Swiss H552 / Formula hubs
Special features -
Price: € 5.799
Fork: Fox 34Rhythm
Mute: Fox float performance
Circuit: Sram GX Eagle Transmission
brakes: Shimano MT520
impellers: DT Swiss H1900
Special features -
Price: 6999 Euro
Fork: Fox 34 performance
Mute: Fox float performance
Circuit: Shimano XT 12 speed
brakes: Shimano XT M8120
impellers: DT Swiss HX 1700
Special features PowerMore included, MultiTool integrated in the cockpit
Price: € 7.499
Fork: Fox 34 Factory Fit4
Mute: Fox Float Factory
Circuit: Sram XX Eagle transmission
brakes: Shimano XTR M9120
impellers: DT Swiss HXC 1501
Special features PowerMore included, MultiTool integrated in the cockpit
Price: 9999 Euro
First practical impressions with the Flyer Uproc SL:X
As part of a media presentation at the Riva Bike Festival, we were able to gather practical impressions of the new Flyer Light E-MTB in difficult weather conditions. We were particularly pleased with the geometry and rear triangle, which fulfill the designers' promises - the Uproc SL:X is a sporty trail bike whose modern dimensions reward active riders. Anyone who dares to ride with a little pressure on the front wheel can look forward to a surprisingly smooth ride for this suspension travel class.
The Flexlink rear triangle is tight, but also has plenty of reserves even for demanding terrain. Speaking of demanding terrain: the Schwalbe Wicked Will tires were unfortunately overwhelmed here. Especially on the front wheel, the hard rubber compound caused the wet trails around Lake Garda to become slippery again and again.
You can find more detailed impressions in our YouTube video: