New FLYER Uproc SL:X on test – The swiss clock amongst Light eMTBs?

With the brand new FLYER Uproc SL:X, the Swiss bike producer takes the plunge into the sunshine eMTB phase. The Uproc SL:X introduces itself to the world with some promising stats: 130 mm of journey (f/r), 29″ wheels and a Bosch Efficiency Line SX motor paired with a 400 Wh battery. FLYER’s very first gentle eMTB needs to impress above all with a pure journey feeling – however how does it fare in actual life?

FLYER Uproc SL:X 8.70 | Bosch Efficiency Line SX/400 Wh | 130/130 mm (f/r)
18.9 kg in dimension L | € 7,499 | Producer’s web site

The Uproc vary has lengthy been an integral a part of FLYER’s portfolio. Originally of the yr, the Swiss producer launched the FLYER Uproc X, a full-fat eMTB with a robust Bosch Efficiency Line CX motor, that took half in our large 2024 e-mountainbike comparability check. The Uproc X is now being complemented by the model’s very first gentle eMTB, the Uproc SL:X, which generates 130 mm of journey (f/r) – 20 mm lower than its full-power counterpart. It rolls on 29″ wheels and comes outfitted with a Bosch Efficiency Line SX motor, which delivers as much as 55 Nm of torque and attracts its energy from a 400 Wh battery. All of that is constructed round a carbon body. The 8.70 variant we examined suggestions the scales at XX kg and is predicted to retail for € 7,499. The Uproc SL:X was designed to ship a pure journey feeling and ship tons of enjoyable with its agile dealing with.

The FLYER Uproc SL:X intimately

The FLYER Uproc SL:X depends on a rectilinear, sharp-edged body silhouette, with the shock transitioning seamlessly into the versatile seat stays. These are designed to supply extra compliance and primarily substitute a pivot level within the chainstays, saving weight and minimising the bike’s general complexity. FLYER swim in opposition to the present, routing the cables by means of standard cable ports within the body fairly than by means of the headset, which makes it far simpler to service your bike.

The flex stays are designed to supply extra compliance, which is achieved by means of the form and carbon layup. These substitute a further pivot level between the seat and chainstays.
The cables are routed internally and disappear into the body by means of standard cable ports on the body, making it simpler to service the bike.

The total carbon body is available in a trendy silver paint end, and the extra susceptible areas are lined with protecting movie. A generously sized seat and chainstay protector prevents chain slap and paint chips, whereas a rubber flap between the principle body and swingarm prevents small rocks from getting caught within the hole. Different intelligent particulars embody an built-in multi-tool within the headset (included on the 8.70 and 9.50 variants) and a stem-mounted MonkeyLink interface, which lets you clip on a light-weight that attracts its energy straight from the bike’s most important battery.

The bolted rubber cowl on the transition from the principle body to the swingarm prevents rocks and grime from getting caught within the hole.
A multitool is hidden within the head tube of the 8.70 and 9.50 fashions.
The FLYER Uproc SL:X comes commonplace with a MonkeyLink interface underneath the stem, which lets you merely clip on a headlight that attracts its energy straight from the bike’s most important battery – sensible!

The Bosch Efficiency Line SX motor is neatly built-in into the carbon body and absolutely enclosed in a plastic cowl. It delivers 55 Nm of torque with 600 W of peak energy, and attracts its energy from a 400 Wh battery, which is completely built-in into the down tube.

The Bosch Efficiency Line SX motor is absolutely enclosed in a black plastic cowl. It’s barely seen from the surface.

Nonetheless, which means you’ll need to schlepp the bike into your flat or home should you don’t have a plug socket in your storage – or a storage in any respect. That stated, the charging port simply above the motor is well accessible and feels good to make use of. For extra vary, you may increase the battery with Bosch’s 250 W PowerMore Vary Extender, which comes commonplace with the dearer 8.70 and 9.50 spec variants. Whether or not you pay for it or not, the vary extender may be secured to the bottle cage mounts, which signifies that you’ll have to hold your water bottle in a hip pack or backpack should you want the additional energy.

The charging port on the seat tube is well accessible and makes it simple to plug within the vary extender, with out the cable getting in your method whereas driving.

The wi-fi Bosch Mini Distant and minimalist Bosch System Controller are a well-liked alternative for sporty eMTBs. They solely present fundamental driving information, however that is completely fantastic and matches the sporty orientation and clear look of the FLYER Uproc SL:X. In case you want extra info whereas driving, you may join your bike with the Bosch eBike Circulate app by way of a smartphone.

The wi-fi Bosch Mini Distant impresses with good haptic suggestions and rounds off the bike’s clear look.
The Bosch System Controller doesn’t overwhelm you with a ton of pointless info, and matches in nicely with the sporty idea of FLYER’s Mild eMTB.

The spec of our FLYER Uproc SL:X check bike

For this evaluation, we examined the FLYER Uproc SL:X 8.70 variant, which comes outfitted with a 34 mm FOX Efficiency fork and matching FOX FLOAT Efficiency air shock. Nonetheless, neither of the suspension elements can sustain with their top-tier Manufacturing facility counterparts.

In comparison with the top-tier Manufacturing facility fashions, the FOX Efficiency suspension elements provide fewer adjustment choices and an general weaker path efficiency.

Shifting is taken care of by a cable operated Shimano XT drivetrain, which has lengthy been a well-liked alternative because of its easy, exact shifting. Shimano additionally provide the four-piston Shimano XT brakes and 200 mm rotors, which offer highly effective and dependable deceleration, even on lengthy descents.

Outdated-school however confirmed! The cable-operated 12-speed Shimano XT drivetrain endures easy and exact gear shifts. .
Highly effective Shimano XT four-piston brakes are paired with large 200 mm rotors.

A brand-new OneUp V3 dropper submit affords 180 mm journey in dimension L, making certain adequate freedom of motion on the path. The cockpit consists of a Satori Ursa stem and Hayes ProTaper carbon handlebars in a whopping 810 mm width. For the wheels, FLYER mix a DT Swiss HX 1700 LS alloy wheelset with shallow-profiled Schwalbe Depraved Will tires, each within the onerous Speedgrip rubber compound and puncture-prone Tremendous Floor casing. We positively advocate upgrading the tires to a extra aggressive mannequin just like the Schwalbe Nobby Nic – and whilst you’re at it, go for the extra strong Path casing and grippier Delicate rubber compound.

The OneUp V3 dropper submit affords 180 mm stroke in body dimension L, making certain adequate freedom of motion on the bike.
The Schwalbe Depraved Will tires each come within the puncture-prone Tremendous Floor casing and the onerous Speedgrip compound.

FLYER Uproc SL:X 8.70

€ 7,499


Motor Bosch Efficiency Line SX 55 Nm
Battery Bosch PowerTube 400 Wh
Show Bosch System Controller
Fork FOX 34 Efficiency 130 mm
Rear Shock FOX Float Efficiency 130 mm
Seatpost One Up V3 180 mm
Brakes Shimano XT 203/203 mm
Drivetrain Shimano XT 1×12
Stem Satori Ursa 35 mm
Handlebar Hayes ProTaper Carbon 810 mm
Wheelset DTSwiss HX1700 LS 29″
Tires Schwalbe Depraved Will, Tremendous Floor, Speedgrip 2.4″

Technical Information

Measurement S M L XL
Weight 18.9 kg
Perm. whole weight 130 kg
Max. payload (rider/tools) 111 kg

Particular Options

vary extender

Tuning tip: tire with a extra strong casing and aggressive profile

All spec variants of the FLYER Uproc SL:X

The FLYER Uproc SL:X is out there in 4 completely different spec variants, 4.10, 6.50, 8.70 and 9.50, all of which come commonplace with 29″ wheels and a Bosch Efficiency Line SX motor with a 400 Wh battery. The FLYER Uproc SL:X 4.10 entry-level mannequin retails at € 5,799, for which you’ll get X-Fusion suspension and TRP Slate Evo brakes. Shifting is taken care of by a 12-speed Shimano DEORE drivetrain. Retailing at € 6,999, the Uproc SL:X 6.50 comes outfitted with a FOX 34 Rhythm fork, FOX FLOAT Efficiency air shock and a sturdy, digital SRAM GX Eagle Transmission groupset, which delivers the identical excellent efficiency on the path as its top-tier XX Eagle Transmission counterpart. The FLYER Uproc SL:X 9.50 flagship mannequin units you again € 9,999 and incorporates a prestigious, high-quality spec, together with a bling SRAM XX Eagle Transmission drivetrain and fancy FOX Manufacturing facility suspension. The Uproc SL:X 9.50 flagship mannequin can be the one one to come back commonplace with a DT Swiss HXC 1501 carbon wheelset.

The geometry of the FLYER Uproc SL:X

The FLYER Uproc SL:X is out there in 4 sizes, S to XL, providing an acceptable alternative for riders between 155 and 195 cm tall. Total, FLYER’s very first gentle eMTB depends on a average geometry. Our check bike in dimension L combines 485 mm attain and a 65° head angle, which is neither notably slack, nor notably steep. At 440 mm, the seat tube is on the quick facet and, along with the 180 mm dropper submit, ensures adequate freedom of motion. Chainstay size is 453 mm throughout all body sizes. A flip-chip on the shock mount means that you can swap between a high and low setting. When set to low, the pinnacle angle is barely slacker and the underside bracket decrease.

Measurement S M L XL
High tube 571 mm 605 mm 629 mm 664 mm
Seat tube 380 mm 400 mm 440 mm 480 mm
Head tube 100 mm 110 mm 125 mm 135 mm
Head angle 65° 65° 65° 65°
Seat angle 77.3° 77.1° 77° 76.8°
Chainstay 453 mm 453 mm 453 mm 453 mm
BB Drop 38 mm 38 mm 38 mm 38 mm
Wheelbase 1,199 mm 1,234 mm 1,258 mm 1,294 mm
Attain 435 mm 465 mm 485 mm 515 mm
Stack 605 mm 614 mm 623 mm 637 mm

What’s the FLYERFlyer Uproc SL:X able to on the path?

As quickly as you swing your leg over the saddle, the FLYER Uproc SL:X locations you in a compact but snug pedalling place, which is mild in your again even after an extended day within the saddle. When cruising on degree floor, there’s a slight strain in your fingers, however this turns out to be useful as quickly because the gradient steepens, because it helps to maintain the entrance wheel planted. The Bosch Efficiency Line SX motor packs a punch, pushing considerably more durable than different gentle motors within the strongest help degree, making it simple to barter even steep climbs – supplied the terrain is dry and grippy. In moist circumstances, the agency rear suspension and shallow profiled tires generate poor traction and battle to switch the motor energy to the bottom.

Once you drop right into a path to shred your method again down into the valley, you’re properly built-in with the bike. The load is evenly distributed between the entrance and rear wheel, which means that you just don’t need to actively weight the handlebars to maintain the entrance wheel monitoring, even in quick, open corners. The Flyer Uproc SL:X is especially enjoyable to journey on flowing trails, the place the agency suspension means that you can generate velocity by pumping by means of rollers and berms. Nonetheless, the rougher the path will get, the extra demanding the FLYER turns into, requiring good driving abilities and a cautious, proactive driving fashion. The agency suspension passes on suggestions to the rider virtually unfiltered, requiring a excessive degree of focus from inexperienced riders. The nimble, agile dealing with, alternatively, encourages skilled riders to play with the terrain and makes it simple for them to spontaneously change their line. This all goes out of the window in moist circumstances, nevertheless – the shallow profiled tires shortly attain their limits, at which level you change into extra of a passenger than a pilot. In case you spend most of your time on technical trails, it’s best to improve to extra aggressive tires with a extra strong casing and softer rubber compound.

Who ought to take a better have a look at the FLYER Uproc SL:X?

The FLYER Uproc SL:X is an effective match above all for sporty riders who need an agile path bike with motor help. On dry, flowing trails, it slaps a large grin in your face, no matter whether or not you’re a beginner or a seasoned path warrior. In case you spend most of your time on technical trails, it’s best to have degree of driving abilities to journey the FLYER Uproc SL:X!

Our conclusions in regards to the FLYER Uproc SL:X

The brand new FLYER Uproc SL:X Mild-E-MTB appears to be like trendy and options some very intelligent particulars, just like the built-in multitool within the head tube and commonplace protecting movie. It reveals its strengths on the ascents, particularly on steep climbs that aren’t too technical. Downhill, it’s notably spectacular on flowing trails, the place it slaps a large grin in your face. When the going will get rougher, nevertheless, it requires an skilled rider to maintain it in test.


  • Built-in mini-tool within the headset
  • Clear look
  • Agile dealing with


  • Tires do not do justice to the bike’s supposed use
  • Skilled rider required for technical terrain

For extra info, go to

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Phrases: Mike Starvation Pictures: Mike Starvation, Hersteller

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