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The Trek Powerfly+ FS 5 is an aluminium full-suspension electric mountain bike that bridges the gap between the FS 4 and FS 6: Bosch CX motor, 800 Wh battery, 12-speed Shimano drivetrain with XT 10-51 cassette and four-piston Shimano MT620 brakes. It runs 120 mm at the rear and a RockShox Psylo Silver RC fork, for 24.58 kg in size M according to Trek. The Blue Sage/Catalina Fog colourway pairs a sage blue-green with a deeper teal.
| Frame | Alpha Platinum aluminium, removable integrated RIB 2.0 battery, Motor Armor protection, Mino Link adjustable geometry, adjustable suspension leverage, ABP, UDH hanger, Boost148, rack and mudguard mounts |
| Motor | Bosch Performance Line CX, 250 W rated, assist up to 25 km/h (European version) |
| Battery | Bosch PowerTube 800 Wh, smart system |
| Controls / display | Bosch Purion 200 |
| Suspension | RockShox Psylo Silver RC Solo Air, 130 mm in S, 160 mm from M to XL / RockShox Deluxe Select 210x50 mm, 120 mm |
| Drivetrain | Shimano 1x12: Deore M8200 long-cage derailleur, XT M8100 10-51 cassette, FSA 160 mm cranks |
| Brakes | Shimano MT620 4-piston hydraulic, RT64 203 mm rotors |
| Wheels / tyres | Shimano TC500 hubs, Bontrager Kovee 23 mm rims / Gunnison Pro XR 2.40 (29 in, 27.5 in in size S) |
| Cockpit | Bontrager Comp 780 mm handlebar, 40 mm rise, Bontrager Comp 50 mm stem |
| Saddle / seatpost | Bontrager Verse P3 / TranzX JD-YSI34, 100 to 170 mm depending on size |
| Weight | 24.58 kg in size M (Trek figure, with tubeless sealant, no inner tubes) |
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At a glance
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For the mountain biker who wants an e-MTB that can progress with them, with a 12-speed drivetrain and quality Shimano brakes, without going top of the range. It is aimed at riders who head out once or twice a week on varied trails.
Adjustable suspension ratio, the frame's trump card. This frame offers an adjustment that is rare at this price point: an adjustable suspension ratio, which changes the way the shock firms up at the end of its stroke. More progressive, it resists landings better; more linear, it makes fuller use of its 120 mm over loose rocks. On the FS 5, which gets a long-travel fork from size M, this setting helps balance the front and rear.
| Alpha Platinum (Powerfly+ FS) | Alpha NEXT Platinum (Fuel+ EX 8) | OCLV Mountain (Rail+ 9.7 / 9.8) | |
| Level | Adjustable e-MTB aluminium | High-end mountain bike aluminium | OCLV Mountain carbon |
| Construction | Adjustable suspension ratio and geometry | Thinner tubes | Impact-oriented carbon moulding |
| Reference bike | Powerfly+ FS 5, 24.58 kg (M) | Fuel+ EX 8 | Rail+ 9.7, 23.73 kg (M) |
| What it means | A frame you adapt to your terrain | Weight saving, more discreet motor | 850 g lighter than this FS 5 |
Put simply: the FS 5 is the missing middle step between the 10-speed FS 4 and the FS 6. It moves up to 12 speeds and 4-piston Shimano brakes, and comes down to 24.58 kg in M, 920 g less than the FS 4 800 Wh.
The 12-speed XT 10-51 cassette offers closer gaps than the 10 speeds of the FS 4: you find the right cadence more easily, which makes the assist more efficient. The shorter 160 mm FSA cranks reduce pedal strikes on rocks in technical sections.
The four-piston Shimano MT620 brakes on 203 mm rotors offer welcome power and consistency on long descents. The Bosch assist, as European regulations require, cuts out at 25 km/h with 250 W nominal, and can be updated with the Bosch eBike Flow app.
| Model | Motor / battery | Rear / front travel | Drivetrain | Weight (M) |
| Powerfly+ FS 4 800 Wh | Bosch CX / 800 Wh | 120 / 130 mm | Shimano CUES 10-speed | 25.50 kg |
| Powerfly+ FS 5 | Bosch CX / 800 Wh | 120 / 160 mm | Shimano Deore/XT 12-speed | 24.58 kg |
| Powerfly+ FS 6 (Fox 36) | Bosch CX / 800 Wh | 120 / 140 mm | SRAM Eagle 70 12-speed | 25.08 kg |
| Rail+ 5 | Bosch CX / 800 Wh | 160 / 160 mm | Shimano Deore 12-speed | 24.78 kg |
Our take: at 24.58 kg in M, the FS 5 weighs 920 g less than the FS 4 800 Wh, with 12 speeds and 4-piston Shimano brakes. The FS 6 with Fox 36 weighs 500 g more (25.08 kg) with Fox suspension.
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LVR sizing advice A quirk of the FS 5: size S gets a 130 mm Psylo and 27.5-inch wheels, sizes M to XL a 160 mm Psylo with 29-inch wheels. If you are between two sizes, bear this change of fork in mind; we explain it in store.
Source: Trek size guide. Bike fitting available in our Béziers shop. |
| Why the FS 5 rather than an FS 4? | For the 12 speeds, the 4-piston Shimano brakes and a lower weight. |
| Which fork for which size? | A 130 mm Psylo in S, 160 mm from M to XL. |
| Is the sage blue understated? | Yes, it is a soft blue-green with teal, elegant and original. |
| Can the suspension be adjusted? | Yes, the frame's ratio is adjustable; we set it to suit your riding. |
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The LVR Cycles verdict The happy-medium Powerfly+ FS, with 12 speeds, 800 Wh and good brakes for a reasonable weight. The sage blue and teal give it a soft, distinctive look.
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Why buy from LVR Cycles? As a Trek dealer in Béziers, we set up your Powerfly+ FS 5 for your weight, adjust the suspension ratio and look after Shimano servicing and Bosch support.
Please note that the specifications may be changed without prior notice by the manufacturer, based on the availability of components and other factors.
Data sheet
Specific References