Trek

Powerfly FS 2023

Discontinued✎Full Power · Cross-CountryLegacy · 1/10iFreshness 1/10
How current the bike is — newer chassis, motor and battery score higher. 10 = brand-new, 0 = legacy.

Comfort-oriented short-travel full-suspension trail bike for easy singletrack

Motor

Bosch Performance Line CX Gen 4 · 85Nm · 600W↗

Battery

Bosch PowerTube 625 · 625Wh

Travel F/R

120/100mm

Wheels

29F / 29R✎

Frame

Aluminium✎

Weight

24.37 kg

Price

From £4,250

View the Trek Powerfly FS on Trek’s site

Trek Powerfly FS 2023

From £4,250

<p>The 2023 Trek Powerfly FS is the do-everything aluminium full-susser of the range: 120mm up front, 100mm out back on Trek's ABP linkage, Bosch Performance Line CX (85 Nm) and a removable 625Wh PowerTube on all but the entry FS 4 500 (500Wh). It is a trail/trekking bike rather than an enduro weapon, with a sensible 66.5deg head angle, 76deg effective seat angle and a tidy 470mm chainstay. Note the mullet-by-size approach: XS and S roll on 27.5in wheels with a 100mm fork, while M, L and XL get 29in wheels and the full 120mm.</p><p>Trims run from the workmanlike FS 4 500/625 (Suntour XCR 34 fork, Tektro brakes, 10-speed Deore) up through the FS 4 Equipped commuter build (mudguards, rack, lights, LT4 tyres) to the FS 7 (RockShox 35 Gold RL, SIDLuxe shock, 12-speed SLX/XT) and the range-topping FS 9 Equipped with full XT. Weights are honest at roughly 24-25kg for the trail builds and 27kg for the Equipped models. Geometry is consistent and well-mannered across all five sizes. Discontinued and superseded by the Gen 3/Gen 4 Powerfly FS+, but a solid, reliable used buy if you want Bosch full-power assistance without enduro pretensions.</p>

EMTB Forums verdict

The 2023 Trek Powerfly FS is the do-everything aluminium full-susser of the range: 120mm up front, 100mm out back on Trek's ABP linkage, Bosch Performance Line CX (85 Nm) and a removable 625Wh PowerTube on all but the entry FS 4 500 (500Wh). It is a trail/trekking bike rather than an enduro weapon, with a sensible 66.5deg head angle, 76deg effective seat angle and a tidy 470mm chainstay. Note the mullet-by-size approach: XS and S roll on 27.5in wheels with a 100mm fork, while M, L and XL get 29in wheels and the full 120mm.

Trims run from the workmanlike FS 4 500/625 (Suntour XCR 34 fork, Tektro brakes, 10-speed Deore) up through the FS 4 Equipped commuter build (mudguards, rack, lights, LT4 tyres) to the FS 7 (RockShox 35 Gold RL, SIDLuxe shock, 12-speed SLX/XT) and the range-topping FS 9 Equipped with full XT. Weights are honest at roughly 24-25kg for the trail builds and 27kg for the Equipped models. Geometry is consistent and well-mannered across all five sizes. Discontinued and superseded by the Gen 3/Gen 4 Powerfly FS+, but a solid, reliable used buy if you want Bosch full-power assistance without enduro pretensions.

Geometry read

What the numbers mean on the trail

Computed from this bike's geometry, spec and build kit — reach, wheelbase, chainstay, head and seat angles, travel, motor, weight and the fork/tyre/brake spec — and worked out per size, because a fixed chainstay can make an S and an XL feel very different.

Size

Wheels

Descending

A solid all-round descender (66.5° head angle, 100mm) — capable in the rough and steep without being an all-out bruiser.

Playfulness

A fair bit of pop, but happiest on flowing trail rather than trials moves.

Size balance

Rear-long with a planted front in L (FC:RC 1.64) — easy to weight the front and quick to turn, though it can feel light at the back at real speed.

Technical climbing

Bosch Performance Line CX Gen 4 and a steep 76° seat angle keep the weight planted over the front — a proper winch. 600W of peak power and 85Nm of torque — a strong full-power motor.

Best suited toAll-round trail riding across mixed terrain.

No single standout trait — a balanced, versatile bike.

Watch out forNo major red flags in the L geometry.

The numbers are well balanced for its category.

How it stacks up vs other Full Power · Cross-Country bikes (from 130 bikes in the database)

Weight24.37 kg0.7 kg heavier than average

Battery625 Wh61 Wh below average

Motor torque85 Nmabout average torque

Value for money18/100from £4,250 · most Bosch Performance Line CX Gen 4 bikes ~£3,499

Computed from geometry + spec, not a paid review. Scores are guidance, not gospel.

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💬 Forum discussion

Trek Powerfly FS 2019 - scrapping/tinny noise

8 replies · 5.5k views · last reply 86 months ago

Join the discussion →

“I used to get a tinny rattle from my rear disc @ ~15mph on my LT7. Changed to some different discs and the noise has gone.”

— thewildblue · ♥ 3 · most-liked post

Geometry · hover a row to highlight the measurement on the bike

	XS	S	M	L	XL
Reach	405 mm	415 mm	430 mm	460 mm	485 mm
Stack	599 mm	599 mm	637 mm	646 mm	646 mm
Seattube	368 mm	395 mm	420 mm	450 mm	500 mm
Chainstay	468 mm	468 mm	470 mm	470 mm	470 mm
Headtube Angle	66.5°	66.5°	66.5°	66.5°	66.5°
Seattube Angle (eff)	76°	76°	76°	76°	76°
Wheelbase	1170 mm	1180 mm	1206 mm	1240 mm	1265 mm
Headtube	140 mm	140 mm	130 mm	140 mm	140 mm
BB Height	332 mm	332 mm	335 mm	335 mm	335 mm
Standover	691 mm	691 mm	712 mm	716 mm	713 mm
Front Centre	702 mm*	712 mm*	736 mm*	770 mm*	795 mm*
FC:RC	1.50	1.52	1.57	1.64	1.69

Trims · 5

	4 500 £4,250	4 625 £4,550	4 Equipped £4,700	7 £5,700	9 Equipped £6,700
Motor	Bosch Performance Line CX Gen 4 · 85 Nm · all trims
Battery	Bosch PowerTube 625 · 625 Wh · all trims
Travel F/R	120/100 mm · all trims
Frame	Alpha Platinum Aluminium · all trims
Fork	SR Suntour XCR 34, air, LO R, 100mm (XS/S) / 120mm (M/L/XL)	SR Suntour XCR 34, air, LO R, 100mm (XS/S) / 120mm (M/L/XL)	SR Suntour XCR 34, air, LO R, 100mm (XS/S) / 120mm (M/L/XL)	RockShox 35 Gold RL, air, 100mm (XS/S) / 120mm (M/L/XL)	SR Suntour Zeron 35, air, 120mm
Shock	SR Suntour Edge R, 190x45mm	SR Suntour Edge R, 190x45mm	SR Suntour Edge R, 190x45mm	RockShox SIDLuxe Select+, 190x45mm	RockShox SIDLuxe Select+, 190x45mm
Headset	FSA IS-2 · all trims
Handlebar	Bontrager alloy, 15mm rise, 720mm	Bontrager alloy, 15mm rise, 720mm	Bontrager alloy, 15mm rise, 720mm	Bontrager alloy, 15mm rise, 750mm	Bontrager alloy, 15mm rise, 750mm
Grips	Bontrager XR Trail Comp	Bontrager XR Trail Comp	Bontrager XR Endurance Comp	Bontrager XR Trail Comp	Bontrager XR Endurance Comp
Saddle	Bontrager Arvada, steel rails, 138mm	Bontrager Arvada, steel rails, 138mm	Bontrager Commuter Comp	Bontrager Arvada, steel rails, 138mm	Bontrager Commuter Comp
Seatpost	TranzX JD-YSP18 dropper 100mm (XS/S/M) / 130mm (L/XL)	TranzX JD-YSP18 dropper 100mm (XS/S/M) / 130mm (L/XL)	TranzX JD-YSP18 dropper 100mm (XS/S/M) / 130mm (L/XL)	TranzX JD-YSP18 dropper 100mm (XS/S/M) / 130mm (L/XL)	Bontrager Line Dropper, 100mm (XS/S/M) / 150mm (L/XL)
Brakes	Tektro HD-M275 hydraulic disc, 203mm rotors	Tektro HD-M275 hydraulic disc, 203mm rotors	Tektro HD-M275 hydraulic disc, 203mm rotors	Shimano M6100/M6120 4-piston hydraulic disc (alt SRAM DB8); Shimano RT66 203mm or SRAM CentreLine 200mm rotors	Shimano XT M8120 4-piston hydraulic disc, 203mm rotors
Rear derailleur	Shimano Deore M5120, long cage	Shimano Deore M5120, long cage	Shimano Deore M5120, long cage	Shimano XT M8100, long cage	Shimano XT M8100, long cage
Crank	FSA Bosch CK-220, 36T, 165mm	FSA Bosch CK-220, 36T, 165mm	FSA Bosch CK-220, 36T, 165mm	Ethirteen Espec Plus, 36T, 165mm	Ethirteen Espec Plus, 34T, 165mm
Shifters	Shimano Deore M4100, 10 speed	Shimano Deore M4100, 10 speed	Shimano Deore M4100, 10 speed	Shimano SLX M7100, 12-speed	Shimano XT M8100, 12-speed
Cassette	Shimano Deore M4100, 11-46, 10-speed	Shimano Deore M4100, 11-46, 10-speed	Shimano Deore M4100, 11-46, 10-speed	Shimano SLX M7100, 10-51T (alt Deore M6100)	Shimano XT M8100, 10-51T
Chain	KMC X10	KMC X10	KMC X10	Shimano SLX M7100	Shimano XT M8100
Drivetrain	Shimano Deore M5120, long cage; FSA Bosch CK-220, 36T, 165mm; Shimano Deore M4100, 10 speed; Shimano Deore M4100, 11-46, 10-speed; KMC X10	Shimano Deore M5120, long cage; FSA Bosch CK-220, 36T, 165mm; Shimano Deore M4100, 10 speed; Shimano Deore M4100, 11-46, 10-speed; KMC X10	Shimano Deore M5120, long cage; FSA Bosch CK-220, 36T, 165mm; Shimano Deore M4100, 10 speed; Shimano Deore M4100, 11-46, 10-speed; KMC X10	Shimano XT M8100, long cage; Ethirteen Espec Plus, 36T, 165mm; Shimano SLX M7100, 12-speed; Shimano SLX M7100, 10-51T (alt Deore M6100); Shimano SLX M7100	Shimano XT M8100, long cage; Ethirteen Espec Plus, 34T, 165mm; Shimano XT M8100, 12-speed; Shimano XT M8100, 10-51T; Shimano XT M8100
Wheels	Alex MD35, TR, 32-hole, 35mm	Alex MD35, TR, 32-hole, 35mm	Bontrager Kovee, TR, 28-hole, 23mm	Bontrager Line Comp 30, TR	Bontrager Line Comp 30, TR
Tyres	Bontrager XR3 Comp 27.5x2.35 (XS/S) / 29x2.30 (M/L/XL)	Bontrager XR3 Comp 27.5x2.35 (XS/S) / 29x2.30 (M/L/XL)	Bontrager LT4 Expert 27.5x2.40 (XS/S) / 29x2.40 (M/L/XL)	Bontrager XR4 Team Issue 27.5x2.40 (XS/S) / 29x2.40 (M/L/XL)	Bontrager LT4 Expert 27.5x2.40 (XS/S) / 29x2.40 (M/L/XL)
Weight	24.83 kg	24.83 kg	27.38 kg	24.37 kg	27.05 kg
Price	£4,250	£4,550	£4,700	£5,700	£6,700

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