Trek Powerfly hardtail and Powerfly FS: parts and specs
Replacement parts and specs for the Bosch smart system Trek Powerfly hardtail (Gen 4) and Powerfly FS (Gen 3): tire sizes by frame size, tubeless by trim, 180 mm rear rotor, CX motor and 4A charger.
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Specs are for the stock bike as sold; check your own bike before you buy. This page covers the 2023 Powerfly hardtail and Powerfly FS on the Bosch smart system with a Performance Line CX motor (85 Nm); see Bosch motors explained. Earlier Powerfly FS models used the older Bosch system with up to a 625 Wh battery in Trek's RIB mount, and the Powerfly+ FS Gen 4 uses RIB 2.0 with up to 800 Wh, so check your model year first. The FS runs 100 mm rear and 120 mm front travel.
Electrical parts on this list must match this exact model and are fitted at the external plugs or by a pro. Never open the battery, motor, display or remote. Battery and motor service on the Bosch system is dealer work: a Bosch dealer reads faults with its diagnostic tool.
Parts list
- Tire: Powerfly FS: 27.5 x 2.60 inch on XS and S; 29 x 2.40 inch with the mudguard on M and up. Hardtail: 27.5 x 2.6 inch on XS and S; 29 x 2.6 or 27.5 x 2.8 inch on M and up. The FS takes no other sizes.
- Inner tube: the Powerfly 4 ships with tubes on tubeless compatible rims, and the Powerfly FS 9 has wire bead tires that need tubes.
- Tubeless sealant: the Powerfly 7 has tubeless rims and tires; add sealant to run it tubeless. The Powerfly 4 needs tubeless tires, valves and sealant bought separately.
- Brake rotor: 180 mm direct mount rear brake, rotors up to 203 mm. Front rotor size follows the fork.
- E-bike charger: a 4A charger takes just over two hours to 50% and about five hours to full. Bosch's smart system charger page covers the 4A unit.
- E-bike battery: smart system battery; the 750 Wh smart system pack doesn't fit these frames, and Range Boost doesn't either. Match the Wh on your battery label.
- E-bike display: Bosch smart system display and remote, with a wired speed sensor.
- E-bike lights: a headlight wire comes pre-installed.
Tools for common jobs
- Hex keys: stem, pivot and brake bolts.
- Torx keys: rotor bolts on six-bolt rotors.
- Tire levers: fitting tubes on the Powerfly 4 and FS 9.
- Floor pump with gauge: seating tubeless tires and setting pressure.
- Torque wrench: pivot, axle and brake bolts, to the values on the frame.
- Chain checker: catching chain wear early.
- Chain lube: after cleaning and wet rides.
Where to buy
- Bosch's smart system charger page.
- Independent sellers: parts suppliers.
- A Trek retailer orders and fits parts for this bike: find a shop.
Common repairs
- Trek e-bike troubleshooting, Bosch troubleshooting and Bosch error codes
- Tubeless tires and sealant, set tire pressure and e-bike flat tire
- Replace disc brake pads, bed in disc brakes and clean and true brake rotors
- Clean and lube the chain and check and replace the chain
- Battery won't charge, e-bike battery care and store your battery for winter
Sources
Stuck after these checks? Find a shop near you.
If these steps didn't fix it, find a shop near you in our partner network. For battery or wiring trouble, look for shops marked Battery and electrical.
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