Trek FX+ 7, 7S and 9: parts and specs
Replacement parts and specs for the Trek FX+ 7 family: TQ HPR50 mid-drive, 360 Wh battery, TQ charger, HPR range extender, 180 and 160 mm rotor limits and 12 mm rear thru axle.
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Specs are for the stock bike as sold; check your own bike before you buy. This page covers the FX+ 7 frame, Trek's TQ powered city bike, which weighs about 18 kg in size medium. It uses the TQ HPR50 mid-drive (50 Nm); see Fazua and TQ motors explained. The handlebar is one piece with the stem and headlight, so don't swap it. Ride modes, range and battery health are set in the Trek Central app.
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 range extender. Battery and motor service on the TQ system is dealer work: a Trek or TQ dealer reads faults with the TQ dealer service tool.
Parts list
- Brake rotor: the frame and fork take rotors up to 180 mm front and 160 mm rear. The rear wheel uses a 12 mm thru axle with 142 mm spacing.
- E-bike charger: the TQ charger that comes with the bike charges the battery in about 2 hours. Use only that charger.
- E-bike battery: 360 Wh TQ battery; the system works only with this battery, and an authorised Trek dealer removes it. TQ's battery and range extender page covers the 360 Wh pack. Trek sells the TQ HPR Range Extender Battery (price not shown, read Nov 9, 2026); TQ makes it in 160 Wh, so check the label on any extender you buy.
- E-bike lights: headlight built into the bar and stem; rear light housed in the integrated rear rack, which is not designed to be swapped.
- Saddle: the frame is routed inside for a dropper seatpost.
Tools for common jobs
- Hex keys: stem cap, rack and fender bolts.
- Torx keys: rotor bolts on six-bolt rotors.
- Tire levers: fitting a new tube.
- Floor pump with gauge: keeping pressure within the sidewall range.
- Torque wrench: thru axle and rack bolts, to the values on the part.
- Chain checker: catching chain wear early.
- Chain lube: after cleaning and wet rides.
Where to buy
- Trek's TQ HPR Range Extender Battery page and TQ's battery and range extender page.
- Independent sellers: parts suppliers.
- A Trek retailer orders and fits parts for this bike: find a shop.
Common repairs
- Trek e-bike troubleshooting and TQ troubleshooting
- 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, and check bolts and torque and update e-bike firmware
Sources
- trekbikes.com
- battery and range extender page, tq-ebike.com
- TQ HPR Range Extender Battery, trekbikes.com
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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