Trek Domane+ SLR: parts and specs
Replacement parts and specs for the Trek Domane+ SLR 6, 7 and 9 e-road bikes: tubeless wheels, 160 to 180 mm front and 140 to 160 mm rear rotors, TQ HPR50 or HPR60, 360 Wh battery and 160 Wh range extender.
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Specs are for the stock bike as sold; check your own bike before you buy. This page covers the MY23 Domane+ SLR 6, 7 and 9 on endurance geometry. The SLR 6 uses the TQ HPR50 and the SLR 7 and 9 the TQ HPR60, with up to 300 watts of assist and three assist modes; see Fazua and TQ motors explained. The frame runs electronic drivetrains only. Hubs are 100 x 12 mm front and 142 x 12 mm rear.
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
- Tire: tubeless ready wheels and tires; the maximum size varies by build, so read it off the tire on your bike.
- Tubeless sealant: the bike ships set up with tubeless valves and Trek TLR sealant.
- Brake rotor: front 160 to 180 mm, rear 140 to 160 mm.
- Chainring: SRAM X-SYNC 1x rings from 36T to 46T on a 107 BCD Praxis spider, or Shimano Praxis 48/36, 50/34 or 52/36 doubles.
- E-bike charger: TQ charger; the battery charges in about two hours and the range extender in about one.
- E-bike battery: 360 Wh, 1,835 g; keep it above 30% if the bike sits for three months or more. TQ's battery and range extender page covers it. Trek sells the TQ HPR Range Extender Battery (price not shown, read Nov 9, 2026); the 160 Wh pack (Trek part 5289555) adds about 40% range and fits with power cable 5289576, retention strap 5299107 and four W575056 bolts.
- E-bike display: TQ display with the TQ Smart Box; Bluetooth or ANT+ computers pair with it, and settings live in the Trek Central and TQ apps.
- E-bike lights: the Smart Box has front, rear and 12 V aux outputs.
- Saddle: set the seatpost by loosening the M6 bolt, then torque it to 5.2 Nm.
Tools for common jobs
- Hex keys: the M6 seatpost bolt and stem bolts.
- Torx keys: rotor bolts on six-bolt rotors.
- Floor pump with gauge: seating tubeless tires and setting pressure.
- Torque wrench: the seatpost bolt at 5.2 Nm, and thru axles to the values on the part.
- Chain checker: catching chain wear early.
- Chain lube: after cleaning and wet rides.
- Chain tool: fitting a new chain.
Where to buy
- Trek's TQ HPR Range Extender Battery page and TQ's battery and range extender page. Fender mounts take Trek kit W331954.
- 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
- 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
- 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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