Skip to content

Where can I find the service manual?

Detailed setup and service information (including routing instructions, light mounting, cockpit swaps, torque specs, and part numbers) is available in the Domane+ SL Service Manual

Service Manuals

What is Domane+ SL?

Domane+ SL is a carbon performance road bike with a discreet, seamlessly integrated TQ HPR40 electric motor that provides up to 28mph (US) of smooth, natural-feeling assist. It’s built with 500 Series OCLV Carbon and features Road Endurance Geometry for all-day comfort. Available in three models: Domane+ SL 6 AXS (360Wh battery), Domane+ SL 7 AXS, and Domane+ SL 9 AXS — with the SL 7 and SL 9 models offering a choice of 360Wh or 580Wh battery in Project One. It's Trek's lightest and longest-range Domane+ ever.

How does the new Domane+ SL compare to the previous Domane+ SLR?

Key updates include:

  • New TQ HPR40 motor – lighter and more compact than the HPR50/HPR60 motors on the previous generation, while still delivering powerful, quiet assist
  • Two battery options in Project One – choose 360Wh (~70-mile range) or 580Wh (~115-mile range), versus the fixed 360Wh on the SLR
  • Much longer potential range – up to ~115 miles with the 580Wh battery or up to 70 miles with the 360Wh battery, vs. ~60 miles on the previous Domane+ SLR
  • Gen 5 OCLV 500 carbon frame – no IsoSpeed (lighter and simpler) while maintaining Domane comfort
  • New 27.2mm round carbon seatpost – adds road compliance
  • New Domane Riser road handlebar – provides 20mm of rise for a more upright position without a positive stem angle
  • 40mm tire clearance (35mm with fenders)
  • Integrated front and rear lights wired to the TQ battery
  • More frame bag, triangle bag, and fender mounts
  • Available to fully customize in Project One: battery size, component sizing, paint, and build

What is the geometry?

Domane+ SL uses Road Endurance Geometry, which features a taller head tube and longer wheelbase compared to race-oriented bikes like Madone. This maximizes comfort and stability on long rides while keeping the bike fast and confident.

What frame sizes are available?

Domane+ SL is available in six frame sizes: XS, S, M, ML, L, and XL.

What is the frame material?

500 Series OCLV Carbon frame and fork. This makes Domane+ SL Trek's lightest Domane+ to date.

Does Domane+ SL have IsoSpeed?

No. Gen 5 Domane removes IsoSpeed for a lighter, simpler design. The 27.2mm round carbon seatpost, larger tire clearance, and larger tire spec work together to help absorb road chatter.

What is the Bontrager Domane riser road handlebar?

The Domane Riser road handlebar comes on most Domane+ SL models and is designed to put riders in a more upright, comfortable position without requiring a positive stem angle.

Key specs:

  • 20mm of rise
  • 70mm reach (shorter than a traditional road bar)
  • 9 degrees of flare which translates to 4cm wider drops than the controls, width for easier access and more control in the drops
  • Carbon Pro version adds 4 IsoZone vibration-dampening pads (on top of bar, hoods, and drops)

Do I have to use the riser road handlebar?

No. If you prefer a lower or more aggressive riding position, a traditional road handlebar or an aero option is compatible. Talk to your Trek retailer about fit options.

What motor does Domane+ SL use?

Domane+ SL uses the TQ HPR40 mid-drive motor. It's compact, lightweight, and uses a harmonic pin ring (HPR) drive — no gears or belts, which means it's quieter, smaller, and more reliable than conventional e-bike motors.

How does the TQ Harmonic Pin Ring motor work?

Most e-bike motors use gears and belts to transmit power. These take up space and can make noise or break over time. The TQ HPR40 uses a harmonic drive transmission that is small, mechanically simple, and very dependable. The result is a motor that looks and sounds far more like a conventional road bike.

What is the max assist speed?

28mph in the US. 25kph in EU and Australia. 45kph in New Zealand. Other markets are subject to local speed regulations.

Does it have wiring for lights?

Yes. All bikes come with the TQ SmartBox installed. It has output ports for a front light, rear light, auxiliary power, and electronic shifting. Integrated front (daytime running light) and rear lights come standard and are wired to the TQ battery so you charge everything at once.

Is there a walk assist mode?

No. Walk assist is not available on Domane+ SL.

Will the e-system work in extreme temperatures?

Follow the temperature range guidelines in the TQ HPR40 Quick Start Guide, available on the Service Manuals page.

Service Manuals

Does the Domane+ SL have a power meter?

The TQ system includes a power sensor accurate enough to provide smooth, natural assist, but it is not accurate enough for athletic training data. For training purposes, Trek recommends a dedicated pedal-based power meter.

Is there an optimum cadence for the TQ motor?

Yes. The torque vs. cadence curve is flattest between 60–90 RPM, and peak torque begins to fall off around 95 RPM. Riding in that range gives you the most efficient and natural-feeling assist.

Does the motor need regular servicing?

The TQ motor requires firmware updates only, which are performed by a Trek retailer using the TQ service tool. E-system components are intended to be serviced by dealers. Please contact your local Trek retailer for any issues.

Will Trek stock TQ spare parts?

Yes. Trek distribution centers stock TQ components used on Domane+ SL, as well as the optional Range Extender battery, harness, and cable.

For AXS and Di2 bikes that run the rear derailleur off the TQ battery — will the bike still shift after the battery is dead?

Yes. Even with a depleted battery, the system will supply approximately 300 shifts to the rear derailleur after motor assist stops.

Can SRAM AXS shift buttons control TQ assist modes?

Yes. On AXS-equipped bikes, the SRAM bonus buttons can be synced to control TQ support modes. Syncing is done using the TQ Diagnostic Service Tool (DST) or through the Trek Central / TQ app. See your retailer or the Trek Central app for setup instructions.

Learn more about Trek Central

What battery options are available?

Battery options depend on the model:

  • Domane+ SL 6 AXS: 360Wh battery (standard, fixed)
  • Domane+ SL 7 AXS and SL 9 AXS: choose 360Wh or 580Wh in Project One

All batteries are integrated inside the downtube.

What range can I expect?

In Eco Mode: approximately 70 miles with the 360Wh battery, or approximately 115 miles with the 580Wh battery (available on SL 7 AXS and SL 9 AXS in Project One). Range varies significantly based on rider weight, assist level, terrain, tire choice, and riding style. The Trek Central app provides real-time range estimates based on your route and settings.

Are replacement or extra batteries available?

Yes. Trek distribution centers stock TQ batteries. Note: due to hazmat shipping regulations, batteries cannot be returned once purchased.

Can the battery be charged on or off the bike?

Yes. The battery can be charged while installed in the bike via the charge port on the seat tube. It can also be removed and charged separately, though battery removal is a more involved process (see below).

How long does a full charge take?

Approximately two hours for the 360Wh battery. Charge time for the 580Wh battery will be longer — refer to the TQ Quick Start Guide on the Trek Bikes manuals page for exact specs.

Service Manuals

Will the battery be damaged if it's left plugged in after it's full?

No. The battery management system stops charging automatically when full. However, never leave a charging battery unattended.

Will the battery be damaged if it fully discharges?

No, but you should charge it promptly. The battery can be damaged by being stored in a fully discharged state. If you aren't riding for three months or more, keep the battery above 30% charge.

Are there any special instructions for the first few charges?

Please note that the battery will only last to about 15% of its full capacity the first time it is depleted. So don’t be alarmed if the range on your first ride is a little shorter than expected. After the first full depletion and subsequent charging, the battery management system will “learn” what it needs to know and will deplete all the way to 0% on future rides. Also note that any time the battery reaches less than 10% charge, the motor output will be reduced to protect the battery. The battery level indicator will flash to indicate Low Battery mode.

How do I remove the main battery?

Battery removal requires some mechanical aptitude but is achievable by an experienced home mechanic in approximately 15 to 30 minutes: remove the drive unit cover, remove the drive unit, remove the screws holding the battery charge port in place, then remove the battery. Reinstall in reverse order. For most riders, we recommend having a Trek retailer handle battery removal and installation.

Does Domane+ SL have internal frame storage?

No. The battery is housed inside the downtube, which takes the place of internal storage found on some other bike frames.

What is the difference between the Trek Central app and the TQ app?

Trek Central does everything the TQ app does: motor tuning customization, range estimations, e-system diagnostics, and general e-system information. It also adds Trek-specific features: tire pressure recommendations, service reminders, turn-by-turn navigation with range awareness, and activity tracking. Trek Central is the recommended app.

Can I connect Domane+ SL to a Garmin or other cycling computer?

Yes. Domane+ SL pairs with most Bluetooth and ANT+ cycling computers, including Garmin, Wahoo, and others.

Can I customize the assist behavior?

Yes. Both the Trek Central and TQ apps allow you to adjust max power, assist factor, and pedal response per assist level. Changes can be reset to factory defaults at any time.

How many assist modes are there?

Three assist modes.

How do I switch between assist modes?

Mode-change buttons are mounted to the handlebars, so you can shift assist levels without taking your hands off the controls. On SRAM AXS-equipped bikes, the AXS bonus buttons can also be synced to control assist modes.

Can I ride Domane+ SL on light gravel or rail trail?

Yes. Domane+ SL is an all-road bike designed for everything from smooth pavement to rough roads and light crushed gravel. The 40mm tire clearance is a big part of what makes this possible.

Is a Range Extender available?

Yes. A Range Extender battery (160Wh) is available through your local Trek retailer. It mounts to the downtube bottle cage mounts. Range Extender batteries are not eligible for return by the retailer due to hazmat shipping regulations.

What additional parts do I need for the Range Extender?

You'll also need the power cable (5289576) and the retention strap (5299107). If the strap does not include four button head cap fasteners (W575056), contact Trek Customer Care.

How much extra range does the Range Extender add?

The Range Extender is 160Wh and adds approximately 40% more range on top of the 360Wh internal battery. The Range Extender is designed for use with the 360Wh battery configuration. If you are configuring a Domane+ SL 7 AXS or SL 9 AXS in Project One and want maximum range, the 580Wh battery option will give you approximately 115 miles without needing an external Range Extender.

Are all frame sizes compatible with the Range Extender?

Yes, but the Range Extender fits into a water bottle cage, so you will lose capacity for one bottle.

Can I ride with only the Range Extender installed (no main battery)?

Yes! Just leave the main battery behind and carry the 160Wh Range Extender in your carry-on. Always check with your airline before traveling to confirm compliance with current regulations.

How long does the Range Extender take to charge?

Approximately one hour.

What bottle cage should I use with the Range Extender?

Trek strongly recommends the Bontrager Side Load cage (5324465) with the retention strap (5325177). Other cages may fit but have not been tested. Always use the retention strap.

What is the maximum tire clearance?

Up to 40mm (measured with 4mm of clearance between tire and frame). With fenders installed, maximum tire width is 35mm.

Is Domane+ SL tubeless compatible?

Yes. All Domane+ SL bikes come with tubeless-ready wheels, tires, valves, and sealant.

What is the maximum rotor size?

Front: 180mm (minimum 160mm). Rear: 160mm (minimum 140mm).

What is the hub spacing?

100x12mm front (standard road thru-axle), 142x12mm rear.

What bottom bracket standard does Domane+ SL use?

T47, 85.5mm shell width.

Is Domane+ SL compatible with electronic drivetrains only?

Yes. Domane+ SL requires an electronic drivetrain — either Shimano Di2 or SRAM AXS. Mechanical drivetrains are not compatible.

What chainrings can I use?

Domane+ SL is compatible with the following (motor clearance limits max chainring size):

Shimano 2x: up to 52/36
Shimano 1x: up to 48T
SRAM 1x: up to 48T
Chainline: 46mm

Note: SRAM 2x is not listed as compatible. Do not exceed these limits as larger chainrings may contact the motor housing.

Why are these chainring limits different from the acoustic Domane SL/SLR?

The TQ HPR40 motor housing affects clearance at the bottom bracket area, which reduces the maximum chainring size compared to the acoustic Domane. Do not use chainring specs from acoustic Domane documentation for Domane+ SL.

Is the universal derailleur hanger (UDH) removable?

Yes. Domane+ SL uses a UDH (universal derailleur hanger) that is removable and replaceable. The hanger part number is W5271424.

Is the front derailleur hanger removable?

Yes. The front derailleur hanger assembly (5320961) is removable.

Is a dropper seatpost compatible?

No. Domane+ SL is not compatible with dropper seatposts.

What is the seatpost diameter?

27.2mm OD. The 330mm carbon seatpost comes in two offset options: 5mm and 25mm, which translate to 0mm and 20mm setback when installed on this generation of Domane.

What is the maximum seatpost length for each size?

400mm for every frame size.

What headset bearings is Domane+ SL compatible with?

Domane+ SL is compatible with RCS Pro, RCS Race, and RCS Universal headset bearing top covers. See the service manual for part numbers and full compatibility details.

Service Manuals

Is Domane+ SL compatible with the Trek RSL Aero integrated bar/stem?

No. The RSL Aero bar/stem from Madone is not compatible with Domane+ SL.

Is Domane+ SL compatible with RSL Aero water bottles?

Yes.

Does the switch lever (thru-axle lever) come with the bike?

No. The Switch lever (W5312899) is sold separately as an aftermarket part.

Does Domane+ SL have fender mounts?

Yes. All sizes are fender-compatible. Fender bridges: XS/S/M use W595608; ML/L/XL use W602256. Threaded fender stay mounts (W317707) are also included.

Does Domane+ SL have mounts for bags and accessories?

Yes. Frame (downtube) bag mounts, triangle bag mounts, and top tube bag mounts are included on all sizes except XS. Size XS is compatible with a triangle bag and top tube bag only. See the service manual for bag SKUs and compatibility by size.

How many water bottles fit in the frame?

Two bottles fit in all frame sizes without a bag installed. See the service manual for maximum bottle size compatibility by frame size.