The new Domane+ SLR is Trek’s lightest electric road bike and has increased gravel potential

Motor-assisted Domane is claimed to be 1.8kg lighter with wider 40mm tyre clearance

Trek Domane+ SLR electric road bike

Trek claims to have shaved nearly 2kg from the new Domane+ SLR by using its top-level carbon frame material for the first time on an electric bike, alongside a lightweight motor system.

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The Domane+ SLR is Trek’s first electric bike to use its highest-grade 800 series OCLV carbon. The frame is a claimed 700g lighter than the previous Trek Domane+.

The brand says the compact TQ HPR50 ebike system, used on the Trek Fuel EXe electric mountain bike, also helps reduce weight.

The Domane+ SLR now has clearance for 40mm tyres (or 35mm with mudguards), up from 38mm. It also shares the rear IsoSpeed system and a number of other frame features with the non-assisted Domane.

New TQ ebike system

The TQ e-system motor fits into the bottom bracket.
Trek

Trek says the Domane+ SLR’s TQ HPR50 ebike system has a 360W/h battery to provide assistance up to 28mph in the US and 25km/h in Europe.

The battery has a claimed range of 100km in Eco mode and charges fully in 2.5 hours, according to Trek. The battery can’t be removed.

The 160W/h range extender is sold separately for $599 via local Trek dealers. It adds about 50km of battery life, according to Trek, and fits into the seat tube bottle cage.

Trek says the TQ system has a 300-watt motor and delivers 50Nm of torque, which is less powerful than the 55Nm offered through a Fazua Evation motor on the previous Domane+.

You can switch assist modes without taking your hands off the bars.
Trek

The TQ motor’s three assist modes are controlled with shifters on the hoods, and the modes themselves can be customised in the Trek Central app, according to Trek.

The Harmonic Pin Ring system (HPR) is built around the bike’s bottom bracket ball bearings, according to TQ.

The brand claims this simpler system virtually obscures the motor and is quieter, more efficient and more reliable than other electric bikes. The majority of systems use an electric motor, belts, cog wheels and gears to transmit power.

Trek adds that the Domane+ SLR is one-and-a-half to two times quieter than its previous electric road bikes.

Domane in name and nature

Non-adjustable rear IsoSpeed and aero tube shapes come from Trek’s road bikes.
Trek

Like the new, unassisted 2023 Trek Domane, the Domane+ SLR has non-adjustable rear IsoSpeed situated at the top tube / seatpost junction.

Trek says the Domane+ has the same fork, D-shaped seatpost and integrated cable routing as the Domane SLR.

The Domane+ SLR has hidden mudguard mounts and its integrated RCS Pro stem is Blendr-compatible.

This allows you to attach accessories such as bike computers and road bike lights to the stem while leaving your handlebar clear.

The top tube display is one of few giveaways that this is an electric bike.
Trek

However, the electric version doesn’t have internal down tube storage or top tube bag mounts, in order to make room for the TQ display.

Trek claims the Domane+ SLR’s Q-factor of 163mm gives a similar feel to a non-assisted Trek road bike.

The Domane+ SLR’s H2 endurance road bike geometry comprises a taller head tube and longer wheelbase for more comfort and stability than the racier H1.5 geometry on the Trek Madone SLR 9 eTap.

Trek Domane+ SLR models and spec

The stock 40mm-wide tyres on the SRAM models leave 6mm either side.
Trek

The Domane+ SLR range is only compatible with electronic groupsets.

There’s a choice of 2x Shimano drivetrains, from 12-speed 105 Di2 to Dura-Ace Di2, or 1x SRAM XPLR from Rival eTap up to Red eTap. The SRAM-equipped models come with 700 x 40c gravel tyres.

The range starts with the Trek Domane SLR+ 6 at £8,890 / €9,599 / $8,999 / AU$12,499.99.

The top-of-the-range Trek Domane SLR+ 9 eTap costs £12,900 / €14,499 / $12,999 / AU$18,499.99.

Chainring options include 1x SRAM X-Sync from 36t to 46t with 107 BCD, or Shimano double chainrings in 48/36t, 50/34t or 52/36t.

All Trek Domane+ SLR models come with tubeless-ready Bontrager wheels and tyres set up tubeless.

Trek Domane+ SLR 9 eTap

  • Price: £12,900 / €14,499 / $12,999.99 / AU$18,499.99
  • Frameset: Trek Domane+ SLR, 800 Series OCLV Carbon
  • Motor: TQ HPR50
  • Battery: TQ 360Wh
  • Drivetrain: SRAM RED eTap AXS, 12-speed
  • Wheelset: Bontrager Aeolus RSL 37V
  • Tyres: Bontrager GR1 Team Issue
  • Seatpost: Domane carbon seatpost
  • Handlebar: Bontrager Pro IsoCore VR-SF
  • Saddle: Bontrager P3 Pro, short nose
  • Claimed weight (size 56): 12.15kg

Trek Domane+ SLR 9

Choose from 12-speed Dura-Ace or SRAM Red eTap AXS on the top two models.
Trek
  • Price: £12,500 / €13,999 / $12,999.99 / AU$18,499.99
  • Frameset: Trek Domane+ SLR, 800 Series OCLV Carbon
  • Motor: TQ HPR50
  • Battery: TQ 360Wh
  • Drivetrain: Shimano Dura-Ace R9270 Di2, 12-speed
  • Wheelset: Bontrager Aeolus RSL 37V
  • Tyres: Bontrager R3 Hard-Case Lite
  • Seatpost: Domane carbon seatpost
  • Handlebar: Bontrager Pro IsoCore VR-SF
  • Saddle: Bontrager P3 Pro, short nose
  • Claimed weight (size 56): 11.75kg

Trek Domane+ SLR 7 eTap

The SRAM eTap models have Bontrager GR1 gravel tyres.
Trek
  • Price: £9,750 / €10,999 / $9,999.99 / AU$14,499.99
  • Frameset: Trek Domane+ SLR, 800 Series OCLV Carbon
  • Motor: TQ HPR50
  • Battery: TQ 360Wh
  • Drivetrain: SRAM Force eTap AXS, 12-speed
  • Wheelset: Bontrager Aeolus Pro 3V
  • Tyres: Bontrager GR1 Team Issue
  • Seatpost: Domane carbon seatpost
  • Handlebar: Bontrager Pro IsoCore VR-SF
  • Saddle: Bontrager P3 Pro, short nose
  • Claimed weight (size 56): 12.50kg

Trek Domane+ SLR 7

Deep Smoke is the darkest colour scheme.
Trek
  • Price: £8,900 / €9,999 / $9,499 / AU$14,499.99
  • Frameset: Trek Domane+ SLR, 800 Series OCLV Carbon
  • Motor: TQ HPR50
  • Battery: TQ 360Wh
  • Drivetrain: Shimano Ultegra R8170 Di2. 12-speed
  • Wheelset: Bontrager Aeolus Pro 37
  • Tyres: Bontrager R3 Hard-Case Lite
  • Seatpost: Domane carbon seatpost
  • Handlebar: Bontrager Pro IsoCore VR-SF
  • Saddle: Bontrager P3 Pro, short nose
  • Claimed weight (size 56): 12.20kg

Trek Domane+ SLR 6 eTap

The range has identical finishing kit apart from wheels.
Trek
  • Price: £8,900 / €9,999 / $8,999.99 / AU$14,499.99
  • Frameset: Trek Domane+ SLR, 800 Series OCLV Carbon
  • Motor: TQ HPR50
  • Battery: TQ 360Wh
  • Drivetrain: SRAM Rival eTap AXS, 12-speed
  • Wheelset: Bontrager Aeolus Pro 3V
  • Tyres: Bontrager GR1 Team Issue
  • Seatpost: Domane carbon seatpost
  • Handlebar: Bontrager Pro IsoCore VR-SF
  • Saddle: Bontrager P3 Pro, short nose
  • Claimed weight (size 56): 12.60kg

Trek Domane+ SLR 6

All the bikes with Shimano drivetrain are 2x.
Trek
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  • Price: £8,890 / €9,599 / $8,999 / AU$12,499.99
  • Frameset: Trek Domane+ SLR, 800 Series OCLV Carbon
  • Motor: TQ HPR50
  • Battery: TQ 360Wh
  • Drivetrain: Shimano 105 R7170 Di2, 12-speed
  • Wheelset: Bontrager Aeolus Pro 37
  • Tyres: Bontrager R3 Hard-Case Lite
  • Seatpost: Domane carbon seatpost
  • Handlebar: Bontrager Pro IsoCore VR-SF
  • Saddle: Bontrager P3 Pro, short nose
  • Claimed weight (size 56): 12.40kg