Trek has today announced the third generation of its Domane+ e-assist road bike, and it’s quite the change from the one that came before. There’s a new motor from German company TQ, a brand-new carbon fiber frame with more advanced carbon fiber content and construction, more tire clearance, and in general, a sleeker and lighter total package that looks and feels more like a “regular” road bike.
It sounds like quite the complete package on paper, and it mostly is in reality – with some caveats, of course.
The lightning pace of e-bike motor development
Trek clearly isn’t shy about switching motor suppliers. Each generation of the Domane+ has used a different brand of motor: Bosch on the first generation one, Fazua on the second iteration, and now TQ on this latest third-generation model.
Why the switch, you wonder? Because it seems like quite the advancement in a number of key areas.
First and foremost, the TQ HPR-50 motor is legitimately tiny, so much so that in profile, you almost wouldn’t guess at all that the Domane+ is an e-bike. Unlike the previous Bosch and Fazua units, the TQ is hidden completely inside a painted-to-match shroud at the bottom bracket with little on the outside to give anything away. Of course, a closer look reveals clues such as the cooling port on the underside of the cover, but even the battery is fully integrated inside the down tube.
Trek is also touting the HPR-50’s unusually quiet operation, which comes about thanks to a unique interior configuration that does away with the usual array of reduction gears and/or belts, and is claimed to reduce internal friction, too. Trek’s official press materials also make mention of the lower Q-factor as compared to the Fazua unit, but don’t get too excited; it’s only down 2 mm in total, and the 163 mm figure is still about 12 mm wider than what you get with Shimano GRX, or 17 mm wider than most dedicated road cranks.
Be that as it may, the specs of the TQ HPR-50 motor are impressive. The official maximum power output is 300 W (or 50 Nm of torque), and it’s powered by a 360 Wh Li-ion battery in the down tube that Trek claims is good for “up to” 145 km (90 miles) in Eco mode. An optional range extender battery tucks into a water bottle cage for another 160 Wh, and the system can even run on just the range extender battery alone should you want to fly with your new Domane+ and need to tuck in under typical airline battery size restrictions.
Three levels of e-assist are available, each of which can be customized using the Trek Central smartphone app. Switching between the three assist levels is literally at your fingertips thanks to convenient remote buttons positioned next to the brake lever hoods, while the various mode screens on the high-resolution LCD panel on the top tube are accessed directly on that panel. Among the available screen pages are windows for remaining battery life (expressed numerically as both a percentage and time to empty, and visually with bars), current power output, speed, and distance – and when you’re charging the system, the display even gives you a precise countdown to when the battery is full.
Frame design implications
The bigger benefit of switching to the TQ HPR-50 motor is arguably how it affects the latest Domane+’s frame design. Trek sought to have this version look as much like a non-powered bike as possible, and aside from some generally inflated proportions, that goal seems to have been met.
The motor’s smaller form factor makes for a more normal-looking bottom bracket area, and although the down tube is notably bulbous given the internally housed battery, the whole frame looks surprisingly proportional. The Q-factor may not have changed much, but the more typical chainline has allowed Trek to switch to a standard 142 mm-wide rear hub in place of the “Road Boost” 148 mm one on the previous-generation Domane+, which is a great move for wheel compatibility.
The 2023 Domane+ marks the first time Trek has used its top-end OCLV 800 carbon fiber content. Combined with the integrated down tube battery – meaning there’s no need for a large hatch – Trek claims to have lopped 450 g from the previous Domane+ chassis. Claimed weight for an unpainted 56 cm frame is around 1,250 g. Adding to that is 1,850 g for the motor, 1,835 g for the 360-Wh battery, plus a few more grams for mounting hardware.
That claimed frame weight includes the latest version of Trek’s IsoSpeed pivoting seat cluster concept. This incarnation isn’t adjustable, but it does use a conventional (albeit proprietary) telescoping carbon fiber seatpost instead of the integrated seatmast of previous IsoSpeed-equipped bikes.
All in, my 52 cm flagship sample with a SRAM Red eTap AXS wireless electronic 1×12 groupset and Bontrager Aeolus RSL 37V carbon clinchers tips the scales at a comparatively svelte 12.21 kg (26.92 lb).
Save for a 10 mm increase in chainstay length – a consequence of the TQ HPR-50’s motor casing size – frame geometry is the same as the non-powered Domane, down to the millimeter. Stack and reach figures are more upright and relaxed as compared to the Madone or Emonda, but both are still pretty sporty overall, and trail figures in the low-60s across the board are intended to provide fairly nimble handling manners.
Despite those virtually identical dimensions, the Domane+ is approved for tires up to 40 mm-wide, whereas the non-powered Domane tops out at 35 mm. Keep in mind those are Trek’s official ratings, which account for a minimum of 6 mm of space all around. Actual maximum tire sizes will almost certainly be bigger, though that’ll depend on your comfort level for potential frame rub.
Either way, adding fenders to the hidden front and rear mounts will drop that maximum tire size by 5 mm.
Naturally, cabling is fully hidden, although the manner in which Trek has gone about it for the new Domane+ isn’t nearly as maddening as it could have been. Lines are run externally on the handlebar before being routing alongside the underside of (not through) the stem and then into ports in the dedicated upper headset cover. Keeping things visually tidy are a cosmetic cover bolted to the bottom of the stem and profiled headset spacers that are also split for easier bar height adjustment.
Models, availability, and pricing
Trek will offer the new Domane+ in six different build kits, all using the same frame and motor package. There are only three price points, though, with each one offering a SRAM and Shimano variant. Interestingly, all SRAM-equipped bikes will come with 1×12 drivetrains and 40 mm-wide Bontrager gravel tires, while Shimano bikes are set up with 2×12 drivetrains and more tarmac-oriented 32 mm-wide slicks. As usual for Trek’s premium models, Project One custom builds are available in most models, although whichever way you slice it, the prices are awfully high.
Topping the list is the Domane+ SLR 9 eTap P1 (US$13,000 / AU$n/a / £12,900 / €14,500), built with a SRAM Red eTap AXS 1×12 electronic groupset, 25 mm-wide Bontrager Aeolus RSL 37V carbon clinchers, and 40 mm-wide Bontrager GR1 Team Issue gravel tires. Claimed weight is 12.15 kg (26.79 lb).
Sitting alongside that is the Domane+ SLR 9 P1 (US$13,000 / AU$n/a / £12,500 / €14,000), equipped with a Shimano Dura-Ace Di2 2×12 electronic groupset, 21 mm-wide Bontrager Aeolus RSL 37 carbon clinchers, and 32 mm-wide Bontrager R3 Hard-Case Lite slicks. Claimed weight is 11.75 kg (25.90 lb).
The middle child is the Domane+ SLR 7 eTap P1 (US$10,000 / AU$n/a / £9,750 / €11,000) with a SRAM Force eTap AXS 1×12 electronic groupset, 25 mm-wide Bontrager Aeolus Pro 3V carbon clinchers, and 40 mm-wide Bontrager GR1 Team Issue gravel tires. Claimed weight is 12.50 kg (27.56 lb).
Alternatively, the Domane+ SLR 7 P1 (US$10,000 / AU$n/a / £9,450 / €10,600) comes with a Shimano Ultegra Di2 2×12 electronic groupset and the same wheel-and-tire package. Claimed weight is 12.20 kg (26.90 lb).
There’s also a slightly less expensive non-Project One Domane+ SLR 7 (US$9,500 / AU$14,500 / £8,900 / €10,000).
Looking for the fancy TQ motor on a “budget”? The Domane+ SLR 6 eTap P1 (US$9,000 / AU$n/a / £8,900 / €10,000) is equipped with SRAM’s Rival eTap AXS 1×12 electronic groupset, 25 mm-wide Bontrager Aeolus Pro 3V carbon clinchers, and 40 mm-wide Bontrager GR1 Team Issue gravel tires. Claimed weight is 12.60 kg (27.78 lb).
If you prefer Shimano, there’s the Domane+ SLR 6 P1 (US$9,000 / AU$n/a / £8,890 / €9,600) with the same wheel-and-tire package, but Shimano’s latest 105 Di2 2×12 electronic groupset. Claimed weight is 12.40 kg (27.34
Finally, there’s the non-P1 Domane+ SLR 6 (US$8,500 / AU$13,000 / £8,340 / €9,000).
All of the new Domane+ models are supposedly available for ordering and/or purchase starting today.
Like an ever-present hand on your back
I should first point out in this review that your own experience on the new Domane+ will vary greatly depending on where you are. In the US, the TQ HPR-50 motor is allowed to operate at full power up to 45 km/h (28 mph). However, the cutoff in Europe is just 25 km/h, while most other countries will be at various points in between. I did this test in the United States, so take my commentary with a grain of salt if you live in a different region.
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