Giant Defy Advanced E+ vs. Trek Domane+: Endurance E-Bike Comparison

Written by: Chris Van Leuven | August 19, 2026 | Time to read: 8 min

These are both endurance road e-Bikes, not electric commuters with drop bars. Giant and Trek use carbon frames, road-oriented geometry, integrated batteries, hydraulic disc brakes, and components you’d expect on high-end road bikes. But motor placement changes how they deliver assistance.

The Defy Advanced E+ Elite uses Giant’s SyncDrive Move Plus rear-hub motor. The motor weighs 1.7kg (3.7 lb), while the slim 400Wh EnergyPak battery weighs 2.3kg (5.1 lb) and disappears into the downtube.

Trek goes with a TQ HPR50 mid-drive and 360Wh battery. Instead of putting the motor in a wheel, the compact TQ unit sits around the bottom bracket (mid-drive) and sends its assistance through the drivetrain. Both approaches keep the bikes relatively light and visually close to traditional endurance road bikes. The difference is how that power reaches the rear wheel.

Giant’s SyncDrive Move Plus motor delivers its assistance directly to the rear wheel rather than through the chain, cassette, and derailleur, and lists a torque of 30 Nm. I wouldn’t compare that number directly to the Trek’s 50 Nm and conclude that the Giant is weaker. Hub motors and mid-drives deliver power differently, so the torque figures aren't useful on their own. More important is what Giant is trying to preserve: the feel of a performance road bike.

The motor responds to your pedaling while remaining independent of the drivetrain. That means your Shimano drivetrain still handles shifting much as it would on a non-electric Defy, and motor power isn't being fed through the chain and cassette. The 400Wh EnergyPak gives the Giant slightly more built-in battery capacity than the Trek. Giant also offers a 200Wh range extender, bringing total capacity to 600Wh for bigger days.

Giant says riders can reach 150km (93.2 miles) of range with the range extender under favorable conditions, but I wouldn’t plan a ride around a maximum-range claim. Climbs, wind, rider weight, speed, temperature, and assist level all affect battery range.

What I like about this setup is that Giant hasn't tried to reinvent the road bike. You get help when the road gets steep, or the wind gets strong, while most of the electric hardware stays out of the way.

Trek takes another route. Look behind the Domane+ SLR’s chainring, and there isn’t much visual evidence that a motor capable of helping you to 28 mph (Class 3) is hiding there. The TQ HPR50 sits around the bottom bracket, where its 50 Nm of torque is transmitted through the drivetrain. That lets the motor use the bike’s gearing along with you. Shift into an easier gear on a climb, and the motor benefits from that change in mechanical advantage, too. The TQ system is also remarkably compact for a mid-drive, which matters on an e-road bike where a bulky motor could change both its appearance and character.

Trek pairs it with a 360Wh internal battery and offers a 160Wh range extender. Trek estimates around 60 miles of range, although terrain and assistance level can change that considerably.

The motor's central position also keeps its weight low and near the middle of the carbon frame rather than in the rear wheel. That doesn't automatically make the Domane+ the better-handling bike, but it is a meaningful difference between the two designs.

Giant has the larger standard battery. Trek has the higher stated motor torque. Both provide Class 3 assistance up to 28 mph, and actual weight depends on the individual build. This is also where trim level matters. A Defy Advanced E+ Elite with Shimano 105 Di2 isn't directly comparable, component for component, to every Domane+ SLR. When shopping pre-owned, I’d focus on the complete bike rather than assuming the model family tells you everything.

Both bikes start with endurance geometry, but Giant and Trek take different approaches to smoothing out long rides. Giant uses its D-Fuse seatpost, designed to flex under load and reduce some of the vibration reaching the rider. Giant lists 12mm of flex action. There’s also clearance for tires up to 38mm, giving you room to add volume and lower tire pressure when comfort matters more than running a narrow road setup. Giant also makes the Defy Advanced E+ Elite AR specifically for rougher roads, with 38mm tubeless tires.

Trek uses rear IsoSpeed on the Domane+ SLR to give the rear of the bike a little more flex, helping take the bite out of rough pavement. The Domane has long been an endurance road bike designed for stability and comfort over long distances, and the electric version carries that approach over.

Domane+ builds can also lean farther into mixed-surface riding. Certified pre-owned examples on Upway have appeared with wider tires and more gravel-oriented setups, although the exact equipment varies by model year and trim.

Tires are worth paying attention to on either bike. Put a fast-road tire on one, and it can feel very different from the same bike on wider rubber meant for rough pavement and gravel. Neither is a substitute for a dedicated gravel bike if your rides regularly involve rough dirt. Still, both can run considerably wider tires than a traditional race bike, giving you more flexibility when the pavement gets rough.

If most of my riding were pavement, I’d take the Giant Defy Advanced E+ Elite. The rear-hub system makes sense for a bike that is still very much focused on road riding. You get a 400Wh battery, the option of another 200Wh, the flex built into Giant’s D-Fuse seatpost, and room for 38mm tires without adding much complication to the drivetrain. It would be my pick for long paved rides, sustained climbs, fast group rides, and for road cyclists who want assistance without moving too far away from the bike they already know.

I’d choose the Trek Domane+ SLR if my routes were harder to predict. The TQ mid-drive works through the gearing, rear IsoSpeed adds another layer of comfort, and the Domane+ platform lends itself well to rough pavement and occasional gravel.

If the ride starts on pavement but you’re the person who keeps wondering where that unpaved road goes, the Trek has an edge. That's really the choice. The Giant stays a little closer to a performance-minded endurance road bike. Trek leaves a little more room for the route to change.

These are expensive and technically complicated e-Bikes when purchased new, which makes certified pre-owned examples on Upway worth checking out. With Upway, you don't have to be an expert on diagnosing a TQ motor or determining whether a used EnergyPak battery is healthy when buying secondhand.

That’s because every e-Bike Upway sells goes through a professional 50-point inspection. Its mechanical systems are checked, while the battery, motor, and display are diagnosed. Components that don't meet Upway's standards are repaired or replaced, software is updated when applicable, and the bike gets a test ride and final quality-control check. That's useful with bikes like these, where the motor and battery can be difficult to evaluate from photos or mileage alone.

The individual listing is also important because Defy Advanced E+ Elite and Domane+ SLR builds vary. Check the model year, frame size, drivetrain, wheels, tires, battery, mileage, and inspection findings on the actual bike you're considering. And remember, certified pre-owned e-Bikes from Upway also include a 1-year warranty and a 14-day test-ride policy.