Summary
If nearly all your riding is paved, an electric road bike gives you the lower weight and faster-rolling tires; if a regular route includes gravel roads or rough dirt, a gravel bike's wider tires and extra mounts are the reason to choose one. The boundary is looser than the names suggest. Trek's Domane+ is sold as an electric road bike yet takes tires up to 40 mm and is pitched for rides "from pavement to crushed gravel," so tire clearance on the exact model tells you more than the category label.
What each type is built around
Trek's road bike buyer's guide draws the lines by tire. Race-focused road bikes use tires that "typically come in sizes up to 28mm" and are "designed to roll fast and corner hard on paved roads." Bikes with "relaxed and endurance-focused geometry" can take "up to 45mm of tire clearance" for traction and control "on tarmac, gravel, and dirt." Gravel bikes are described as "true 'jack-of-all-trades' bikes" for surfaces "from gravel to pavement and even light singletrack," with clearance "to accommodate larger, more stable tires" and room for "bags, racks, and fenders."
Set against a weekly route, those descriptions give rough bands. Tires up to about 28 mm belong on smooth pavement. A road frame with 40 mm clearance, like the Domane+, covers paved roads with stretches of crushed gravel. Rougher dirt is gravel-bike territory, and Trek points riders who want "purebred electric gravel" to a separate model, the Checkpoint+. For gearing, Trek's guide describes SRAM Apex as having "wide gearing, great for riding offroad."
One road e-bike, two builds
Trek's Domane+ line shows how much weight and range vary within a single road model.
| Domane+ SL (carbon) | Domane+ ALR (aluminum) | |
|---|---|---|
| Motor | TQ HPR40 | TQ HPR60 |
| Battery | 360 Wh or 580 Wh (SL 6: 360 Wh only) | 360 Wh |
| Claimed range in Eco mode | Around 70 miles (360Wh) or 115 miles (580Wh) | Around 60 miles |
| Total weight | 24.5 lb | 31.4 lb |
| Assist | Up to 28 mph | Up to 28 mph |
Trek notes that range "varies by route, rider, and terrain" and that weight "varies by model." A 160Wh range extender that sits in a bottle cage is offered for longer rides, which Trek says allows about 90 miles in Eco mode, without stating which main battery that figure assumes.
Riding above the assist limit
The Domane+ assists up to 28 mph, the Class 3 limit. On a fast descent or in a quick group, riders spend time above that speed with no motor help, and the gap between a 24.5 lb build and a 31.4 lb build is then carried on leg power alone.
A recall on some 2026 models
In December 2025 Trek recalled about 700 model-year 2026 Domane+ ALR 5, Domane+ ALR 6 AXS, Checkpoint+ SL 6 and Checkpoint+ SL 7 e-bikes because "the bolts on the chainring can come loose, causing the chainring to separate from the bike." The recalled bikes were sold from July through September 2025. The remedy is a free repair at an authorized Trek dealer, and the Domane+ SL is not on the list.
Sources
- Trek Bicycle: Domane+
- Trek Bicycle: Road Bike Buyer's Guide
- U.S. Consumer Product Safety Commission: TREK Recalls Electric Bicycles Due to Fall or Crash Hazard (Dec. 11, 2025)
Data checked, sources, and what we did not test
Data checked: 2026-09-24. Figures and quotations were read on that date from the pages listed under Sources and can change without notice.
Sources: manufacturer, retailer and public-agency pages, listed above. No review sites, forums or retailer ratings were used.
What we did not test: ride quality, brake feel, real-world range, durability and customer service. We have not ridden these bikes and publish no ratings or rankings.