Lifting and carrying the Shift S1 is possible thanks to its compact fold and relatively low weight.
An expert quickly reaches 20mph on flat ground.
Testers say the 2.5" tires help smooth out minor road imperfections.
Reviewers find the throttle cruise control useful on long, straight roads.
Testers describe the Shift S1 as fairly comfortable for a 16" folding e-bike.
The handlebars are height-adjustable.
The Shift S1 has bosses for mounting a water bottle holder and a rear rack, and it's compatible with a rear derailleur.

10 reasons not to buy

An expert raises concerns about the single-stage frame and handlebar clamps, which have a higher likelihood of coming loose than the typical two-stage clamps.
The Shift S1's range is poor. One tester covers just six miles in a range test.
GOTRAX strongly advises against using the bike in wet weather, as water damage is not covered by warranty, limiting the bike's usefulness as a commuter.
Reviewers say the unbranded 350W front hub motor is very loud.
A tester complains that pedal assist is jerky, making it hard to control the bike while pedaling at low speeds.
The throttle is not active while stationary.
Reviewers complain that the display is hard to read in direct sunlight and provides limited information.
The Shift S1 doesn't have lights, fenders, a rear rack, or a kickstand.
Several GOTRAX buyers report poor quality control, disappointing customer support, and bikes breaking with little use.
The battery cannot be locked, so it must be removed when locking the bike outside.

Bottom line

The GOTRAX Shift S1 is a budget folding e-bike with a 350W motor and 187Wh battery. At 40lb, it's relatively portable when folded. The weak motor and small battery are only suitable for short, flat journeys. Testers find the bike reasonably comfortable, but its limited single-speed gearing and lack of water resistance and commuting accessories limit its practicality. Additionally, reports of broken handlebars and a failed stem clamp raise serious safety concerns. Many GOTRAX buyers report issues with failed parts and "horrible" customer service. Even the Shift S1's budget price tag isn't justified, given its flaws.