Diem 20 20mph

The Diem lineup is split into three tiers, available in either 20 mph or 28 mph configurations. The entry-level Diem 30 uses a traditional Shimano Cues nine-speed derailleur drivetrain and a standard chain. This build represents the strongest value for riders who prefer the tactile feedback and simplicity of mechanical shifting.

Moving up to the Diem 20 introduces a low-maintenance Gates carbon belt drive paired with a Shimano Nexus five-speed internal gear hub. This setup eliminates chain grease and reduces routine drivetrain maintenance, making it highly practical for daily, all-weather commuting.

The flagship Diem 10 upgrades to an Enviolo Automatiq continuously variable hub, which shifts gears automatically based on rider cadence. The 10 also includes a suspension dropper seatpost and steps up to four-piston Shimano MT420 brakes, compared to the two-piston MT200 brakes found on the lower tiers. All builds share the same core aluminum frame, carbon fork, integrated lighting, and 50mm tires. Notably, the bikes omit a traditional digital display, instead providing a minimalist handlebar controller and a stem-mounted smartphone bracket with an integrated USB-C charging port.

Reviewers consistently praise the Diem for its agile, responsive nature in heavy traffic, noting that the motor integration and weight distribution make it feel surprisingly nimble. The bike accelerates quickly and maintains speed well, with testers highlighting how easily it navigates tight city streets. Handling is frequently described as precise, allowing riders to "chuck it about" (Autotrader) when navigating obstacles. At higher speeds, the chassis remains highly composed, tracking cleanly through sweeping corners without speed wobble.

Opinions diverge sharply on the frame's ride quality over rough surfaces. While Orbea designed the frame to flex and absorb vibrations, several testers found the ride "rather stiff" (Downtown-mag) on cobblestones and broken pavement. The lack of active suspension means the bike relies heavily on its high-volume tires to mute road chatter. Consequently, reviewers suggest running lower tire pressures to maximize comfort.

The drivetrain options also draw mixed reactions. The traditional derailleur and internal hub gears are widely appreciated for their direct feel and reliability. Conversely, the automatic shifting system on the flagship model frustrated some riders, with one tester calling the initial setup "unnecessary faff" (T3) and noting a disconnect between pedaling effort and actual speed. Despite these critiques, the consensus points to a highly refined, "purpose-driven machine" (GearJunkie) that excels on paved commutes.