Tern NBD S5i vs Aventon Pace 4

What the Tern is really buying you

Tern says the NBD S5i has an ultra-low 39 cm standover, low center of gravity, Bosch Performance Line support up to 65 Nm, a Gates belt drive, and a shareable fit range from 4'10" to 6'3". Those details all point in the same direction: make the bike easy to get on, easy to control, and easy to keep using for years.

This is not just a comfortable bike. It is a bike built to reduce awkward moments. That makes it especially good for smaller riders, older riders, or households where one bike has to work for very different people.

What the Pace 4 does so well

Aventon's current Pace 4 is a smarter, more feature-rich comfort bike than the older cruiser formula. Aventon highlights Sensor Switch, integrated rear-wheel lock, alarm and unusual-activity detection, 4G/GPS-connected features through the ACU, and a removable battery with cross-model compatibility. That makes it a very attractive bike for everyday city riding where comfort, tech, and value matter more than premium accessibility geometry.

The Pace 4 is also easier to justify if you want one upright city bike for recreation, errands, and moderate commuting without moving into premium specialty-bike pricing.

Where the Tern wins

• Easier mounting and stopping: The ultra-low step-through design is the big difference.
• Lower-maintenance drivetrain: Belt drive and internal gearing make everyday ownership cleaner and quieter.
• Better shareability: The fit range and fast adjustments work well in mixed households.
• Dealer-first support: Bosch service structure and Tern's dealer ecosystem are still a meaningful long-term advantage.

Where the Pace 4 wins

• Price: This is the biggest practical advantage.
• Smart security features: Integrated lock, alarm, GPS-linked functions, and app controls are real everyday perks.
• Cruiser comfort without feeling old-fashioned: It is a good fit for riders who want upright comfort but still want useful modern features.
• More casual value: It does a lot without demanding specialty-bike money.

Who should buy the Tern

Buy the NBD if your real concern is confidence: mounting ease, lower-speed control, apartment storage friendliness, or making one bike work for a very broad fit range. It is also the better pick if you prioritize low-maintenance premium ownership over feature count.

Who should buy the Pace 4

Buy the Pace 4 if you want a comfortable city e-bike that feels modern, secure, and easier on the budget. It is the better answer when you do not need the Tern's specialized geometry and you value smart features more than premium drivetrain hardware.

Bottom line

The Tern NBD S5i is better when ease, confidence, and polished ownership are the real job. The Aventon Pace 4 is better when the job is comfortable city riding with modern features for less money. Buy the NBD for a reason. Buy the Pace when you want comfort and value.

What changes after the first month

The NBD makes more sense when the rider is solving awkward starts, awkward stops, or awkward mounting every single day. Tern’s ultra-low standover, low center of gravity, and belt-drive setup help because they reduce the little annoyances that pile up: getting on in work clothes, restarting at a light, maneuvering in a hallway, and keeping the drivetrain cleaner over time. That is why the NBD is easier to justify for older riders, shorter riders, or households where the “right” bike is the one that gets used without hesitation.

The Pace 4 makes more sense when the rider is already comfortable on a normal upright city bike and wants a nicer everyday experience for less money. Aventon’s current smart-security package, removable battery, and comfort-first ride feel are meaningful daily advantages. The main caution is that the Pace is still a mainstream comfort bike, not an accessibility-focused one. Buy the Tern when confidence is the limiting factor. Buy the Pace when the rider is already confident and mainly wants comfort, security features, and value.