AIMA includes everything you need for a solid solo ride or one with a child or tween. The Big Sur U is sporty, handles well, and delivers one of the best brake results we’ve recorded.

The AIMA Big Sur U wasn’t what Harry Dacre pictured when he sang about Daisy Bell looking sweet upon a bicycle built for two, but I can assure you this bike is far more fun than anything he imagined. AIMA designed the Big Sur U as a true two-person mover; a utility bike that comes fully outfitted with a passenger setup so you can comfortably bring a plus-one.
It ships with a welded rear rack, a padded cushion, wheel guard, and foot pegs so you can transport a second rider with confidence. The 750W hub motor supports the added payload with ease and can switch between a natural torque-based feel or a more relaxed cadence-based one. You can fine-tune the responsiveness inside the Bafang Go+ app to match how lively you want the ride to be.
AIMA added several helpful features that make two-up riding simpler: shorter-diameter, wide-base 20×3.5” tires with a hybrid tread, oversized hydraulic brakes with 203mm rotors, and the stable handling that comes from BMX-style handlebars. The bike also covers safety nicely. You get turn-by-turn navigation on the TFT display, integrated lights, turn signals, and a horn for riding in traffic.
The whole approach is straightforward and mostly well executed. There are a few settings worth adjusting in the app right out of the box, and the fork can dive a bit in turns when carrying extra weight (easily solved by locking it out). Beyond that, the Big Sur U sticks the landing as a fun, punchy bike to ride solo and an easygoing machine to ride in tandem.
Let me know if you want an alternate version, something shorter for YouTube, or a version that leans more playful or more technical.
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