Aima AIMA Big Sur Review: A Fat-Tire Cruiser That Runs Out of Breath on the Steepest Hills It's a solidly built, reasonably priced fat-tire e-bike for flat-to-moderate terrain, but independent hill-climb testing found it struggled on a steep grade from a standing start — so West Linn riders planning to tackle Hidden Springs Drive or Sunset without a rolling start should treat that as a re