A:AnswerThe Pace 500 ST S/M is recommended for 4’11” - 5’8” riders. The M/L is recommended for 5’8” - 6’1” riders. If you’re 5’8” right between the two sizes we recommend going with the M/L
A:AnswerHello, the Top Speed Settings can be changed on the display. Please see our blog post for additional information linked here: https://www.aventon.com/blogs/aventon_bikes/difference-between-a-class-123-ebike
We hope this helps! Ivy