I find that the sizing isn't the issue. The issue is the stigma attached to an adult riding a bike with 20" or smaller wheels. I've gotten many positive comments, but I'd also gotten the crass individual who tells me to get an adult sized bike,... before I breezed past them on their supposed adult size ride.
It's all about acceptance, and people in the USA think smaller wheeled bikes are for children only.
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If it wasn't for you meddling kids,...