They might be great miniatures and the bikes definitely fit the anime asthetic but they just don't gel with the riders for me. When I think American wilderness and frontier towns I don't think of bikers, I think of cowboys. Do cowboys ride bikes? Not a chance. Bikes run of petrol (or gas, in USAriadna), can't easily traverse difficult terrain and can break down. What you want is a horse.
I man come on, just look at the concept art. Sure, fluff-wise the Ariadnans probably wouldn't initially have had horses, but I'll be damned if that will stop me. Plus given all the other 'American' tropes they've tried to fit into I can bet they'd have imported some as soon as they had a chance!
|Wide brimmed hat, poncho, holstered pistol. Check, check and check.|