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Unisex? Are there gendered bicycle tires???
(hexbear.net)
What 
spoiler
Also these product names are brilliant- "Billy Bonkers"
That's not how Schwalbe markets them on their own site. If I had to guess, Amazon probably has a field for all bike-related merchandise where you have to indicate the "gender" of bikes they're usable on, even if it doesn't make sense.
I was utterly confused since I'd never seen fucking tires be gendered before, makes sense if it's some Amazon nonsense