59
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.
This is exactly right. Amazon has hundreds of mandatory fields that sellers must complete to sell their products on the site and if any are missing then Amazon will remove the products from sale. Of course the mandatory fields change on an almost daily basis and often make no sense. Sellers must jump through the hoops or get the boot.
I was utterly confused since I'd never seen fucking tires be gendered before, makes sense if it's some Amazon nonsense