Regarding flat tires on a bike - I have to endorse Amerityre's products here (as a satisfied customer - at least when I last rode a bike): https://amerityre.co

Regarding flat tires on a bike - I have to endorse Amerityre's products here (as a satisfied customer - at least when I last rode a bike): https://amerityre.com/our-flat-free-products/flat-free-bicycle-tires/ https://amerityre.com/our-flat-free-products/flat-free-bicyc... They aren't cheap, but they also aren't your standard airless, flat-free tire, either. They don't feel like "mush" when you ride on them, making you have to pedal harder - they feel identical to a regular air-filled bicycle tire. You can drill a hole through them, and they still feel and work perfectly fine. If you ride a bike and tend to get a lot of flats, take a look into their products - you won't be disappointed.