you can make your own set of airless bike tires using PVC pipes, bolts and nuts
SE Bikes Bozack 29 X 2.4 Tire | Stacked BMX shop — Stacked BMX Shop
BICYCLE TIRES 700 X 28C SUPER HIGH PRESSURE FITS ROAD RACING BIKES & O – Bicycle Heaven
Airless Bicycle Tire
anna 14'' Kids Bike Replacement Tires - Fits Most Kids Bikes, Electric Scooter Tyre 14x2.125(57-254) Solid Tire Puncture-proof - Made from BPA/Latex Free Premium-Quality Butyl Rubber - Walmart.com
SOLID RUBBER TIRES ** - Is This The Future Of Bmx? - YouTube
Tubeless? Nah... These Are Airless Tires! - bturman - Mountain Biking Videos - Vital MTB
How to Choose Airless Bike Tires - TreadBikely
Amazon.com : SENQI Fixed Gear Bicycle Solid Tires Road Bike Tires 700c x 23 (Black) : Sports & Outdoors
Are airless bike tires the answer for reliable commuting? | Cycling Weekly