Razors proud to introduce they're new and improved 100 PSI High Pressure dirt scooter tire! Due to its new and innovative side wall casing design, its now the fastest rolling dirt scooter tire out on the market. The new side wall casing is now 30% thicker than previous designs with an increased TPI thinckness for a remarkably longer life span. Compatable with all 200mm x 50mm hubs. Come get em while supplies last!