If you are looking for a tire for your Segway model x2, you can usually find them at good prices on Ebay. The listings below are current Ebay listings for tires for Segway model x2.
Tires for Segway X2 on Ebay:
NEW ORIGINAL SEGWAY x2 Tire Wheel Kit 1 ONE 20964 00001
Time Remaining: 8d 16h 31m
Buy It Now for only: $295.00
pair of new segway golf tires and rims for x2 turf 20749 00001 kit with rack
Time Remaining: 27d 19h 2m
Buy It Now for only: $1,499.00