[XL POWER] XL70T25 8MM tail belt upgrade for V1 tail

If you have v1 tail (which is what the standard 700 comes with), upgrade to 8mm v1 using XL70T25.

If you have v3 tail (which comes on the World Champion edition, or if you upgraded to v3 yourself), upgrade to 8mm v3 with XL70T26 (17T) or XL70T26-1 (16T).