XL70T26 17T 8MM tail belt upgrade for WC kit

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 with XL70T26 (17T) or XL70T26-1 (16T).