Read the manual?
https://cdn.shopify.com/s/files/1/0202/9884/files/WTB_Tire_User_ManualOctober112016v4.pdf?10773973970830603384
Out of date so doesn’t include the resolute tyre, and doesn’t predict tyre size with respect to internal rim width
Measure the outer edge of the tyre bead to bead, take some string, mock up size/shape inflated by holding ends of string rim width apart and making a circle?
@dancing james started
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Read the manual?
https://cdn.shopify.com/s/files/1/0202/9884/files/WTB_Tire_User_ManualOctober112016v4.pdf?10773973970830603384