Mix together spices and olive oil in mixing bowl. Make shallow slits along the meat and rub in spice mixture. Place in a resealable bag anywhere from 4 hours to overnight.
Preheat grill and slide tri-tips onto the rotisserie skewer. Secure prongs and place on the grill on high heat for 20 minutes. Reduce heat to medium-high for the remainder of the cooking time or when the internal temperature is between 150 to 165 degrees F/65 to 75 degrees C.
Allow the roast to rest for 15 minutes before slicing.
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