Smoke the tri tip so it's medium rare or medium, too. It won't take a lot of time, and it doesn't need to be cooked to falling apart texture. That would cause it to dry out, and lose a lot of flavor.
Rating
Smoking Tri Tip How Long? by: Bill
It depends on the temperature of your smoker and the temperature of the tri tips when they go into the smoker. At a smoker temperature of 225 degrees, figure on from 1-1/2 to 2 hours.