In large bowl, mix strawberries, rhubarb and lemon juice. In medium bowl, mix sugar, flour, tapioca, eggs, salt and cinnamon. Stir into fruit mixture; set aside 15 minutes.
Heat oven to 400°F. Place 1 pie crust in ungreased 9-inch glass pie plate. Press crust firmly against side and bottom. Spoon filling into crust-lined pie plate. Top with second crust. Wrap excess top crust under bottom crust edge, pressing edges together to seal; flute. Cut slits or shapes in several places in top crust.
Bake about 15 minutes or until crust is light golden brown. Place cookie sheet on oven rack below pie in case of spillover. Reduce oven temperature to 350°F. Bake 40 to 45 minutes longer or until golden brown.