Stir together the salt and lime zest in a small saucer. Rub the cut side of a lime half over the rim of 2 pint glasses. Dip the rims in the lime salt to coat.
Fill the glasses two-thirds full with ice. Squeeze the halved limes over the ice and drop the rinds into the glasses. Divide the tomato juice, chipotle peppers and lager between the glasses. Stir the mixture and serve immediately. Add football-carved limes for garnish if using.