Cut the lime in half around the middle, widthwise. Save one half for later use (or for juicing for your lime juice). Cut two thin round slices from the other half, then cut what's left into quarters.
Pour salt onto a plate. Wipe one of the lime wedges around the outer edge of two glasses, then roll the outer edge of the glass in the salt. Fill each glass with ice.
In a cocktail shaker filled with ice, combine tequila, simple syrup and lime juice. Shake to combine. Divide into the two glasses.
Top each glass with 6 ounces of beer.
Garnish with a lime wheel.
Notes
For a frozen version, combine 2 cups ice with tequila, simple syrup, lime juice and beer into a blender. Blend, and pour into salt-rimmed glasses. Enjoy!