Public employees love coffee, but they couldn't find a bike coffee cup holder on the market that mounted securely enough for their liking. So they designed a bicycle handlebar coffee carrier with a sturdy mount design that you can trust to carry even the fanciest single-origin brew. It's named after Trieste, Italy, the most important coffee port in the Mediterranean and the namesake of San Francisco's famous Caffe Trieste, the North Beach cafe that introduced espresso to the West Coast and the legendary hangout of bohemians from Kerouac to Coppola. The Trieste Coffee Cup Holder from PUBLIC fits all PUBLIC bikes, and many other city bikes. It's designed to hold a reusable coffee cup with a tapered body and a sealed lid, which is required to avoid splashes. The cup holder ring is lined with a soft grip material to keep your mug snug. SPECS: Designed to fit PUBLIC bikes Clamp diameter: 22.2mm Only for use with 12-16 z cups with sealed lids If you don't have a PUBLIC bike, measure your bike handlebars with a caliper at the spot where you want to mount the cup holder, to make sure the handlebar diameter is 22.2mm at that point. (Handlebars taper from the center to the ends.)