The stock Road Glide handlebars are 1 inch in diameter. However, aftermarket bars are available in a variety of sizes to fit your riding style. If you're looking for a bigger or more comfortable grip, you can go up to 1.25 inches. And if you want a more aggressive look, you can go down to 7/8 inches. There are even bar ends available to give your Road Glide an even more unique look.