What is the diameter of your handlebars? Oli Cowl April 12, 2022 13:25 Updated The Prolog and Dutch model handlebars have a diameter of 22.4mm. Related articles Downloading the app and pairing to your bicycle I want to mount my phone on the stem of the bike, how can I do that? How can I transport my child/kid on your bike? What lubricant do you use on the chain?