Upgrades to handlebars Singletracks Mountain Bike News, Reviews, MTB Trails and Community › Protected: Forums › Mountain Bike Forum › Upgrades to handlebars Tweet Add to Flipboard Magazine. Tagged: handlebar, Stem Viewing 1 reply thread Author Posts September 24, 2015 at 21:20 #174890 Logan Clemons i am looking to upgrade to a 35mm handlebar for my cannondale super v 800. What size stem do i need to get to fit with the stock super fatty shock? September 25, 2015 at 11:40 #174981 gar29 Your best bet is to measure the diameter of the bar where it goes into the stem and buy a new one the same size. Stems come in different sizes for different sized bars so it is impossible to tell otherwise. Author Posts Viewing 1 reply thread You must be logged in to reply to this topic.