Race Winning Components. The Renthal Apex 35 combines All Mountain strength, Enduro stiffness and XC lightweight. Unique 240deg handlebar clamps allow much of the stem body material to be removed, whilst retaining the strength and stiffness demanded by modern, wide handlebars. The Apex 35 is fully CNC machined, featuring an oversize centre bore, extensive machining and external webbing to maximise structural strength and stiffness and minimise weight.