I'm considering changing the drop handlebars on my PFN-10 to bullhorns. I don't want to get into changing the stem (it is and ATAX stem). The drops have engraved "Philippe Guidons" and "Franco d'Italia" on either side of the stem clamp. From what I can find, the handlebars have a 25.4mm diameter at the clamp and the stem accepts only this side. Is this right?