While preparing my hybrid bike for an extended tour I would like to replace its straight handlebar with something else which would allow more holding positions. I came across some good handlebars but the sizes confuse me. The diameter of the handlebar I want to buy is 25.5 mm. BUT: I cannot find any suitable stem—most of them list the clamp diameter as 26 mm. I never saw a stem with 25.5 diameter. THE QUESTION IS: Can I install the handlebar with 25.5 diameter on the stem with 26mm clamp diameter?
25.5mm sounds odd, as older road stems/bars usually came in 25.4mm or 26.0mm, with the odd 25.8mm bar that was 'supposed' to fit either size stem. There are some threadless stems out there that fit 25.4mm, I might even have one. In quill stems, the older Japanese models were often 25.4, eg. Nitto often came this diameter. If this bar won't clamp tightly, you could always make a shim from a coke can.