I just fitted my bike with a new handlebars, changed from straight to butterfly, but may have a problem.
I'm not sure if it is OK to leave my bike like this or should I get a longer stem (aheadset adapter with ahead stem or 22.2 classical stem like it is now?)
I just kept the existing stem when I added trekking bars and I was pretty happy with the set up. The straight part where the operational controls go (shifters and brake levers) was farther inbound than the original straight bar but the curved section which lets you stretch out was farther outbound. For me that was a good compromise. YMMV but if the original stem worked with a straight bar, I'd try out that stem.
I've done a 120km test ride today and the bike felt really good so I guess I will keep the setup. The original stem that came with the bike would require me to unwrap the handlebars and remove everything, and I don't think it is any longer, maybe a cm.
It was just that my first 1/2h ride seemed a bit unstable and weird but it seems I was just not used to this type of handlebars. And yes, as many people on this forum already stated, they beat the c*** out of straight bars for touring