threadless stem and handlebar compatability

Hi all, sorry if this is a newb question, or one that has been asked before (I did search, promise!)

On a modern threadless stem with a 4 bolt face plate (sorry if my terminology is inaccurate) it seems my stem could accommodate smaller and potentially larger handlebar sizes.
This is on a 2014 fuji track 2.1 which has a 26.0 handlebar at the moment.
I would like to use bull horns, but keep the drops for the track (so no chop n flop)
Will the stem safely take a 25.4 handlebar? (Charge slice)
Are these modern stems able to accept a variety of sizes? It looks like it should be fine with a good 1or 2mm play.

Sorry if this is obvious, but have only used quills before, and never changed handlebars!

Ps opinions of the charge slice bars? I'm not part of the hipster crew but they look cheap and cheerful!

Thanks, Gretsch

Shimmy

ditto^

yup I saw shims.

So I guess modern stems are size specific then?

would rather just get the right size handlebars than mess with shims though...

There not many really. 25.4, 26, 31.8mm and maybe others that are weirdo French and alienese. As far as the majority of people are concerned. It's those 3.

I personally run 25.4 but that can be a pain once you start getting into drop bars (Road stuff) but for track, Nitto do all forms of nice stuff that's in 25.4. For a premium.

I've often found in practice that you can put 26.0 bars on a 25.4 stem and vice versa without too much problem. It varies from brand to brand so it is is worth trying with what you've got before shelling out for new kit.

I've often found in practice that you can put 26.0 bars on a 25.4 stem and vice versa without too much problem. It varies from brand to brand so it is is worth trying with what you've got before shelling out for new kit.

You ever have a stem fail on you?

I wouldn't worry about shims tho, I've had a nitto one for ages and its completely fine. they may cost quite a lot considering how tiny they are, but saves you buying different bars or stem.

You ever have a stem fail on you?

No.