Singlespeed & Fixed Gear - stem and handlebars question

Quick question: On JensonUSA stems are described by length, + or - degree and clamp size. I'm looking for a 1" stem so I would get a 25.4 clamp size correct? Then what would be the clamp size for the handlebar? Would any standard MTB handlebar work?

Thanks

You have to consider the steerer diameter as well as clamp diameter.
25.4 describes handlebar clamp
1" or 1 1/8" would describe steerer tube

Some bars have a 26.0 or even 31.8 clamp area.

Stems have a number of important dimensions.
1. The diameter of the steerer tube.
2. The diameter of the handlebar where it is clamped by the stem.
3. The reach (how far from the steerer to the bars).
4. The rise or the angle it makes with the centerline of the steerer tube.
Almost any quill stem (for threaded steerer) out there now-days is for a 1" steerer.
Most stems for threadless steerers are 1 1/8". Some come with shims for 1" threadless steerers.
Most MTB bars are either 25.4mm or 31.8mm clamp diameter.
Most road bars are either 26.0mm or 31.8mm clamp diameter, but there are exceptions.

Thanks for the replies guys. I have a 1" steerer so if I wanted a riser MTB handlebar then I should get a 1 1/8" stem with a shim with the appropriate clamp size for the handlebar. So clamp size on stems refers to the clamp that secures the handlebar.

You should get a 1" to fit your steerer and then match up the handlebar clamp area to the clamp diameter of the stem. There are shims available to make bars fit in stems.

Edit-I think you got the idea, shim for your steerer is correct.