daveanscombe,
If it's a rear rim (19"), no matter what the width is, the rear tryall tire (19 x 2.5) will fit. The bars, they made some narrower 27" ones with the old style ones, some replica things. Get the new style Tryall bars, the shot peened anodized ones, they seem to be much better than the previous tryall bars. Full width is great, lets you balance well and control the bike nicely. If you're into narrower bars, cut them down. I would just leave them the full width though.