If it’s the handlebar clamp, then you need to be sure your seatpost is 25.4mm. If it’s the steerer, then either 25.4 or 28.6mm (I dunno, maybe you could shim a 27.2mm post like on the KH into the bigger size)
Although if your seat post is 22.2mm you can use a bar end on the seat post and weld an extension handlebar to this. I ran this setup for a couple of years before cutting it down to hold my bar end lever (as a brake lever), like Joe I’ve stopped using handlebars.
Kington99: Because it’d then make my handlebar crooked. I’ve thought of making a U-shaped bar extending from the stem but I think it’d be too wide at its minimum and my legs will be rubbed raw… any suggestions mod it any other way?
Joe: I’m using the clamp that would usually go on a bike’s headset (no idea what it’s called). I’ve no idea how wide stems are - I guess I’ll have to ask.
Keith: How do I do that? I’m going for welding an extension to a stem because it’s hollow and the overlapped part would be stronger (am I right?). Also, the clamp portion looks more likely to hold. If a bar end holds just as well, I’m keen too. Do you have a pic?
oh ok, you’re saying if it was bent to have a nice straight section to go through the stem it would be too wide overall. If you cut and welded the bars instead you could achieve this though. The stem and handle bars are likely to be different materials, making welding impossible.