All bikes have same size head tube?

[sark]

Do all motorcycles have the same size gead tubes? I apologize if I''m using the wrong terminology. The bit im referring to is the part of the frame that the steerer tube of the forks passes through. Is this a standard size?

thanks

[skreemer]

they are not all the same.. though you may get lucky and find that they are the same for the same model through different years...

someone else may have the numbers for ya but I got this from working on a few different bikes(some of the exact same model just 1 year apart)

[sark]

Thanks for the info. I was hoping they were all the same and I copuld swap forks on a whim.

[Junkie]

Many bikes do, but certainly not all. There are lots of forks that will easily swap onto GSs though.