Are you cuttin' yer own spacer? If so, do not forget to bevel both edges............that is how mine is..........and yes, I did use a good gage.
No,Im not making my own. The wheel spacers popped off my OEM wheels as they were sitting alongside about a half dozen of various GSXR wheel sets,so I tossed them in a bin that I keep wheel spacers in as I had no immediate plans on using them anytime soon..anyway's Im now using a Gen2 wheel on my Gen1 and trying to determine which spacers are correct as they are all pretty close in size.