Mine is a Euro model but I expect they are the same except for the display plate. I measure mine as M18 x 1.5. With a caliper, it actually measures as 17.63 mm Major diameter of the speedo thread. The pitch is precisely 1.5 mm.
Since 17 mm x 1.5 mm is not a standard size metric thread, I suspect it`s really an 18 mm x 1.5 .
Can anyone else verify?
Tom Kizer
