Speedo drive thread size?

[Chadley]

Can anyone confirm the thread size of the speedo drive at the front hub end on a drum brake Italian GP? My crude measurement suggests it is M12 x 1.00. Is that correct?

[martyn dwane]

im sure it`s M14 x 1.5 pitch. i have a tap in my tool box that i bought to clean out the threads after i had my hub powder coated.i will check when its light.

[Chadley]

Thanks for the response Martyn. Sorry, I don't think I worded my original question properly. I'm looking for the thread size on the bush that the speedo connects to rather than the back plate itself. I have some burring on this and want to run a die nut over it to clean it up.

See here:

[Chadley]

Just in case it helps anyone else, it is indeed M12 x 1.00mm. A die nut of that size has cleaned it up nicely.