Hi,
I would like to install a 90 Deg. Grease fitting to the front arm, currently the grease fitting is pointing to the Brake disk and not allow to grease it,
Therefore I would like to change it to 90 Deg. type,
Can someone tell me what is the Grease fitting thread size?
Thanks,
Dan

just pop it off and take it to the hardware store, they usually have a sizer

I just replaced all of mine. They were 6mm.

Yes, 6mm

Great thanks 

We have them at Fastenal.