Steering head bolt size

[Grumpy Goat]

I am not aware that the steering head bearings come loose on the RS any more than normal. Checking for looseness should be a normal maintenance check item. Last time I checked mine was not loose and I have just over 60k miles on the bike.

As for the bolt you are asking about - not sure what you are referring to. In cases like this it is a good idea to check the parts fiche. Is the part you are looking for in this diagram?