Thanks Mike. I've actually got plenty of them. But doing it for the first time I want to know how to do it the long way.

Thanks for replying

RD

Quite right Mike. But in the link it says the spoke centre is a different thing from the rim centre. I dont see how that's possible.

RD

Ah OK, the rim centre is always the actual centre point as measured IE: halfway.  The Spoke centre is an average, IE: 2/3rds of the way across one spoke hole and the opposite on the next spoke hole, it shows it in the pic.

Ok now that's where I'm most confused - that diagram. What does it represent for a start. The left hand side of it with the spoke holes I'm seeing as the rim. The right hand blank side I dont get.

 Also wherever the spoke holes are in relation to the rim centre so long as they are equal distances from it then the spoke centre must be in the same place as the rim centre???

 ie: where 'O' is a spoke hole

 O

         I        

                O

Therefore Spoke centre - 'I'

And if the 'O's were on the 'rim' edge then the rim centre is in the same place. Correct???

 Apologies if I'm being thick.

That pic is of a rear rim, like this Easton one.

http://www.eastonbike.com/PRODUCTS/TECHNOLOGY/tech_gen3.html

My Campag wheel (rear) is slightly off set but the Easton ones are crazy.

Ahhhhhhhh. Cheers Mike

Weird rim though.