[XcSingler]

Where do I measure on a rim to find the "ERD"?
Also; how di i find the pitch circle diameter on a hub?

 

[Wombat]

You can measure your rims' ERD by following these instructions, although they are for trials wheels, so you have to adjust the spoke length upwards: http://www.trials-forum.co.uk/forum/index.php?showtopic=35813&hl=erd

If you register you see the pictures in the places they are meant to be rather than as attachments at the end.

Tim

 

[roger-m]

Where do I measure on a rim to find the "ERD"?
Also; how di i find the pitch circle diameter on a hub?

Take a look at this page, then click the button "Measure" for detailed instructions.

Always measure your own rims and never trust any figures given my the rim manufacturers.

--
Roger

 

[Speedub.Nate]

...never trust any figures given my the rim manufacturers.

I wouldn't go that far. Mavic has some well known ERD idiosyncrasies that kludges up their ERD measurements, but those are easily accounted for. Never had a problem with ERDs provided by Veclocity, Halo, Salsa, or Alex.

Not to suggest there is anything wrong (or difficult) with measuring yourself, but usually I'm in a position where I want to order the rims and spokes at the same time, not separately.