One tiny note on David Nunn's excellent drawing: not all wheels have the outboard 'bump' for wheel weights or whatever on the extreme edge of the rim, so technically, the backspace should go from the flat part of the wheel to axle flange rather than including the bumps. Sure, all Campys have them, but aftermarkets, steel etc vary all over the map as to the heights of bumps or whether they're there at all. Thats also why some people get 4-3/16" for 8" Campy backspace while others get 4". Just a thought for consistency.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.