It seems like I always run into these type of technicalities.

So I have a 5 SBP (1/2" bolts =small?).
When I measure the lugs center to center they are about 3 13/16 " +
Is this the nominal measurement for a 4 inch pattern?
Or does 4 inch represent the overall diameter measurement as opposed to the cross measurement distance to the bolts?

Doofus here from planet Boltulon.

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<img src="http://farm4.static.flickr.com/3173/2992308402_5481afb26e_t.jpg">

A 4" diameter circle will have the center of each bolt on it.

The approx. measurement between 2 bolts is about 4" center to outside when you have 5 bolts.

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes