Originally Posted by FBinNY

I HATE ******* ZOMBIES!!!

So, re. the Raleigh.

It's reliably 7/8" (22.2,mm)

This is so reliable that you could use it to check the accuracy of your calipers. The fork is 1"OD with a 1/16" wall thickness, so also 7/8".

If you come up with anything else, either your caliper is off, you're not using it correctly, or your bike has non original parts.