Two points:
First point: Vince Taylor's arms were measured (properly) at 19.5ish''... Vince was 220 at the time (if memory serves) and in contest shape. Remember a 19'' arm is 11% bigger than an 18'' arm, not just the 5.5% bigger the tape would seem to indicate (as an area it's dependent on the square of the measurement). Tim Fogarty can probably shed more light on this.
Second point: Your arms are NOT eighteen inches.
The Luke
Sorry, if my bf level rise to yours mines will be 19inchs.

And I was so deplated at that time of measuring too.
Nad You you are soooopathetic that you say " NOOOOOOOOOO, your arms measured 17.6-7 inchis."

What a sad loser you are..
And I know tons of 20inchs amas arms which looks waaaaaaaaaaaaay smaller than Vince arms.
You guys just dont know how big pros arms are. And Vinces arms are strong bodyparts of his body.