Road bike recommendations

Would that boardman take 42mm tyres, without guards?

What do you think? Are 42mm tyres bang on 42mm wide, i.e. is the measurement outermost lug to outermost lug, or is it the carcass of the tyre, and lugs are additional?

Oh, and:

1. andyp
   
2. smallfurry
   
3. Gabe
   
4. andy.w
   
5. Howard
   
6. mdcc_tester
   
7. Dammit