Anyone know what size tyre fits the Tenere with an 18"x2.5" rear?

Im looking at some Mefo tyres, there's a 150/70-18, but im thinking this might be too wide and rub on the swing arm.... Anyone out there know what fits, or what doesn't, when it comes to the width and profile for an 18" tyre?

https://www.adventuremoto.com.au/index.php?cPath=34_41

Cheers!

Tim.