SMF - Just Installed!
One arm, how strong do you need a bicycle to be? Thorns are all designed with efficient use of materials and no heavier than they need to be in order to safely and reliably carry their maximum rated loads with a bit of comfort, joy and durability thrown in. (I'd guess the strength/weight relationship of various Thorn frames is fairly linear). I'd ignore the frame weight and choose purely in terms of planned use. You will then get a bike as heavy as it needs to be and no more.You'll ride the bike not the numbersIan