Cheers for the responses everyone, I might give the no tubes a go then. I had thought maybe I could get away with something lighter (eg a crest) but it was mainly just me being conservative, the flows are the same weight (or less) than the 717s and thought through some illogical reasoning that must imply some equivalent strength. Then again maybe I could do with something beefier if I’m not taking a weight penalty over my current setup.
It’s the wheel pro guide i have and I’m fine with my current wheels for the time being, it was going to be a project over Christmas for when I got fed up with crap TV so intend to take my time with it.
Now just got to decide whether I’m going flow, arch or crest I guess. oh and spokes, I run super comps at the moment but maybe if i’m saving all this weight at the rim I should save money and go with comps, they’re a damn sight easier to get hold of!