Been discussed in length at other threads, but there is no mechanism I can see for zip-tieing to do anything other than keep a loose spoke from flopping around and doing damage if it breaks or loosens to the point where the nipple goes AWOL. Spokes are only in tension and whether they are tied at their center makes no difference in how they are loaded.
I doubt how tight you tie them together matters much although it is remotely possible that tieing them very tightly might cause a stress riser at the point of contact as they flex. But I doubt even that is very likely - if a spoke breaks, it is almost always at the ends, especially they make a sharp bend. (One reason competing spokeless wheel designs are often stronger is that many of these systems have straight spokes without bends.)
- Mark
I doubt how tight you tie them together matters much although it is remotely possible that tieing them very tightly might cause a stress riser at the point of contact as they flex. But I doubt even that is very likely - if a spoke breaks, it is almost always at the ends, especially they make a sharp bend. (One reason competing spokeless wheel designs are often stronger is that many of these systems have straight spokes without bends.)
- Mark