[jacquesm]

There is a big difference between 'not overtensioned' vs 'slack'. Obviously the latter is going to get you in trouble. But simply don't overdo it, err on the side of caution and don't try to go for maximum tension before things break unless you really know what you are doing. Because they will break if you are not 100% certain that you are still under the limit.

I think the big difference between your use case and mine is simply that I don't have the luxury of rebuilding my wheels every three weeks but they have to last for years. I'm sure that if you treat them as disposables that you can get much closer to the limit, but the bike shop where I worked built ordinary bikes for ordinary people, and then long term reliability is far more important than to squeeze the last little bit of stiffness out of a wheel, though I can see that even in that case there might be some gain from being able to do that.

Keep in mind that this was - and in many places still is - a pretty low tech affair and broken spokes on a bike through normal use on a properly maintained bike in principle should not happen. Usually that indicates that either something got abused, badly mounted or left without maintenance for too long.

[wiredfool]

Unless the spokes go slack, the tension does not affect the stiffness of the wheel. Properly functioning wheels operate in the linear elastic region.

Higher tension is related to higher ultimate load capacity and better fatigue resistance.

[jacquesm]

> Unless the spokes go slack, the tension does not affect the stiffness of the wheel.

Sure, but when they go slack you've lost the plot somewhere along the line. That should - in principle - never happen.

> Properly functioning wheels operate in the linear elastic region.

Yes, more simply put: they are non-deforming springs.

> Higher tension is related to higher ultimate load capacity and better fatigue resistance.

Up to a point!