Random thoughts:
You don't "gain" 5W. What it means is it would take 5W less power to maintain the same speed.
But assuming you ride to effort not speed, the actual effect is that for your 150W input, you'll go slightly faster (because less power is being wasted in RR, and hence more is being used to propel you)
As above, yes it's 5W per tyre.
I'm unclear in BRR's test whether the test includes a driving torque. e.g. as you described with tread wear, it's not just due to the vertical load on the wheel, the rear gets much more torsional load to propel you forwards which causes the friction and wear, the front wheel just passively rolls. And second to that, I'm unclear how driving torque is related to rolling resistance.
You can measure the effect of weight load on the tyre by just adding more weight on the rolling resistance test rig. I have a feeling BRR has done this, but at a guess it would be linearly proportional.
You don't "gain" 5W. What it means is it would take 5W less power to maintain the same speed.
But assuming you ride to effort not speed, the actual effect is that for your 150W input, you'll go slightly faster (because less power is being wasted in RR, and hence more is being used to propel you)
As above, yes it's 5W per tyre.
I'm unclear in BRR's test whether the test includes a driving torque. e.g. as you described with tread wear, it's not just due to the vertical load on the wheel, the rear gets much more torsional load to propel you forwards which causes the friction and wear, the front wheel just passively rolls. And second to that, I'm unclear how driving torque is related to rolling resistance.
You can measure the effect of weight load on the tyre by just adding more weight on the rolling resistance test rig. I have a feeling BRR has done this, but at a guess it would be linearly proportional.