@Cajer asked this elsewhere so I figured bring it here
slowman once posted this : “over the winter the UAE team stuck the pill-shaped suppositories up their asses and over repeated rides found that they could save significant olivia newton johns through the use of wider tires”.
So we needed a unit called a ONJ (Olivia Newton John). For the geeks it’s just the standard deviation of Z axis. We have several IMUs this is just one.
Here are 9 runs. The first three are done on a good road at 5bar.
Then I go over to a really bad section and do 3 runs at 5 bar, 4.5 and 4.0.
Then I repeat that (5, 4.5, 4.0)
I should not be using CDA for these bars, I should probably use CRR watts, but anyways, smaller is faster. We see the bars shrink as pressure drops
What about ONJ ? Here I overlay the ONJ data
Obviously more bumpy
If I average the ONJs over the out and backs, they you see the pink lines
The Back is higher than the out because the roads are rougher. We see the ONJs going down with pressure, although there is a certain amount of I don’t ride the exact line every test.
There is far better data than ONJs but plots in the frequency domain do not give you the same “what did that suppository feel like”
