what’s the order of stiffness for these 3 front bar setup on an OTK chassis?
standard bar flat
standard bar 45deg (is this even a valid option?)
silver round bar
In that order.
Flat > 45deg > Chrome > Up > Silver > Gold
I was always told the order of stiffness for OTK from softest to hardest was:
flat bar < chrome bar < grey bar < gold bar < upright bar
You can twist the flat bar various degrees and in theory achieve the same stiffness of the round bars. I’ve seen some people mark their setups so they have their adjustments laid out, but I find it easier and more consistent to just put in the round bars when needed.
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I’ve read the same, but the section properties don’t tell the same story. 
I’ve never blind tested them back-to-back.
The oval bar is 30x15x1.5, so can’t be stiffer than the grey bar that is 30diax1.5
It’s quite close to the chrome 1.0 wall.