I think he means it's not a -17°. Which is true slammage.
it's not a -17°
It's not -20° either, which would make it more or less parallel with the top tube. slamthatstem.com don't agree with your definition, they certified this Cannondale only a week ago
I was working off "parallel to the ground" assuming 73° headtube angle.
That website is bizarre anyway. Some of them definitely belong in here:
Who needs a spine anyway?
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I think he means it's not a -17°. Which is true slammage.