This is the same for all bikes? I would think each bike would have their own numbers due to design differences?
The THRUST angle number is pretty consistant as this angle defines
the ANGLE OF THRUST from the swingarm against the contact patch.
Think of pushing a broom..... there is an angle at which it feels right.
too steep is hard to push. too shallow and there isn't enough weight
on the broom to do the job..... this is EXACTLY the same dealy-o.
If the swingarm is flat - low swingarm angle - squat is excessive and
thrust is straight back on the hub, this doesn't push the tire DOWN
to the tarmac.....just back.
If the swingarm is steep - high swingarm angle the thrust is pushing
DOWN on the hub rather than BACK on the hub and wheelspin is the
usual result.....bike lifts, wheel spins without that bothersome forward