Quote:
Originally Posted by stegger
The 25° caster blocks are recommended in most cases.
• Use 30° of caster (optional #9593 caster blocks) if you need
increased steering entering corners and less steering exiting corners. It
will also be more stable when accelerating through fast bumpy track
conditions.
• Use 25° of caster (#9580 caster blocks) if you need less
amount of steering entering corners than the 30° blocks, but more
steering in the middle and exiting corners.
• Use 20° of caster (optional #9592 caster blocks) if you need even less steering entering corners and more steering exiting corners. All out of my head 
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lol, you fibber, that's straight out of the b4 setup guide