On the front hub there are spacers which are normally 10mm wide, when I say out that’s what I mean. If its 20mm out put 2 spacers between the hub & the wheel, the rest go on the outside to hold the wheel stable. When you tighten the wheel on you should JUST be able to turn these with your fingers. On the big aluminium boss the holds the front hub on there are marks & numbers these are the degrees of castor, 15 & 20 are numbered. On the chassis where this bolts on you will find a centre mark, this is the mark you use to set up the castor. At the rear the measurements are taken from the bearing holder face nearest the wheel to the face on the wheel hub that the wheel seats onto (take the wheel off to do this), all measurements are in mm. If you get to your local track some one will help you with the basics
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