Stubs aren't standard. the relationship (angle) of drop arms and camber angle varies too.
There's 15mm diameter (old)
17mm, standard until relatively recently in kart terms.
And 25mm, now becoming very popular and resistant to bending when hammering kerbs.
The actual length of the stub axle varies too, meaning that you may have to add or remove maybe 10-15mm of spacers.
Always have two threads showing on the centre nut.
Three nut fixing for wheels is becoming the norm now.
Remember that wheels have different offsets, so changing what looks like identical wheels can result in the track increasing or decreasing.
The distance between the bearing centres also varies.
The offset also affects the stering geometry.
(Remember, what I say on here is probably wrong, there's only two pwople on here who are always right and neither of them is Itpro.
He's alive by the way, got an email from him today.
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