Quote:
Originally Posted by Majormallock
Thought I replied to this, sorry if repeat. I understand front caster, it is the rear that gets me the spec sheet say 1.25 degrees rear pointing caster
Like to know why? Cheers Phil
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All good. Sorry I didn’t make it clearer. The issue is trying to avoid a situation where you get toe out on the rear.
Think rear steering dumper truck. You want to avoid this.
When the rear wheel toes (steers) out it is very uncomfortable for the driver. In a straight line and corner tbh.
The caster on the rear gives the wheel some stability in toe. It does this by using the caster offset
In addition, when you brake, the lower wishbone moves back and the top forward, this reduces the caster and caster offset. Therefore if you start at zero caster, when you brake you’ll get negative caster, negative caster offset. This will make the rear wheel very unstable in toe. Like the shopping trolley wheel wanting to swap direction.
In summary it’s about making sure the rear wheel toe is controlled and stable under all circumstances.
Does that help a bit?
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