A really interesting post by
@DannyAG200 very recently:
"So spacers.. Josh was teaching me some very clever things about them and why they ruin the fro of the car.
A certain thing called scrub radius, with 20mm spacers you'd be towing out under braking and tow in accelerating, under breaking your car will want to squirm and will make your arb feel softer
This is why cupracers etc or track day drivers will leave the Clio with no spacers or just 5mm to keep it negative. Negative will do opposite, tow in on braking and tow out accelerating. Giving it a much nicer control under braking and controlling the torque steer ( if boosted mainly ) under acceleration..
I am new to knowing what it actually does but there's some great videos on YouTube about it! Worth a watch".