if you use slick tires you need harder springs.
I believe i have 50kg springs front but that s for slicks on track to soft. For semi and good streettires it s enough. You could even go for 70kg front. But any harder is a no go for the road. I find 50kg springs already hard for road use.
I use my 1M car mostly for track now.
I found the eibach RS1 kit the best compromise. It was lovely for the street and hard enough for track.
The only thing i missed was hight adjustable that s why i went for race spring setup.
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