Medium = a spring which is harder than an usual touring car spring (i.e. a stock suspension Leon, a Highline Golf Mk4 or a Passat) but softer than an aftermarket spring or a dedicated race spring. Our LC / LFR springs are "medium" from this point of view. Exact code of springs can be found in ETKA by a parts
shop, but it would be an useless effort.
A race spring on a LC / LFR chassis would be shorter and a shorter spring has to be automatically harder, otherwise the car would roll even more.
A soft damper on a stiff spring = poor damping of the chassis' bounce, car squats, dives, rolls and "wallows"
A stiff damper on a stiff spring, like race dampers and
coilovers made for track = acceptable damping on good roads only, begins to rattle you to pieces on poor roads
A stiff damper on a medium spring would combine the roll stiffness given by the spring and also dampen the bounces of the bodywork upon ripples and bumps.
Koni has a Sport range which comes with springs and dampers tuned to fit each other
~Nautilus