Aluminum wheel rims to warm-up the tyres even more, perhaps on wet tracks. Magnesium wheel rims to keep tyre temperature and pressure more stable and uniform. This, in a nutshell, is the reasoning behind the choice of kart wheel rims. However, in truth, there are big differences even among magnesium wheel rims. AMV (Aluminio Magnesio Veneto), a company specialising in the production of wheel rims, hubs, gearwheel supports and brake systems for karting, which has just launched two types of extremely interesting 100% magnesium wheel rims , knows this all too well.