Alloy rims will heat up a lot quicker because they hold a lot more air than mag. So in theory alloy should be the choice to have come winter low track temperatures etc....... . What mag rims do you have? when i ran a v4 i used douglas rims just the ordinary not low volume type and they were great:} kart always handled well, but biggest improvement i ever found was seat tillet t11vg worth every penny. I would of ran the kart 10mm spacer at the front with intrepid l90 hubs and 10mm in from the end of the axle with short hubs on rear with a jkh medium compound axle. Hope this helps also check this link out http://www.ekmpowershop5.com/ekmps/shops/paulcarrracin/wheels-72-c.asp if your looking for alloy rims these are good ryan cole, adam constable, and all the quick tkm boys used them.
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