Is there a way to put 3 bolt aluminum racing wheels on my center nut cart? I can get a set of four for nothing, but they obviously will not be a direct hook up. Is there a conversion or would I have to change everything?
Some pics would definitely help us help you, but you might just need some race kart style wheel hubs. Take a look through the Wheel Hub link here: http://www.cometkartsales.com/store.htm
ps:
These types of rear hubs require a keyway machined into your live axle where the hubs mount.
You'll need to measure/confirm if your rims are Metric or American pattern. (measure the center to center hole spacing between any 2 lug holes and post your findings)
If you measure and post the diameter/length of your front spindles, I'll check around any 3-hole hubs that'd fit.
But... I've never ran across any parts for sale to install 3-hole race rims on a an open axle set up like yours. They're pretty much all made to clamp around a live axle and use a key and keyways to lock in place.