most guys run a 15x14x5 weld wheel i run a 15x12x3 keizer wheel.the back spacing will depend on how much room you have to run and your shock location.as far es a 10in rim goes you can get a v tread on them but you loose alot of the tread width on the ground,i would say you would have to special order that in a beadlock from weld.when i tried to find 12in wide no one had them and weld said 8 weeks before they change thier production over to make them,but that was at the start of race season so you might find something now.they have just about any size you want in stock with the keizer wheel. outlawracing.com i think thats the web site i got mine may have to double check that.chad.