Hi stu motor wise its whatever you want I use a 6.5 which is a bit much for indoors 8.5 seems to be a good all round choice for 2wd and anywhere between a 5.5 and a 7.5 for 4wd. tires for 2wd schumacher yellows minipins on the rear and schumacher staggers on the front and 4wd is usually schumacher yellow minipins all round.
hope this helps
James
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