FS racingart . cars : HPI baja 1/5 wheels and tyres slot straight onto these cars ,,,,24mm Hex. Much better than FS have on offer. Recommend " FS 4wd conversion kit " with " Madmax Big Digger tyres 170 x 80" on Baja rear wheels front and back ,for good fun off roading. RCmodelz.co.uk have what you need.