I assume you mean cannondale fatty forks as Onza fatty forks don't exist. Cranks, could concider Middleburns unless you want to run front freewheel, in which case You should concider Echo cranks and a tensile Freewheel, or if you have the money an Eno. Wheels, well trialtech rims are probably your best bet and hubs depend on your price range, If your rich get a King if your not rich get a fixed hub. Go single speed, it gets rid of the whole mech problems.