I first used an aluminum mtn bike frame(ridden hard previously) with a rigid steel fork. It felt wiggly under load. Eventually the bottom bracket weld broke. I replaced it with a Surly 1x1 steel frame with a Rohloff hub and 26x1.5 road tires. I originally just wanted a smoother ride but was pleased with how it lowered the standover height so it is easier to balance at traffic stops. The steering is fine, I love my truck. It weighed 45 pounds at the bike shop.