Everyone’s asking what’s wrong with SFN’s..?
It’s a pretty rare example, but a mate sheared his steerer through the nut when he cased a jump, and his stem broke off. Reason was a huge build up of corrosion around the nut, and the fact that he’d just cased a jump… hard enough to send the stanchions slightly banana shaped!
He’d used it for loads of winters getting around on the roads. Loads of commute bikes end up with very crusty SFNs. You see it when you replace a lot of headsets on them. I like Head Doctors for that reason.. Alu steerer, alu expander, no corrosion problem. No worries if it’s a steel steerer though.