Originally Posted by HillRider
These chamferd locknuts were used on early 8-speed hubs so they would go into the (then) common 126 mm frames with minimal difficulty. By now manufacturers assume 130 mm hubs are going into 130 mm frames and the locknuts aren't chamfered.
They still have slight chamfers (like any nut) on them IIRC. Either way, getting the wider hub in place was very easy, although I didn't try it with numb fingers.