Brough Superior SS 100

Did you know that the world record for a motorcycle sold at auction is $551,000? It was set in 2008 by a 1915 Cyclone board track racer. But that record might be broken on 15 December, when George Brough’s prototype Brough Superior SS 100 goes under the hammer in New York. This machine is the evocatively-named Alpine Grand Sport variant, and it’s tipped to go for between $600,000 and $700,000 — via Bike EXIF