1928 Excelsior Super X Big Bertha Hill Climber
Inventory Number: 5013
In remarkable original condition!
cylinders, developed by the legendary Arthur Lemon, could be tuned for more power without over-heating.
A pair of “M” cylinders on the Super X crankcase gave the 61 cubic inch V twin a major
horsepower boost. This modification was nicknamed “Big Bertha”.
Extremely rare because very
few of these factory-built racers were ever produced. William V. Altman was part of the Joe Petrali team
who won more than 31 consecutive hill climb competitions in 1928 and 1929.