In 1913, Mercedes updated their mid-range 7.2-liter cars to have 60 HP at 1300rpm. These were the largest cars to use a drive shaft system as the 9.0-liter flagship models were all chain-driven.
The 28/60 PS was included with the “cardan cars” that were named in honor of Gerolamo Cardano’s theories and the universal joint which made the drive shaft possible.
Also known as the 60HP, the 28/60 PS was a mid-range Mercedes that was only one step below the flagship 9.0-liter, 6-cylinder cars. Many were used by dignitaries and the model was regarded with high esteem after Mercedes won the French Grand Prix.
Some 7.2-liter cars were ordered on occasion with with chain-drive if the car was going to subject to rougher roads.