Campagnolo gran sport dating sx66 updating
When Herse began to offer complete bicycles in 1940, his cranks were available only on his bikes.
If you wanted a René Herse crank, you had to buy a René Herse bike.
When Campagnolo offered his first cranks in 1958 (above, 1965 version shown), Campagnolo used five arms for the spider instead of Herse’s three arms.
Perhaps he thought that racers needed more support for the chainrings?
This precluded a more widespread adoption of this great design.
Starting in the late 1940s, Tullio Campagnolo adopted a number of cyclotouring components for racing.
In the 1970s, Campagnolo began offering a factory-made version of this design.
The Campagnolo triple appears to have been the first production crank with two different bolt-circle diameters.
(Campagnolo famously bought two Nivex derailleurs from Alex Singer the year before he introduced the Gran Sport.
You can read article on the development of the Gran Sport here.) The Gran Sport was so successful that it set the mold for all modern derailleurs.
Even Shimano’s electronic Di2 rear derailleur can trace its ancestry directly to the Gran Sport.
For decades, most component makers copied Campagnolo, sometimes with small modifications.
Shimano’s cranks used a 130 mm bolt-circle diameter that allowed using chainrings down to 38 teeth.