Valbrona wrote:I want four chainrings.
I've got 4 chainrings with my setup, Schlumpf HSD with twin chainrings .
38-55 and 95-137.5......
It's not big chainrings that are useful, it's small ones.
So it's possible to bolt an adapter to the inside of a triple.
But to go much above 24t difference at the front, you need to start modding the derailleur cage.
That trick was done whan max sprocket size was only around 28t.