I needed a sub compact to ride the hills around Pittsburgh so I changed to a sub- compact by purchasing the 46/32 Chain rings from Absolute Black. They are an easy fit with the Shimano 8000 groupset and it takes a few minutes to make the switch. This switch has given me the lower gears needed to ride some of these steep hills and to get into a comfortable cadence on the long ones. The other alternative is to buy a rear cassette the size of a dinner plate.