It didn't sacrifice low speeds as much as I thought it would.
GIORNO CREA has a weak center spring, and shifting starts almost as soon as the car starts, so the weight roller was set 1g lighter than the attached one, and the 0.3mm boss shim was used to make the Belt drop deeper to slightly raise the Engine RPM at low speeds. The weight roller is 1g lighter than the supplied weight roller, and a 0.3mm boss shim is used to increase the engine rpm at low speeds. By doing this, I think I can solve the problem of low speed leaning that is often seen with high speed pulleys. I think that the best setting is to set the center spring a little harder and make the weight heavier, while slightly licking the weight roller surface of the pulley and shifting it a little to the high rpm side within the range not exceeding 8000 rpm.
View Detail

