I have a CK30 gear and have found that by using the low or high range I can get the exact speed for every thing I do. If I am out in the open it is high range but when I am on a steep hill or in in thick woods it is low. with 8 total speeds just about any speed can be obtained and is constant. The shuttle shift makes things that much better. I would think the CK20 would work the same as mine.