· Premium Member
I've been contemplating going to a progressive fork spring. Upon searching, it seems Progressive doesn't offer a spring for my '07 Spirit shaft drive, which leaves me with the Sonic Springs. According to their info, I need the .85kg/mm. Anyone here had any experience with these people and their product? Is the stock oil adequate or will I want to go heavier? Is the stock oil 7.5 or 10W?