I had a 91 1500A front fork spring were a bit weak. I took them apart and replaced them with progressive springs. Now i have a 98 forks seem to sag a bit I am going to replace the fluid to 15W and put progressive springs in it. My old Aspencade didnt have air assist. But I see that the 98 SE has it. I am wondering if anyone has run progressive springs with the air assist and what PSI they run? I looked it up in a OEM manual but I cant find anywhere it says.