The GF has stiffer spring rates compared to the NF (in the ZRE case, just stiffer up front): Sustec Pro GF (GGZE151HK): [F] - -14~-52mm, 5kg [R] - -14~-63mm, 4kg Sustec Pro NF (NNZE151HK): [F] - -17~-55mm, 4kg [R] - -14~-63mm, 4kg Tanabe label their suspension products like so (softest to stiffest): NF - "Normal Feeling" - Mild drop/Soft/Street DF - "Dress-up Form" - Max dumpage/Soft/Street GF - "Grip Feeling" - Mild drop/Medium-hard/Street-Sports @Kevin, yeah man for sure.