You're opening a can of worms here. If you're going to adjust the rear ride frequency you're going to want to adjust the front too. If you only adjust half of your suspension on the butt-comfort-calibrator you're bike's going to ride like garbage in the turns and probably buck your a** off if your hit a bump. You're going to want to invest in a fork cartridge kit with a higher spring rate too.
K-Tech technicians told me the OEM spring rates for the Gen5 are, "87N rear 11N front for 2016> ZX10R."
Consider this: if you're 215 lbs you've got probably 30lbs (20% more weight) on what they likely designed for). I imagine they base their suspension rates off an avg. 180lb rider if not lighter. So you're changing up the dynamic of your ride quite a bit.
When in doubt... send it!
Last edited by ddipaola; 06-26-2018 at 12:32 PM.