DO NOT use what racetech recommanded for your 08 zx10r.huge mistake on their website.http://old.racetech.com/evalving/menu/searchstreet.asp
enter your bike info and weight and it will tell you what springs you need.
the stock fork spring length is 235mm from what i measured,but racetech said it is 273mm.
the stock shock spring rate they said is 9.1KG/MM,and they recommanded 10.06 rate spring for my weight(110lbs),its totally wrong!! I get ttx36 with 8.0 rate spring now,I set the rider sag 25mm with the 15mm free sag now,it seems even 8.0kg/mm spring is still a little stiff for my weight.so i call 10.06kg/mm a BS for the 110lbs riders.