I'm pretty sure the stock shock spring for an 08 yz450f is a 5.5. I need a stiffer spring. I weight 195lb in street clothes and around 220lb in all my gear. I have a des tank and other off road add ons that make the bike a bit heavier. When I've tried to to the Race Tech spring calcutator, is says the stock rate is 5.3. My other problem is race tech and factory connection offer a 5.6 rate and a 5.8 rate, which should I chose? I know also Eibach makes odd number springs( possibly a 5.7?). I am not sure of my current sag with all my gear on but in my street clothes a have 27mm of static sag and 111mm of race sag. Can anyone help on what spring to buy?