Quote Originally Posted by scottwv View Post
You may have misread the codes ?? The spring rate should be determined by how heavy your bike is...I have 525 lb on the rear of mine.
You've really got me thinking on this one. I've pondered your question for a while. I did some research and found some information on the RZR site.
My Elka springs have the following codes printed on them:
Front R4.2X300
Rear B4.9X356

4.9 and 4.2 are kilograms per millimeter.
1kg = 2.2 lbs, 1mm equals .0395 inches or 1inch = 25.4mm.

4.2 x2.2 =9.24 lbs x 25.4 mm= 234lbs/inch spring rate for the front.
4.9 x2.2 = 10.78lbs x 25.4mm = 274lbs/inch spring rate for the rear.

The last numbers printed on the spring, 300 and 356, should be the length of the spring in millimeters.

I could be completely wrong on this data, but the numbers seem to make sense. The stock Ranger 900 XP has a 200lb front springs and 240lb rear springs.