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Note the rates of this black rubber that was cut in half leaving only two of the original four rings. This looks fairly normal when compared to the other graphs here, but note the distances of travel. They are in 100ths of an inch and only go to 0.500 inch. The other graphs go to 1.50 and 1.75 inches. This half rubber yields a rate of 420 pounds/inch at only 0.5 inch of travel. That's one stiff bump rubber. Because of the short amount of overall shock travel, this one is used on a Grand-Am Daytona Prototype.