At least three major tire manufacturers are raising prices.

According to a press release, Goodyear Tire & Rubber Co.’s truck tires went up by as much as 5 percent on April 1.

Similarly, Bridgestone Firestone truck tires will go up by as much as 5 percent on May 1. Yokohama truck tires will also increase by between 3 percent and 5 percent on May 1.

All three companies said increases in raw material costs are forcing them to raise prices.

For truckers, tires are the second-highest expense for truckers, behind fuel.