Michelin North America Agricultural Tires says the CerexBib radial is the industry's first combine-specific radial engineered to deliver high-flexion capabilities while handling the cyclic loading and off-loading required from combines. Available by the axle, the front axle tires are designated as IF cyclic field operation, and the rear axle tires are designated as VF tires. Together, they bear up under the weight of increasingly large combines with 400- and 450-bushel bins, 16-row headers and front-axle weights of 50,000 pounds, and still help reduce soil compaction over traditional radials.