Especially developed for big custom motorcycles, this radial tire gives all the best of radial technology for your bike. With the D251, top-level customs now have the right tire to deliver the highest performance in terms of handling, riding comfort, and speed capability. The letter and number code shows the tire type as displayed on the sidewall of the tire. OE tires are designed to suit the horsepower and handling characteristics of the model for which each tire was designed.