Dunlop presents the custom tyre D251: Original equipment specific for Yamaha XV 1900 (2006+)
Road holding, braking, comfort... The choice of a motorcycle tyre impacts many aspects of your machine's behaviour, both on the road and on the track or off-road. It is therefore essential to carefully select the model that best suits your needs.
To help you understand better, here are some explanations that will assist you in deciphering the information found on motorcycle tyres:

• Dimensions: width of the tyre in millimetres and height of the tyre as a percentage of that width. E.g. 190/55, for 190 mm wide and 55% high
• Structure: radial (ZR, or R) or diagonal (B), both tyres must be identical in this regard
• Diameter: expressed in inches, e.g. 17 or 19
• Load index: maximum load that the tyre can support
• Speed index: maximum speed that the tyre can support
• M/C indicator: purpose of the tyre, M/C for motorcycles
• With or without inner tube: TL ("tubeless") for tyre without inner tube, TT ("tubetype") with inner tube

In some specific cases, other mentions may appear, usually associated with the commercial name of the tyre. Here are a few:

• A: Kawasaki
• C, F or GT: BMW specification
• E or B: Special carcass for heavy or loaded motorcycles
• G: Specification for Honda, Suzuki, Yamaha
• GTW: Heavy, fast and powerful Grand Touring motorcycles
• H: Original Honda specification
• K: Very fast motorcycles
• M: Original equipment for Suzuki
• N: For Aprilia, Honda, Ducati, Kawasaki, Suzuki, Yamaha, Triumph
• RF: Reinforced tyre
• WW: White-walled tyre

Other less significant references are also found on the sidewalls of motorcycle tyres (country of manufacture, DOT marking, etc.)
Don't forget to regularly check your tyre pressure, as it ensures longevity and superior performance!