Firestone D663

Width

195 indicates the section width of a tyre in millimetres.

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Aspect Ratio

65 is a tyre’s aspect ratio which is its height from the base of the tread to the rim. This number represents a percentage of the tyre’s tread width.

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Tyre Construction

R means that the tyre has radial ply construction, meaning the way in which it has been constructed.

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Rim

15 indicates the diameter of the wheel rim.

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Load & Speed

91 V is a reference that indicates the maximum load capacity and speed at which a tyre can be safely operated... See load index table here.

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OD

Overall Diameter of the unloaded tyre in mm.

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Type Definition

• RFT Run Flat Technology
• RRFT Repairable Run Flat Technology
• MOE Mercedes Original Equipment Extended
• RBT Raised Black Letters Tubeless
• OWT Outline White Letters Tubeless
• RWT Raised White Letters Tubeless
• TL Tubeless
• TT Tube Type
• XL Extra Load