Brand and Pattern
All tyres feature the brand and pattern description on the
sidewall. In this instance the brand is Bob Jane and the pattern is
Width: Tyre measured in millimetres from the
two widest points.
Profile: The aspect ratio of the tyre, which is
the height of the sidewall as a percentage of the width.
Wheel size: Diameter of the wheel rim that the
tyre is designed to fit, measured in inches
Directional tyres have been designed specifically to operate
best when rotating in one direction. The tyre pattern is usually in
the shape of an arrow with grooves running from the centre rib
(middle) of the tyre to the outer shoulders. First engineered for
racing in wet conditions, directional road tyres have excellent wet
weather performance, due to their ability to displace large amounts
of water from the road surface, while providing directional
If you have a pair of directional tyres on your vehicle, they
will usually have either an arrow or similar symbol indicating the
direction they are designed to operate.
Speed Rating, Tyre Load & Pressure
Load Index: The load index is a numerical code
associated with the maximum load a tyre can carry when inflated to
operating pressure. Click
here to view the load & speed rating table for full
Pressure: Nearly all manufacturers print a
maximum inflation pressure on the sidewall the tyre. It is
important to note that this is generally not the recommended
operating pressure for that tyre. If you are unsure of the correct
inflation pressure for your tyres or the pressure description is
missing, simply enquire at your local T-Mart or reference the tyre
placard on your vehicle.
Speed Category Symbol: This indicates the maximum
safe operating speed for the tyre when carrying a load within its
load index rating. Click here to
view the load & speed rating table.