There are two main types of tyre construction - cross-ply and radial.Ĭross-ply refers to how nylon cords are constructed to cross over each other diagonally. Still unsure what tyre would suit your needs?Ĭhat to your local, friendly JAX representative to find the best tyre for you. The calculator will figure out the diameter of the rims and match it against the overall diameter to determine whether that specific size will work for your particular vehicle type and model. You can use a tyre size calculator online to help you. By doing so, you can ensure the tyre ratio remains around the same to keep your tyre driving the way manufacturers designed it to be. A good rule of thumb is to only change the aspect ratio or the tyre width and never the diameter. That said, there are many different sizes and types of tyres for modern-day vehicles, and the standard manufacturer tyre may not be best suited for your individual needs. It can cause alignment issues, unnecessary stress on the powertrains, and lead to a dip in fuel economy. Using a different aspect ratio will change the way your tyres respond to the road and will affect how much power is needed to turn. Click here for more details Other Tyre Marking examples: A tyre marked with a ‘Y’ speed rating, indicates it can be safely operated at a maximum speed of 300kph. Speed Index: The speed rating or speed index is represented by a letter and associated with the tyre’s maximum speed capability when operating at its maximum load carrying capacity.
#Tyre aspect ratio calculator code#
Load Index: The load rating, load index or load carrying capacity is represented by a numerical code and is associated with the maximum load that the tyre can carry when operating at its maximum speed rating up to but not exceeding 210kph. Rim Diameter: The tyre’s rim diameter is measured in inches taken from the wheel flange where the tyre is seated (bead seat area) to the same point on the opposite side. In the example, the height of the tyre’s sidewall is 40% of the tyre’s section width or 245 x 40% = 98mm.Ĭonstruction Code: R indicates the tyre is manufactured with a radial ply construction. The measurement distance in millimeters is from the maximum width of the tyre’s mid point of its sidewall to the same point on the opposite sidewall.Īspect Ratio: This is the height of the tyre’s sidewall expressed as a percentage of the tyre’s section width. Section Width: The tyre’s section width is measured on an ideal width of wheel, for which it has been designed to operate. Service description - Load & Speed ratings On the tyre’s sidewall there are various markings, which indicate the tyre’s dimensions and how it may be operated.ħ.
#Tyre aspect ratio calculator free#
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