Automobile Engineering in ME
The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of

Wheel diameter to section width
Section height to section width
Wheel diameter to section height
Section width to section height

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Automobile Engineering in ME
In radial tyres

One ply layer runs diagonally one way and another layer runs diagonally the other way
All plies run parallel to one another and vertical to tyre bead
Inner tubes are always used
None of these

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