Automobile Engineering in ME
The rolling resistance is because of the friction between the

None of the listed here
Wheel rim and tyre
Wheel rim and road surface
Tyre and the road surface

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Automobile Engineering in ME
In radial tyres

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

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