Patent ID: 6889549

Claim:
A method of assembling a tire and a wheel rim, comprising the steps of: (1) determining a Radial Runout (RRO) value (Wr 1 ) (unit: mm) in a primary component of the RRO of the wheel rim, a phase (θr 1 ) (unit: °) of a peak position (P) corresponding to the maximum crest portion of the primary wave form, an unbalance level (Wub) (unit: g) of a heavy point in a weight unbalance of the wheel rim, a phase (θub) (unit: °) of said unbalance level (Wub), a radial distance (L) (unit: mm) of a balance weight mounting position for correcting the weight unbalance from an axis center of the wheel rim, a weight (Tt) (unit: mm) of the tire, and a phase (αt) of a light point in the weight unbalance of the tire; (2) determining a phase (θc) of a correction unbalance (Wc) found by the following formula (1), by using the RRO value (Wr 1 ), the phase (θr 1 ), the unbalance level (Wub), the phase (θub), the distance (L), the weight (Tt) and the phase (αt) determined in the preceding step; and θ c =Tan −1 [[Wub ×Sin θ ub +{( Wr 1 × Tt )/(2 ×L )}×Sin θ r 1 ]/[ Wub ×Cos θ ub +{( Wr 1 × Tt )/(2 ×L )}×Cos θ r 1 ]] (1) (3) assembling the tire and the wheel rim in a state of aligning the phase (θc) of the correction unbalance Wc with the phase (αt) of the light point of the tire.