Seems the offset of both rims are different and adding spacers is going to affect the characteristics of the steering system.
Unless the offset are similar, otherwise it is not advisable to use them.
As to the center flange being different in size, you would need to get centering spacers, failing which the rims is not going to be seated centrally and when wheel moves in eccentric circles, it is going to cause vibrations and affect ride comfort.
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Tuesday, December 7th, 2010 AT 1:58 PM