Neither applies when there are two options - 2 bikes = neither. You also either need to make this two sentences or put an 'and' in the middle as below. Another alternative would be to place a semi-colon at this point.
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Yunusnone of them are in good condition ( why are? why not is?)When a plural noun or pronoun follows 'none of', the verb could be either plural or singular, depending upon the context and idea involved.