The market usually calls the wheel size for the whole motor with wheel , this motor is actually 6.5inch. you can get it from its rim diameter :166mm in above size picture. It fits with wheel marked : 12*4-6.5 / 12*4.5-6.5 , 13*5-6.5 , 14*5-6.5 .
Attention ：here is measurement for your reference for the wheel marked with 13*5-6.5
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