I want to change my wheels on my x-fire7 sp. Would Polaris 6.375 inches OD x 20mm ID wheels work? I know the stock rear wheels are 6.38 , 5/8 BORE X 2" insert, with 25M bearing.

Now would i be able to remove the polaris bearing and replace it with my cat bearing? Is the 20mm and 25mm the inside diameters of the bearings? or the outside?

Thanks