"centre bore" - its the size of the centre hole in the rim (the big hole in the middle) which relates to the size of the rim on the hub it slots over when you put your wheels on they should match, that way the wheel lines itself up perfectly when you bolt it on
just for shits and giggles, the X-factor relates to the clearance from the back of the spokes to the back edge of the wheel at the centre. ie. the room you have to fit brakes in there!
just for shits and giggles, the X-factor relates to the clearance from the back of the spokes to the back edge of the wheel at the centre. ie. the room you have to fit brakes in there!
you know what that means right? the distance from the back edge of the wheel where it bolts to the hub (that'd be the flat surface with holes in it) to the back of the spokes... ie. the gap between the hub and the spokes... ie. the space you have to fit brakes in