Not asking about shaft diameters, just wondering what the manufacturing tolerance is on a bearing bore. Like a bearing that has a 1" ID, would it be say -.0002/-.0001, or do they also have a plus tolerance? as just say +/-.0001? I'm gonna assume the higher end bearings are kept in the few millionths in tolerance. But just curious if they're ever on the higher side of their nominall size, or if the always try to keep it a tiny bit smaller on ID's. I tried google but only ended up with shafts fits, doesn't tell me much.