Quote Originally Posted by m_c View Post
8mm reamer would be the way to go, or 5/16" would give 7.935mm, but that may be just too small even for a shrink fit.
If you get a shaft which is 8.000mm and a bearing, you won't get the bearing on the shaft without a decent amount of force. So I reckon 8mm reamer is good as I read somewhere you'd need 8.05mm to get a 'just slides on' fit.