Sep 13, 2013 Conventional Grinders Are Mount The Wheel On Its Own Sleeve, Rough True It In The Machine, Remove The Wheel And Sleeve Assembly From The Machine, Balance The Unit, Place It Back In The Machine And Re-True The Wheel. With Newer Grinders, The Wheel Can Be Balanced In The Grinder. Dia. Weight Speed In. Lbs. Sfpm Aiken, SC 72 144,000 9,000