Genuine Wheels Manufacturing spare or a great tool on it's ownTo remove sealed bearings you will need the correct size extractor, 8mm & 10mm wrenches (for small sized extractors) or 13mm and 1-ö wrenches (for large sized extractors), hammer and punchThe correct size extractor will fit snugly into the inner diameter (I.D.) of the sealed bearing you wish to extractPlace extractor into I.D. of sealed bearing until it seats flush with the shoulder of the extractorTighten nut with wrench while securing extractor with other wrench. Tighten nut until the extractor is firmly in place within the I. D. of the sealed bearingOnce the extractor is secured, align a punch with back side of the extractorGently tap on the punch until bearing is removed along with the extractorThe bearing is now removed. Install new sealed bearings with a Wheels Mfg PRESS-1 (rear hub & bb-Æs) or PRESS-2 (front hub)