For external nipple rims, Berd recommends building with Sapim Aluminum Polyax Double Square Secure Lock nipples, which provide the following features: • 0.4 g per nipple • Requires 3.2mm square drive spoke wrench to turn. Berd recommends the Park Tool SW-15 • Allows truing from the back side of the rim. This is necessary as the tool used to prevent spoke windup makes truing difficult from the hub side of the rim. • Rim side truing also does not create cosmetic damage on visible surfaces • The head's special shape allows larger spoke angles and prevents misalignment • The Secure Lock feature prevents the possibility of nipple loosening during riding • The 16mm long body allows for more thread engagement Note - Quantities of these nipples are limited to the number of spokes on the order.
