Sapim nipple washers of all sorts for every wheelbuilding need. Round washers reinforce rims (9.0mm diameter, 0.5mm thick). Oval washers do the same (9.0×13.0mm oval, 0.5mm thick). Polyax washers (7.5mm diameter, 0.7mm thick) offer less reinforcement but fit all rims and are a good choice if you’re not sure what to pick. Polyax have a machined cup profile that matches Sapim Polyax nipples for low friction and improved nipple angle. MS washers (7.7mm diameter, 1.0mm thick) have a generic V-shape cup on top and a stiff, flat base only suitable for rims with flat spoke beds.
Note: spoke length must be increased by adding washer thickness. You may also build washers into spoke length calculations by adding the thickness of two washers to ERD. (Similarly if you find yourself dealing with over length spokes, rebuild with washers for some adjustment.)
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