Check the listing for details. BSC Tools ERD Rim Rods with Clips, 700mm, Pair. Color: Gray, Condition: New. Listed at 69.33 USD. ERD Rim Rods to calculate ERD (Effective Rim Diameter). 700mm (2 x 350mm rods), one plain rod, one with ruler markings from 700mm down to 400mm). Suitable for 700c, 650c wheels. No calculation required, just read off the ruler scale where the rods overlap. Suitable to measure straight for ERD on offset rims. Stainless steel for minimal rod flex and long life. Chamfered rod end for good fit into nipple eyelet. Includes two clips supplied so you can secure the rods together you can measure the overlap manually if it does happen to be longer than the marked ruler. BSC Tools are priced to be used as shop tools, not for resaleItem Specifications: Description, 700mm Rim Rods w/Clips, Color, Stainless, Model Name, ERD Rim Rods, Package, Pair,.