ERD = Effective Rim Diameter. You need to know the ERD of a rim you're building
into a wheel (along with hub flange spacing, number of spoke holes and type of
wheel you want to build (cross 2 ("x2"), etc.)) in order to get the right spoke
length. Otherwise, you never need to know it.
BSD = Bead Seat Diameter. Wheel size, defining the tire size it takes.
Philip
www.biketinker.com
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