![]() The dropdown menu has all the rim types that we stock here at GRIN. If you are using a 3rd party rim, then usually there is no problem looking up the ERD and offset specifications from the manufacturer or measuring them yourself. Nominal Diameter: This is just the nominal bike wheel size (26", 24", 700c etc).There is also comprehensive table of rim data at the FreeSpoke website. ERD: This is the most essential measurement for determining the spoke length required for a particular rim.It is only used for drawing purposes, and does not affect the spoke length calculations. It is the diameter from where the very end of the spoke should sit in the laced up wheel. Generally speaking that is at the back of where the nipple fits in the rim. YPedal had a decent photo page illustrating how to measure rim ERD yourself. Left Offset: This is the distance from the center of the rim to the left side spoke holes. ![]() If the rim holes are all in a row, then it would be left at 0mm Right Offset: This it the distance from the center of the rim to the right side spoke holes. ![]() If the rim holes are not staggered, then it should be left at 0mm.
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