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E.R.D.

From WikiPedalia
Sheldon Brown's Bicycle Glossary · letter E-F
← English Racer · Ergo, Ergopower ® →

Effective Rim Diameter. This is the rim diameter measured at the nipple seats in the spoke holes, plus the thickness of the two nipple heads. The E.R.D. is needed for calculating the correct spoke length.

See also the Spocalc Spoke Length Calculator on this site.

Copyright © 1996, 2008 Sheldon Brown
Original: https://www.sheldonbrown.com/gloss_e-f.html#erd · Reproduced on en.wikipedalia.com with permission, all rights reserved.
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