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product image presentation

What is ERD in MTB wheels?

What is ERD?

ERD, short for Effective Rim Diameter, is the rim diameter measured at the nipple seats in the spoke holes, plus the thickness of the two nipple heads.

What is Effective Rim Diameter?.jpg

Take a 29-inch mountain bike rim as an example

Rim's height

meansure the rims height.jpg

The rim's height is 30mm, 29er mtb rimwhole diameter is 633mm

The thickness of the rim spoke hole position is 3.5mm,

So the rim ERD is 633-30-30+3.5+3.5 = 580mm

For each hub model we sell, we have the data of the spoke length, you can also contact us directly



Contact: Silver Xia

Phone: 18508262398

E-mail: carbonbike2004@gmail.com


Add: Jinyang dong Rd 1055, Magnate Light capital gatehall 5A- 4F-766, 215300 Kunshan China