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27" Sun CR18 rim -- ERD?

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27" Sun CR18 rim -- ERD?

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Old 11-06-04, 06:00 PM
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27" Sun CR18 rim -- ERD?

Does anyone know the effective rim diameter of a 27" Sun CR18 rim? Can't seem to find it anywhere. Thanks.
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Old 11-06-04, 09:34 PM
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618mm.
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Old 11-07-04, 08:44 AM
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Thank you!
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Old 03-18-08, 08:44 AM
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This is an old thread, I know, but the title is perfect and easily found in a search, so I thought I'd add this here as a matter of record.
There is conflicting information on the web about the 27" CR18 ERD ranging from 615-630. I called Sun and according to them its 620mm.

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Old 03-18-08, 11:46 AM
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A 27" rim should be 630.
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Old 03-18-08, 12:32 PM
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He was looking for ERD not bead seat diameter so 620 is correct. ERD is where the spokes sit not where the tires sits (BSD). Roger
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Old 03-19-08, 08:12 AM
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Thanks for clarifying that Roger.

ERD = effective rim diameter. Its has nothing to do with tire size and has everything to do with determining spoke length.
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