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Old March 10th 18, 11:55 AM posted to rec.bicycles.tech
Emanuel Berg[_2_]
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Posts: 1,035
Default rim notation

Today I saw a rear wheel rim with the
Torpedo 1SP hub. On the rim are the digits

20-635 18/8

* 20 can be the inner rim width in mm

* 635 is most likely the rim diameter and
familiar ISO/ETRTO tire designation, also
in mm

* 18 could be the number of spokes, as the rim
has 36 spokes (360 degree wheel) and 18*2=36
- but, the sprocket is 18T, so maybe that is
it?

* 8 - the sprocket diameter in cm? If so, the
"18T theory" is more likely.

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