November 04, 2018 2 Comments
To build a wheel you must measure your hub and rim to determine spoke length. The better your measurements, the more accurate the spoke length prediction. Here's a tool to make that easier.
Thanks to Adrian Emilsen I was reminded how helpful a height gauge is. I've got one you should consider—iGaging's precision digital tool. Here's one in use in Adrian's workshop in Western Australia.
The IP54 tool is a great choice. Features:
We ship it with instructions and a hub stand—a one pound slug of polished steel, 76mm diameter x 13mm depth, with a 12mm center hole. Any QR or thru axle hub will sit still so you can adjust the measuring beam.
For hub width determination, refer to the image below. First set the sliding beam on the base and press zero. Raise it to the center of the next flange (A) and note the number. Then raise to the second flange (B) and again note the number. Finally raise it to the axle end (C). Note the number.
Right hub width (center-to-flange) = C/2 - A
Left hub width (center-to-flange) = C/2 - (C-B)
Easier than fumbling with a vernier
A height gauge also assists rim measurement. Establish width, bead seat location, and hole offset.
Add a height gauge to your workshop!
November 02, 2021
When calculating the Left and Right offsets, it’s advisable to check the results, since L+R should equal B-A or just use a spreadsheet that accepts the three measured values. This check has saved me on a couple of occasions!
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November 02, 2021
What a neat tool. Years ago I had access to a Starrett Vernier height guage and a surface plate. The digital guage with variable zero is the ultimate !
I also agree with Roger above, add up your measured values to confirm they equal the over locknut dimension as a cross check.
thank you Ric !! Awesome