Old 03-15-21, 10:04 PM
Jeff Wills
Insane Bicycle Mechanic
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OK... people are missing that these are 12 gauge spokes- 0.105" thick as opposed to the more common 14 gauge, .080" thick spokes. This is what Schwinn used on the Twinn tandems back then. The hub and rim are drilled to accommodate them. Using narrower spokes will result in breakage.

There are several companies selling them for E-bikes and motorized bikes. I found this with a couple minutes of Googling:
Pillar Silver Custom Cut Spokes & Nipples. 12 Gauge. E-bike Spokes. Free Shipping. – Sunny Spokes
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