Yes at that time I though the largest ring was 64 (36 + 2x14) but un fact it’s 66
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For boring winter evenings, turn the crank 100 times and let someone else watch the wheel rotating 154,5 times to verify 17/11=1,545454… is true.
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(66+36)/66 = 17/11 = 1.54545454
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I have a powerful headlamp, I can ride even during boring winter evenings. Sorry 
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